SpringBoot(十)----SpringMVC自动配置&扩展配置
1.SpringMVC自动配置
SpringBoot 为我们定义好了SpringMVC的配置文件(org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration.class)，首先我们来参考一下官网的SpringMVC的自动配置的介绍。
官网上介绍SpringMVC自动配置是如下这么介绍的：
他具体说了哪些内容？
1.包括了ContentNegotiatingViewResolver和BeanNameViewResolver这两个bean。
我们可以看一下这两个Bean的源码，在包org.springframework.web.servlet.view(ContentNegotiatingViewResolver)和org.springframework.web.servlet.view(BeanNameViewResolver)下。
自动配置了ViewResolver(视图解析器：根据方法的返回值得到了视图对象（View），视图对象决定如何渲染（转发/重定向界面）)
WebMvcAutoConfiguration.java类中
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528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 | //// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package org.springframework.boot.autoconfigure.web.servlet;import java.time.Duration;import java.util.Arrays;import java.util.Iterator;import java.util.List;import java.util.ListIterator;import java.util.Map;import java.util.Optional;import java.util.stream.Stream;import javax.servlet.Servlet;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.ListableBeanFactory;import org.springframework.beans.factory.NoSuchBeanDefinitionException;import org.springframework.beans.factory.ObjectProvider;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.boot.autoconfigure.AutoConfigureAfter;import org.springframework.boot.autoconfigure.AutoConfigureOrder;import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;import org.springframework.boot.autoconfigure.http.HttpMessageConverters;import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProviders;import org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration;import org.springframework.boot.autoconfigure.validation.ValidatorAdapter;import org.springframework.boot.autoconfigure.web.ConditionalOnEnabledResourceChain;import org.springframework.boot.autoconfigure.web.ResourceProperties;import org.springframework.boot.autoconfigure.web.ResourceProperties.Chain;import org.springframework.boot.autoconfigure.web.ResourceProperties.Strategy;import org.springframework.boot.autoconfigure.web.format.DateTimeFormatters;import org.springframework.boot.autoconfigure.web.format.WebConversionService;import org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.Contentnegotiation;import org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.Format;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.boot.convert.ApplicationConversionService;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.boot.web.servlet.filter.OrderedFormContentFilter;import org.springframework.boot.web.servlet.filter.OrderedHiddenHttpMethodFilter;import org.springframework.boot.web.servlet.filter.OrderedRequestContextFilter;import org.springframework.context.ApplicationContext;import org.springframework.context.ResourceLoaderAware;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Import;import org.springframework.context.annotation.Primary;import org.springframework.core.annotation.Order;import org.springframework.core.io.Resource;import org.springframework.core.io.ResourceLoader;import org.springframework.core.task.AsyncTaskExecutor;import org.springframework.format.FormatterRegistry;import org.springframework.format.support.FormattingConversionService;import org.springframework.http.CacheControl;import org.springframework.http.MediaType;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.util.ClassUtils;import org.springframework.validation.DefaultMessageCodesResolver;import org.springframework.validation.MessageCodesResolver;import org.springframework.validation.Validator;import org.springframework.web.HttpMediaTypeNotAcceptableException;import org.springframework.web.accept.ContentNegotiationManager;import org.springframework.web.accept.ContentNegotiationStrategy;import org.springframework.web.accept.PathExtensionContentNegotiationStrategy;import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;import org.springframework.web.context.request.NativeWebRequest;import org.springframework.web.context.request.RequestContextListener;import org.springframework.web.filter.FormContentFilter;import org.springframework.web.filter.HiddenHttpMethodFilter;import org.springframework.web.filter.RequestContextFilter;import org.springframework.web.servlet.DispatcherServlet;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.LocaleResolver;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;import org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration;import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;import org.springframework.web.servlet.config.annotation.ResourceChainRegistration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver;import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;import org.springframework.web.servlet.i18n.FixedLocaleResolver;import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;import org.springframework.web.servlet.resource.AppCacheManifestTransformer;import org.springframework.web.servlet.resource.EncodedResourceResolver;import org.springframework.web.servlet.resource.ResourceResolver;import org.springframework.web.servlet.resource.ResourceUrlProvider;import org.springframework.web.servlet.resource.VersionResourceResolver;import org.springframework.web.servlet.view.BeanNameViewResolver;import org.springframework.web.servlet.view.ContentNegotiatingViewResolver;import org.springframework.web.servlet.view.InternalResourceViewResolver;import org.springframework.web.util.UrlPathHelper;@Configuration( proxyBeanMethods = false)@ConditionalOnWebApplication( type = Type.SERVLET)@ConditionalOnClass({Servlet.class, DispatcherServlet.class, WebMvcConfigurer.class})@ConditionalOnMissingBean({WebMvcConfigurationSupport.class})@AutoConfigureOrder(-2147483638)@AutoConfigureAfter({DispatcherServletAutoConfiguration.class, TaskExecutionAutoConfiguration.class, ValidationAutoConfiguration.class})public class WebMvcAutoConfiguration { public static final String DEFAULT_PREFIX = ""; public static final String DEFAULT_SUFFIX = ""; private static final String[] SERVLET_LOCATIONS = new String[]{"/"}; public WebMvcAutoConfiguration() { } @Bean @ConditionalOnMissingBean({HiddenHttpMethodFilter.class}) @ConditionalOnProperty( prefix = "spring.mvc.hiddenmethod.filter", name = {"enabled"}, matchIfMissing = false ) public OrderedHiddenHttpMethodFilter hiddenHttpMethodFilter() { return new OrderedHiddenHttpMethodFilter(); } @Bean @ConditionalOnMissingBean({FormContentFilter.class}) @ConditionalOnProperty( prefix = "spring.mvc.formcontent.filter", name = {"enabled"}, matchIfMissing = true ) public OrderedFormContentFilter formContentFilter() { return new OrderedFormContentFilter(); } static String[] getResourceLocations(String[] staticLocations) { String[] locations = new String[staticLocations.length + SERVLET_LOCATIONS.length]; System.arraycopy(staticLocations, 0, locations, 0, staticLocations.length); System.arraycopy(SERVLET_LOCATIONS, 0, locations, staticLocations.length, SERVLET_LOCATIONS.length); return locations; } static class OptionalPathExtensionContentNegotiationStrategy implements ContentNegotiationStrategy { private static final String SKIP_ATTRIBUTE = PathExtensionContentNegotiationStrategy.class.getName() + ".SKIP"; private final ContentNegotiationStrategy delegate; OptionalPathExtensionContentNegotiationStrategy(ContentNegotiationStrategy delegate) { this.delegate = delegate; } public List<MediaType> resolveMediaTypes(NativeWebRequest webRequest) throws HttpMediaTypeNotAcceptableException { Object skip = webRequest.getAttribute(SKIP_ATTRIBUTE, 0); return skip != null && Boolean.parseBoolean(skip.toString()) ? MEDIA_TYPE_ALL_LIST : this.delegate.resolveMediaTypes(webRequest); } } static class ResourceChainResourceHandlerRegistrationCustomizer implements WebMvcAutoConfiguration.ResourceHandlerRegistrationCustomizer { @Autowired private ResourceProperties resourceProperties = new ResourceProperties(); ResourceChainResourceHandlerRegistrationCustomizer() { } public void customize(ResourceHandlerRegistration registration) { Chain properties = this.resourceProperties.getChain(); this.configureResourceChain(properties, registration.resourceChain(properties.isCache())); } private void configureResourceChain(Chain properties, ResourceChainRegistration chain) { Strategy strategy = properties.getStrategy(); if (properties.isCompressed()) { chain.addResolver(new EncodedResourceResolver()); } if (strategy.getFixed().isEnabled() || strategy.getContent().isEnabled()) { chain.addResolver(this.getVersionResourceResolver(strategy)); } if (properties.isHtmlApplicationCache()) { chain.addTransformer(new AppCacheManifestTransformer()); } } private ResourceResolver getVersionResourceResolver(Strategy properties) { VersionResourceResolver resolver = new VersionResourceResolver(); if (properties.getFixed().isEnabled()) { String version = properties.getFixed().getVersion(); String[] paths = properties.getFixed().getPaths(); resolver.addFixedVersionStrategy(version, paths); } if (properties.getContent().isEnabled()) { String[] paths = properties.getContent().getPaths(); resolver.addContentVersionStrategy(paths); } return resolver; } } interface ResourceHandlerRegistrationCustomizer { void customize(ResourceHandlerRegistration registration); } @Configuration( proxyBeanMethods = false ) @ConditionalOnEnabledResourceChain static class ResourceChainCustomizerConfiguration { ResourceChainCustomizerConfiguration() { } @Bean WebMvcAutoConfiguration.ResourceChainResourceHandlerRegistrationCustomizer resourceHandlerRegistrationCustomizer() { return new WebMvcAutoConfiguration.ResourceChainResourceHandlerRegistrationCustomizer(); } } @Configuration( proxyBeanMethods = false ) public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration implements ResourceLoaderAware { private final ResourceProperties resourceProperties; private final WebMvcProperties mvcProperties; private final ListableBeanFactory beanFactory; private final WebMvcRegistrations mvcRegistrations; private ResourceLoader resourceLoader; public EnableWebMvcConfiguration(ResourceProperties resourceProperties, ObjectProvider<WebMvcProperties> mvcPropertiesProvider, ObjectProvider<WebMvcRegistrations> mvcRegistrationsProvider, ListableBeanFactory beanFactory) { this.resourceProperties = resourceProperties; this.mvcProperties = (WebMvcProperties)mvcPropertiesProvider.getIfAvailable(); this.mvcRegistrations = (WebMvcRegistrations)mvcRegistrationsProvider.getIfUnique(); this.beanFactory = beanFactory; } @Bean public RequestMappingHandlerAdapter requestMappingHandlerAdapter(@Qualifier("mvcContentNegotiationManager") ContentNegotiationManager contentNegotiationManager, @Qualifier("mvcConversionService") FormattingConversionService conversionService, @Qualifier("mvcValidator") Validator validator) { RequestMappingHandlerAdapter adapter = super.requestMappingHandlerAdapter(contentNegotiationManager, conversionService, validator); adapter.setIgnoreDefaultModelOnRedirect(this.mvcProperties == null || this.mvcProperties.isIgnoreDefaultModelOnRedirect()); return adapter; } protected RequestMappingHandlerAdapter createRequestMappingHandlerAdapter() { if (this.mvcRegistrations != null) { RequestMappingHandlerAdapter adapter = this.mvcRegistrations.getRequestMappingHandlerAdapter(); if (adapter != null) { return adapter; } } return super.createRequestMappingHandlerAdapter(); } @Bean @Primary public RequestMappingHandlerMapping requestMappingHandlerMapping(@Qualifier("mvcContentNegotiationManager") ContentNegotiationManager contentNegotiationManager, @Qualifier("mvcConversionService") FormattingConversionService conversionService, @Qualifier("mvcResourceUrlProvider") ResourceUrlProvider resourceUrlProvider) { return super.requestMappingHandlerMapping(contentNegotiationManager, conversionService, resourceUrlProvider); } @Bean public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) { WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern()); welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider)); welcomePageHandlerMapping.setCorsConfigurations(this.getCorsConfigurations()); return welcomePageHandlerMapping; } private Optional<Resource> getWelcomePage() { String[] locations = WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations()); return Arrays.stream(locations).map(this::getIndexHtml).filter(this::isReadable).findFirst(); } private Resource getIndexHtml(String location) { return this.resourceLoader.getResource(location + "index.html"); } private boolean isReadable(Resource resource) { try { return resource.exists() && resource.getURL() != null; } catch (Exception var3) { return false; } } @Bean public FormattingConversionService mvcConversionService() { Format format = this.mvcProperties.getFormat(); WebConversionService conversionService = new WebConversionService((new DateTimeFormatters()).dateFormat(format.getDate()).timeFormat(format.getTime()).dateTimeFormat(format.getDateTime())); this.addFormatters(conversionService); return conversionService; } @Bean public Validator mvcValidator() { return !ClassUtils.isPresent("javax.validation.Validator", this.getClass().getClassLoader()) ? super.mvcValidator() : ValidatorAdapter.get(this.getApplicationContext(), this.getValidator()); } protected RequestMappingHandlerMapping createRequestMappingHandlerMapping() { if (this.mvcRegistrations != null) { RequestMappingHandlerMapping mapping = this.mvcRegistrations.getRequestMappingHandlerMapping(); if (mapping != null) { return mapping; } } return super.createRequestMappingHandlerMapping(); } protected ConfigurableWebBindingInitializer getConfigurableWebBindingInitializer(FormattingConversionService mvcConversionService, Validator mvcValidator) { try { return (ConfigurableWebBindingInitializer)this.beanFactory.getBean(ConfigurableWebBindingInitializer.class); } catch (NoSuchBeanDefinitionException var4) { return super.getConfigurableWebBindingInitializer(mvcConversionService, mvcValidator); } } protected ExceptionHandlerExceptionResolver createExceptionHandlerExceptionResolver() { if (this.mvcRegistrations != null) { ExceptionHandlerExceptionResolver resolver = this.mvcRegistrations.getExceptionHandlerExceptionResolver(); if (resolver != null) { return resolver; } } return super.createExceptionHandlerExceptionResolver(); } protected void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) { super.extendHandlerExceptionResolvers(exceptionResolvers); if (this.mvcProperties.isLogResolvedException()) { Iterator var2 = exceptionResolvers.iterator(); while(var2.hasNext()) { HandlerExceptionResolver resolver = (HandlerExceptionResolver)var2.next(); if (resolver instanceof AbstractHandlerExceptionResolver) { ((AbstractHandlerExceptionResolver)resolver).setWarnLogCategory(resolver.getClass().getName()); } } } } @Bean public ContentNegotiationManager mvcContentNegotiationManager() { ContentNegotiationManager manager = super.mvcContentNegotiationManager(); List<ContentNegotiationStrategy> strategies = manager.getStrategies(); ListIterator iterator = strategies.listIterator(); while(iterator.hasNext()) { ContentNegotiationStrategy strategy = (ContentNegotiationStrategy)iterator.next(); if (strategy instanceof PathExtensionContentNegotiationStrategy) { iterator.set(new WebMvcAutoConfiguration.OptionalPathExtensionContentNegotiationStrategy(strategy)); } } return manager; } public void setResourceLoader(ResourceLoader resourceLoader) { this.resourceLoader = resourceLoader; } } @Configuration( proxyBeanMethods = false ) @Import({WebMvcAutoConfiguration.EnableWebMvcConfiguration.class}) @EnableConfigurationProperties({WebMvcProperties.class, ResourceProperties.class}) @Order(0) public static class WebMvcAutoConfigurationAdapter implements WebMvcConfigurer { private static final Log logger = LogFactory.getLog(WebMvcConfigurer.class); private final ResourceProperties resourceProperties; private final WebMvcProperties mvcProperties; private final ListableBeanFactory beanFactory; private final ObjectProvider<HttpMessageConverters> messageConvertersProvider; private final ObjectProvider<DispatcherServletPath> dispatcherServletPath; private final ObjectProvider<ServletRegistrationBean<?>> servletRegistrations; final WebMvcAutoConfiguration.ResourceHandlerRegistrationCustomizer resourceHandlerRegistrationCustomizer; public WebMvcAutoConfigurationAdapter(ResourceProperties resourceProperties, WebMvcProperties mvcProperties, ListableBeanFactory beanFactory, ObjectProvider<HttpMessageConverters> messageConvertersProvider, ObjectProvider<WebMvcAutoConfiguration.ResourceHandlerRegistrationCustomizer> resourceHandlerRegistrationCustomizerProvider, ObjectProvider<DispatcherServletPath> dispatcherServletPath, ObjectProvider<ServletRegistrationBean<?>> servletRegistrations) { this.resourceProperties = resourceProperties; this.mvcProperties = mvcProperties; this.beanFactory = beanFactory; this.messageConvertersProvider = messageConvertersProvider; this.resourceHandlerRegistrationCustomizer = (WebMvcAutoConfiguration.ResourceHandlerRegistrationCustomizer)resourceHandlerRegistrationCustomizerProvider.getIfAvailable(); this.dispatcherServletPath = dispatcherServletPath; this.servletRegistrations = servletRegistrations; } public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { this.messageConvertersProvider.ifAvailable((customConverters) -> { converters.addAll(customConverters.getConverters()); }); } public void configureAsyncSupport(AsyncSupportConfigurer configurer) { if (this.beanFactory.containsBean("applicationTaskExecutor")) { Object taskExecutor = this.beanFactory.getBean("applicationTaskExecutor"); if (taskExecutor instanceof AsyncTaskExecutor) { configurer.setTaskExecutor((AsyncTaskExecutor)taskExecutor); } } Duration timeout = this.mvcProperties.getAsync().getRequestTimeout(); if (timeout != null) { configurer.setDefaultTimeout(timeout.toMillis()); } } public void configurePathMatch(PathMatchConfigurer configurer) { configurer.setUseSuffixPatternMatch(this.mvcProperties.getPathmatch().isUseSuffixPattern()); configurer.setUseRegisteredSuffixPatternMatch(this.mvcProperties.getPathmatch().isUseRegisteredSuffixPattern()); this.dispatcherServletPath.ifAvailable((dispatcherPath) -> { String servletUrlMapping = dispatcherPath.getServletUrlMapping(); if (servletUrlMapping.equals("/") && this.singleDispatcherServlet()) { UrlPathHelper urlPathHelper = new UrlPathHelper(); urlPathHelper.setAlwaysUseFullPath(true); configurer.setUrlPathHelper(urlPathHelper); } }); } private boolean singleDispatcherServlet() { Stream var10000 = this.servletRegistrations.stream().map(ServletRegistrationBean::getServlet); DispatcherServlet.class.getClass(); return var10000.filter(DispatcherServlet.class::isInstance).count() == 1L; } public void configureContentNegotiation(ContentNegotiationConfigurer configurer) { Contentnegotiation contentnegotiation = this.mvcProperties.getContentnegotiation(); configurer.favorPathExtension(contentnegotiation.isFavorPathExtension()); configurer.favorParameter(contentnegotiation.isFavorParameter()); if (contentnegotiation.getParameterName() != null) { configurer.parameterName(contentnegotiation.getParameterName()); } Map<String, MediaType> mediaTypes = this.mvcProperties.getContentnegotiation().getMediaTypes(); mediaTypes.forEach(configurer::mediaType); } @Bean @ConditionalOnMissingBean public InternalResourceViewResolver defaultViewResolver() { InternalResourceViewResolver resolver = new InternalResourceViewResolver(); resolver.setPrefix(this.mvcProperties.getView().getPrefix()); resolver.setSuffix(this.mvcProperties.getView().getSuffix()); return resolver; } @Bean @ConditionalOnBean({View.class}) @ConditionalOnMissingBean public BeanNameViewResolver beanNameViewResolver() { BeanNameViewResolver resolver = new BeanNameViewResolver(); resolver.setOrder(2147483637); return resolver; } @Bean @ConditionalOnBean({ViewResolver.class}) @ConditionalOnMissingBean( name = {"viewResolver"}, value = {ContentNegotiatingViewResolver.class} ) public ContentNegotiatingViewResolver viewResolver(BeanFactory beanFactory) { ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver(); resolver.setContentNegotiationManager((ContentNegotiationManager)beanFactory.getBean(ContentNegotiationManager.class)); resolver.setOrder(-2147483648); return resolver; } @Bean @ConditionalOnMissingBean @ConditionalOnProperty( prefix = "spring.mvc", name = {"locale"} ) public LocaleResolver localeResolver() { if (this.mvcProperties.getLocaleResolver() == org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.LocaleResolver.FIXED) { return new FixedLocaleResolver(this.mvcProperties.getLocale()); } else { AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver(); localeResolver.setDefaultLocale(this.mvcProperties.getLocale()); return localeResolver; } } public MessageCodesResolver getMessageCodesResolver() { if (this.mvcProperties.getMessageCodesResolverFormat() != null) { DefaultMessageCodesResolver resolver = new DefaultMessageCodesResolver(); resolver.setMessageCodeFormatter(this.mvcProperties.getMessageCodesResolverFormat()); return resolver; } else { return null; } } public void addFormatters(FormatterRegistry registry) { ApplicationConversionService.addBeans(registry, this.beanFactory); } public void addResourceHandlers(ResourceHandlerRegistry registry) { if (!this.resourceProperties.isAddMappings()) { logger.debug("Default resource handling disabled"); } else { Duration cachePeriod = this.resourceProperties.getCache().getPeriod(); CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl(); if (!registry.hasMappingForPattern("/webjars/**")) { this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl)); } String staticPathPattern = this.mvcProperties.getStaticPathPattern(); if (!registry.hasMappingForPattern(staticPathPattern)) { this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl)); } } } private Integer getSeconds(Duration cachePeriod) { return cachePeriod != null ? (int)cachePeriod.getSeconds() : null; } private void customizeResourceHandlerRegistration(ResourceHandlerRegistration registration) { if (this.resourceHandlerRegistrationCustomizer != null) { this.resourceHandlerRegistrationCustomizer.customize(registration); } } @Bean @ConditionalOnMissingBean({RequestContextListener.class, RequestContextFilter.class}) @ConditionalOnMissingFilterBean({RequestContextFilter.class}) public static RequestContextFilter requestContextFilter() { return new OrderedRequestContextFilter(); } }} |
在ContentNegotiatingViewResolver.java中有这么一段代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | @Overrideprotected void initServletContext(ServletContext servletContext) { Collection<ViewResolver> matchingBeans = BeanFactoryUtils.beansOfTypeIncludingAncestors(getApplicationContext(), ViewResolver.class).values(); if (this.viewResolvers == null) { this.viewResolvers = new ArrayList<ViewResolver>(matchingBeans.size()); for (ViewResolver viewResolver : matchingBeans) { if (this != viewResolver) { this.viewResolvers.add(viewResolver); } } } else { for (int i = 0; i < viewResolvers.size(); i++) { if (matchingBeans.contains(viewResolvers.get(i))) { continue; } String name = viewResolvers.get(i).getClass().getName() + i; getApplicationContext().getAutowireCapableBeanFactory().initializeBean(viewResolvers.get(i), name); } } if (this.viewResolvers.isEmpty()) { logger.warn("Did not find any ViewResolvers to delegate to; please configure them using the " + "'viewResolvers' property on the ContentNegotiatingViewResolver"); } AnnotationAwareOrderComparator.sort(this.viewResolvers); this.cnmFactoryBean.setServletContext(servletContext); } |
initServletContext的类的作用是使用BeanFactory工具获取所有的视图解析器，所以这个类的作用就是组合所有的视图解析器，自动配置ViewResovler(视图解析器作用，根据方法返回值得到视图对象view)
在此文件中，可以看到resolveViewName方法，里面代码是从this.viewResolvers获取候选的视图解析器，遍历容器里所有视图，然后通过如图所标记的获取候选视图对象，获取候选的视图列表，再通过getBestView获取最合适的视图对象--------ContentNegotiatingViewResolver类的主要作用。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | @Overridepublic View resolveViewName(String viewName, Locale locale) throws Exception { RequestAttributes attrs = RequestContextHolder.getRequestAttributes(); Assert.isInstanceOf(ServletRequestAttributes.class, attrs); List<MediaType> requestedMediaTypes = getMediaTypes(((ServletRequestAttributes) attrs).getRequest()); if (requestedMediaTypes != null) { List<View> candidateViews = getCandidateViews(viewName, locale, requestedMediaTypes); View bestView = getBestView(candidateViews, requestedMediaTypes, attrs); if (bestView != null) { return bestView; } } if (this.useNotAcceptableStatusCode) { if (logger.isDebugEnabled()) { logger.debug("No acceptable view found; returning 406 (Not Acceptable) status code"); } return NOT_ACCEPTABLE_VIEW; } else { logger.debug("No acceptable view found; returning null"); return null; } } |
遍历所有的视图解析器对象，从视图解析器里获取候选的视图，封装成list保存
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | private List<View> getCandidateViews(String viewName, Locale locale, List<MediaType> requestedMediaTypes) throws Exception { List<View> candidateViews = new ArrayList<View>(); for (ViewResolver viewResolver : this.viewResolvers) { View view = viewResolver.resolveViewName(viewName, locale); if (view != null) { candidateViews.add(view); } for (MediaType requestedMediaType : requestedMediaTypes) { List<String> extensions = this.contentNegotiationManager.resolveFileExtensions(requestedMediaType); for (String extension : extensions) { String viewNameWithExtension = viewName + '.' + extension; view = viewResolver.resolveViewName(viewNameWithExtension, locale); if (view != null) { candidateViews.add(view); } } } } if (!CollectionUtils.isEmpty(this.defaultViews)) { candidateViews.addAll(this.defaultViews); } return candidateViews; } |
我们只需要将视图解析器丢到Spring容器里，就可以加载到。
添加视图解析器。
DemoApplication.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | package com.example.demo;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Bean;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import java.util.Locale;@SpringBootApplicationpublic class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } @Bean public ViewResolver myViewResolver(){ return new myViewResolver(); } public static class myViewResolver implements ViewResolver{ @Override public View resolveViewName(String s, Locale locale) throws Exception { return null; } }} |
DispatcherServlet(org.springframework.web.servlet.DispatcherServlet.class)是Spring核心分发器，找到doDispatch方法，在doDispatch方法上打断点，可以看到加的视图解析器加载到了。
2.支持服务静态资源，包括支持WebJars。
这个具体怎么支持，我们在之前的博客中已经说明了，具体几个添加静态资源的路径。
3.自动注册Converter， GenericConverter，和 Formatter bean。
Converter：转换器，public String hello(User user)：类型转换使用Converter
Formatter：格式化器；2017/12/17=====2017.12.17
看一下这三个转换器的声明：Converter.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | /* * Copyright 2002-2015 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.core.convert.converter;/** * A converter converts a source object of type {@code S} to a target of type {@code T}. * * <p>Implementations of this interface are thread-safe and can be shared. * * <p>Implementations may additionally implement {@link ConditionalConverter}. * * @author Keith Donald * @since 3.0 * @param <S> the source type * @param <T> the target type */public interface Converter<S, T> { /** * Convert the source object of type {@code S} to target type {@code T}. * @param source the source object to convert, which must be an instance of {@code S} (never {@code null}) * @return the converted object, which must be an instance of {@code T} (potentially {@code null}) * @throws IllegalArgumentException if the source cannot be converted to the desired target type */ T convert(S source);} |
GenericConverter.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | /* * Copyright 2002-2015 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.core.convert.converter;import java.util.Set;import org.springframework.core.convert.TypeDescriptor;import org.springframework.util.Assert;/** * Generic converter interface for converting between two or more types. * * <p>This is the most flexible of the Converter SPI interfaces, but also the most complex. * It is flexible in that a GenericConverter may support converting between multiple source/target * type pairs (see {@link #getConvertibleTypes()}. In addition, GenericConverter implementations * have access to source/target {@link TypeDescriptor field context} during the type conversion * process. This allows for resolving source and target field metadata such as annotations and * generics information, which can be used to influence the conversion logic. * * <p>This interface should generally not be used when the simpler {@link Converter} or * {@link ConverterFactory} interface is sufficient. * * <p>Implementations may additionally implement {@link ConditionalConverter}. * * @author Keith Donald * @author Juergen Hoeller * @since 3.0 * @see TypeDescriptor * @see Converter * @see ConverterFactory * @see ConditionalConverter */public interface GenericConverter { /** * Return the source and target types that this converter can convert between. * <p>Each entry is a convertible source-to-target type pair. * <p>For {@link ConditionalConverter conditional converters} this method may return * {@code null} to indicate all source-to-target pairs should be considered. */ Set<ConvertiblePair> getConvertibleTypes(); /** * Convert the source object to the targetType described by the {@code TypeDescriptor}. * @param source the source object to convert (may be {@code null}) * @param sourceType the type descriptor of the field we are converting from * @param targetType the type descriptor of the field we are converting to * @return the converted object */ Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType); /** * Holder for a source-to-target class pair. */ final class ConvertiblePair { private final Class<?> sourceType; private final Class<?> targetType; /** * Create a new source-to-target pair. * @param sourceType the source type * @param targetType the target type */ public ConvertiblePair(Class<?> sourceType, Class<?> targetType) { Assert.notNull(sourceType, "Source type must not be null"); Assert.notNull(targetType, "Target type must not be null"); this.sourceType = sourceType; this.targetType = targetType; } public Class<?> getSourceType() { return this.sourceType; } public Class<?> getTargetType() { return this.targetType; } @Override public boolean equals(Object other) { if (this == other) { return true; } if (other == null || other.getClass() != ConvertiblePair.class) { return false; } ConvertiblePair otherPair = (ConvertiblePair) other; return (this.sourceType == otherPair.sourceType && this.targetType == otherPair.targetType); } @Override public int hashCode() { return (this.sourceType.hashCode() * 31 + this.targetType.hashCode()); } @Override public String toString() { return (this.sourceType.getName() + " -> " + this.targetType.getName()); } }} |
Formatter.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | /* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.format;/** * Formats objects of type T. * A Formatter is both a Printer <i>and</i> a Parser for an object type. * * @author Keith Donald * @since 3.0 * @param <T> the type of object this Formatter formats */public interface Formatter<T> extends Printer<T>, Parser<T> {} |
这是三个格式转换器的声明，主要作用是类型间的转换。
4.支持httpMessageConverter。
这个类是SpringMVC用来转换Http请求和响应的；HttpMessageConverters 是从容器中确定的；获取所有的HttpMessageConverter；如果想自定义给容器中添加HttpMessageConverter，只需要将自己的组件注册容器中就可以了（怎么注册:用@Bean,@Component）
HttpMessageConverters.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 | /* * Copyright 2012-2015 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.boot.autoconfigure.web;import java.lang.reflect.Field;import java.util.ArrayList;import java.util.Arrays;import java.util.Collection;import java.util.Collections;import java.util.Iterator;import java.util.List;import org.springframework.http.converter.FormHttpMessageConverter;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;import org.springframework.http.converter.xml.AbstractXmlHttpMessageConverter;import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;import org.springframework.util.ClassUtils;import org.springframework.util.ReflectionUtils;import org.springframework.web.client.RestTemplate;import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;/** * Bean used to manage the {@link HttpMessageConverter}s used in a Spring Boot * application. Provides a convenient way to add and merge additional * {@link HttpMessageConverter}s to a web application. * <p> * An instance of this bean can be registered with specific * {@link #HttpMessageConverters(HttpMessageConverter...) additional converters} if * needed, otherwise default converters will be used. * <p> * NOTE: The default converters used are the same as standard Spring MVC (see * {@link WebMvcConfigurationSupport#getMessageConverters} with some slight re-ordering to * put XML converters at the back of the list. * * @author Dave Syer * @author Phillip Webb * @author Andy Wilkinson * @see #HttpMessageConverters(HttpMessageConverter...) * @see #HttpMessageConverters(Collection) * @see #getConverters() */public class HttpMessageConverters implements Iterable<HttpMessageConverter<?>> { private static final List<Class<?>> NON_REPLACING_CONVERTERS; static { List<Class<?>> nonReplacingConverters = new ArrayList<Class<?>>(); addClassIfExists(nonReplacingConverters, "org.springframework.hateoas.mvc." + "TypeConstrainedMappingJackson2HttpMessageConverter"); NON_REPLACING_CONVERTERS = Collections.unmodifiableList(nonReplacingConverters); } private final List<HttpMessageConverter<?>> converters; /** * Create a new {@link HttpMessageConverters} instance with the specified additional * converters. * @param additionalConverters additional converters to be added. New converters will * be added to the front of the list, overrides will replace existing items without * changing the order. The {@link #getConverters()} methods can be used for further * converter manipulation. */ public HttpMessageConverters(HttpMessageConverter<?>... additionalConverters) { this(Arrays.asList(additionalConverters)); } /** * Create a new {@link HttpMessageConverters} instance with the specified additional * converters. * @param additionalConverters additional converters to be added. Items are added just * before any default converter of the same type (or at the front of the list if no * default converter is found) The {@link #postProcessConverters(List)} method can be * used for further converter manipulation. */ public HttpMessageConverters( Collection<HttpMessageConverter<?>> additionalConverters) { this(true, additionalConverters); } /** * Create a new {@link HttpMessageConverters} instance with the specified converters. * @param addDefaultConverters if default converters should be added * @param converters converters to be added. Items are added just before any default * converter of the same type (or at the front of the list if no default converter is * found) The {@link #postProcessConverters(List)} method can be used for further * converter manipulation. */ public HttpMessageConverters(boolean addDefaultConverters, Collection<HttpMessageConverter<?>> converters) { List<HttpMessageConverter<?>> combined = getCombinedConverters(converters, addDefaultConverters ? getDefaultConverters() : Collections.<HttpMessageConverter<?>>emptyList()); combined = postProcessConverters(combined); this.converters = Collections.unmodifiableList(combined); } private List<HttpMessageConverter<?>> getCombinedConverters( Collection<HttpMessageConverter<?>> converters, List<HttpMessageConverter<?>> defaultConverters) { List<HttpMessageConverter<?>> combined = new ArrayList<HttpMessageConverter<?>>(); List<HttpMessageConverter<?>> processing = new ArrayList<HttpMessageConverter<?>>( converters); for (HttpMessageConverter<?> defaultConverter : defaultConverters) { Iterator<HttpMessageConverter<?>> iterator = processing.iterator(); while (iterator.hasNext()) { HttpMessageConverter<?> candidate = iterator.next(); if (isReplacement(defaultConverter, candidate)) { combined.add(candidate); iterator.remove(); } } combined.add(defaultConverter); if (defaultConverter instanceof AllEncompassingFormHttpMessageConverter) { configurePartConverters( (AllEncompassingFormHttpMessageConverter) defaultConverter, converters); } } combined.addAll(0, processing); return combined; } private boolean isReplacement(HttpMessageConverter<?> defaultConverter, HttpMessageConverter<?> candidate) { for (Class<?> nonReplacingConverter : NON_REPLACING_CONVERTERS) { if (nonReplacingConverter.isInstance(candidate)) { return false; } } return ClassUtils.isAssignableValue(defaultConverter.getClass(), candidate); } private void configurePartConverters( AllEncompassingFormHttpMessageConverter formConverter, Collection<HttpMessageConverter<?>> converters) { List<HttpMessageConverter<?>> partConverters = extractPartConverters( formConverter); List<HttpMessageConverter<?>> combinedConverters = getCombinedConverters( converters, partConverters); combinedConverters = postProcessPartConverters(combinedConverters); formConverter.setPartConverters(combinedConverters); } @SuppressWarnings("unchecked") private List<HttpMessageConverter<?>> extractPartConverters( FormHttpMessageConverter formConverter) { Field field = ReflectionUtils.findField(FormHttpMessageConverter.class, "partConverters"); ReflectionUtils.makeAccessible(field); return (List<HttpMessageConverter<?>>) ReflectionUtils.getField(field, formConverter); } /** * Method that can be used to post-process the {@link HttpMessageConverter} list * before it is used. * @param converters a mutable list of the converters that will be used. * @return the final converts list to use */ protected List<HttpMessageConverter<?>> postProcessConverters( List<HttpMessageConverter<?>> converters) { return converters; } /** * Method that can be used to post-process the {@link HttpMessageConverter} list * before it is used to configure the part converters of * {@link AllEncompassingFormHttpMessageConverter}. * @param converters a mutable list of the converters that will be used. * @return the final converts list to use * @since 1.3.0 */ protected List<HttpMessageConverter<?>> postProcessPartConverters( List<HttpMessageConverter<?>> converters) { return converters; } private List<HttpMessageConverter<?>> getDefaultConverters() { List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>(); if (ClassUtils.isPresent("org.springframework.web.servlet.config.annotation." + "WebMvcConfigurationSupport", null)) { converters.addAll(new WebMvcConfigurationSupport() { public List<HttpMessageConverter<?>> defaultMessageConverters() { return super.getMessageConverters(); } }.defaultMessageConverters()); } else { converters.addAll(new RestTemplate().getMessageConverters()); } reorderXmlConvertersToEnd(converters); return converters; } private void reorderXmlConvertersToEnd(List<HttpMessageConverter<?>> converters) { List<HttpMessageConverter<?>> xml = new ArrayList<HttpMessageConverter<?>>(); for (Iterator<HttpMessageConverter<?>> iterator = converters.iterator(); iterator .hasNext();) { HttpMessageConverter<?> converter = iterator.next(); if ((converter instanceof AbstractXmlHttpMessageConverter) || (converter instanceof MappingJackson2XmlHttpMessageConverter)) { xml.add(converter); iterator.remove(); } } converters.addAll(xml); } @Override public Iterator<HttpMessageConverter<?>> iterator() { return getConverters().iterator(); } /** * Return an immutable list of the converters in the order that they will be * registered. * @return the converters */ public List<HttpMessageConverter<?>> getConverters() { return this.converters; } private static void addClassIfExists(List<Class<?>> list, String className) { try { list.add(Class.forName(className)); } catch (ClassNotFoundException ex) { // Ignore } catch (NoClassDefFoundError ex) { // Ignore } }} |
5.自动注册MessageCodesResolver。
Spring MVC有一个生成错误代码的策略，用于呈现来自错误消息：MessageCodesResolver。如果设置了spring.mvc.message-codes-resolver.format属性PREFIX_ERROR_CODE或POSTFIX_ERROR_CODE，则spring Boot会创建一个MessageCodesResolver。
MessageCodesResolver.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | /* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.validation;/** * Strategy interface for building message codes from validation error codes. * Used by DataBinder to build the codes list for ObjectErrors and FieldErrors. * * <p>The resulting message codes correspond to the codes of a * MessageSourceResolvable (as implemented by ObjectError and FieldError). * * @author Juergen Hoeller * @since 1.0.1 * @see DataBinder#setMessageCodesResolver * @see ObjectError * @see FieldError * @see org.springframework.context.MessageSourceResolvable#getCodes() */public interface MessageCodesResolver { /** * Build message codes for the given error code and object name. * Used for building the codes list of an ObjectError. * @param errorCode the error code used for rejecting the object * @param objectName the name of the object * @return the message codes to use */ String[] resolveMessageCodes(String errorCode, String objectName); /** * Build message codes for the given error code and field specification. * Used for building the codes list of an FieldError. * @param errorCode the error code used for rejecting the value * @param objectName the name of the object * @param field the field name * @param fieldType the field type (may be {@code null} if not determinable) * @return the message codes to use */ String[] resolveMessageCodes(String errorCode, String objectName, String field, Class<?> fieldType);} |
6.静态index.html支持。
7.自定义Favicon支持(图标支持)
Spring Boot在配置的静态内容位置和类路径的根目录（按顺序）中查找favicon.ico。如果存在这样的文件，它将自动用作应用程序的favicon。
8.自动使用ConfigurableWebBindingInitializer
Spring MVC使用WeBindinginitializer为特定请求初始化WebDataBinder。如果您创建自己的Configurablewebindinginitializer，Spring Boot会自动将Spring MVC配置为使用它。
ConfigurableWebBindingInitializer.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | /* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.web.bind.support;import org.springframework.beans.PropertyEditorRegistrar;import org.springframework.core.convert.ConversionService;import org.springframework.validation.BindingErrorProcessor;import org.springframework.validation.MessageCodesResolver;import org.springframework.validation.Validator;import org.springframework.web.bind.WebDataBinder;import org.springframework.web.context.request.WebRequest;/** * Convenient {@link WebBindingInitializer} for declarative configuration * in a Spring application context. Allows for reusing pre-configured * initializers with multiple controller/handlers. * * @author Juergen Hoeller * @since 2.5 * @see #setDirectFieldAccess * @see #setMessageCodesResolver * @see #setBindingErrorProcessor * @see #setValidator(Validator) * @see #setConversionService(ConversionService) * @see #setPropertyEditorRegistrar */public class ConfigurableWebBindingInitializer implements WebBindingInitializer { private boolean autoGrowNestedPaths = true; private boolean directFieldAccess = false; private MessageCodesResolver messageCodesResolver; private BindingErrorProcessor bindingErrorProcessor; private Validator validator; private ConversionService conversionService; private PropertyEditorRegistrar[] propertyEditorRegistrars; /** * Set whether a binder should attempt to "auto-grow" a nested path that contains a null value. * <p>If "true", a null path location will be populated with a default object value and traversed * instead of resulting in an exception. This flag also enables auto-growth of collection elements * when accessing an out-of-bounds index. * <p>Default is "true" on a standard DataBinder. Note that this feature is only supported * for bean property access (DataBinder's default mode), not for field access. * @see org.springframework.validation.DataBinder#initBeanPropertyAccess() * @see org.springframework.validation.DataBinder#setAutoGrowNestedPaths */ public void setAutoGrowNestedPaths(boolean autoGrowNestedPaths) { this.autoGrowNestedPaths = autoGrowNestedPaths; } /** * Return whether a binder should attempt to "auto-grow" a nested path that contains a null value. */ public boolean isAutoGrowNestedPaths() { return this.autoGrowNestedPaths; } /** * Set whether to use direct field access instead of bean property access. * <p>Default is {@code false}, using bean property access. * Switch this to {@code true} in order to enforce direct field access. * @see org.springframework.validation.DataBinder#initDirectFieldAccess() * @see org.springframework.validation.DataBinder#initBeanPropertyAccess() */ public final void setDirectFieldAccess(boolean directFieldAccess) { this.directFieldAccess = directFieldAccess; } /** * Return whether to use direct field access instead of bean property access. */ public boolean isDirectFieldAccess() { return directFieldAccess; } /** * Set the strategy to use for resolving errors into message codes. * Applies the given strategy to all data binders used by this controller. * <p>Default is {@code null}, i.e. using the default strategy of * the data binder. * @see org.springframework.validation.DataBinder#setMessageCodesResolver */ public final void setMessageCodesResolver(MessageCodesResolver messageCodesResolver) { this.messageCodesResolver = messageCodesResolver; } /** * Return the strategy to use for resolving errors into message codes. */ public final MessageCodesResolver getMessageCodesResolver() { return this.messageCodesResolver; } /** * Set the strategy to use for processing binding errors, that is, * required field errors and {@code PropertyAccessException}s. * <p>Default is {@code null}, that is, using the default strategy * of the data binder. * @see org.springframework.validation.DataBinder#setBindingErrorProcessor */ public final void setBindingErrorProcessor(BindingErrorProcessor bindingErrorProcessor) { this.bindingErrorProcessor = bindingErrorProcessor; } /** * Return the strategy to use for processing binding errors. */ public final BindingErrorProcessor getBindingErrorProcessor() { return this.bindingErrorProcessor; } /** * Set the Validator to apply after each binding step. */ public final void setValidator(Validator validator) { this.validator = validator; } /** * Return the Validator to apply after each binding step, if any. */ public final Validator getValidator() { return this.validator; } /** * Specify a ConversionService which will apply to every DataBinder. * @since 3.0 */ public final void setConversionService(ConversionService conversionService) { this.conversionService = conversionService; } /** * Return the ConversionService which will apply to every DataBinder. */ public final ConversionService getConversionService() { return this.conversionService; } /** * Specify a single PropertyEditorRegistrar to be applied to every DataBinder. */ public final void setPropertyEditorRegistrar(PropertyEditorRegistrar propertyEditorRegistrar) { this.propertyEditorRegistrars = new PropertyEditorRegistrar[] {propertyEditorRegistrar}; } /** * Specify multiple PropertyEditorRegistrars to be applied to every DataBinder. */ public final void setPropertyEditorRegistrars(PropertyEditorRegistrar[] propertyEditorRegistrars) { this.propertyEditorRegistrars = propertyEditorRegistrars; } /** * Return the PropertyEditorRegistrars to be applied to every DataBinder. */ public final PropertyEditorRegistrar[] getPropertyEditorRegistrars() { return this.propertyEditorRegistrars; } @Override public void initBinder(WebDataBinder binder, WebRequest request) { binder.setAutoGrowNestedPaths(this.autoGrowNestedPaths); if (this.directFieldAccess) { binder.initDirectFieldAccess(); } if (this.messageCodesResolver != null) { binder.setMessageCodesResolver(this.messageCodesResolver); } if (this.bindingErrorProcessor != null) { binder.setBindingErrorProcessor(this.bindingErrorProcessor); } if (this.validator != null && binder.getTarget() != null && this.validator.supports(binder.getTarget().getClass())) { binder.setValidator(this.validator); } if (this.conversionService != null) { binder.setConversionService(this.conversionService); } if (this.propertyEditorRegistrars != null) { for (PropertyEditorRegistrar propertyEditorRegistrar : this.propertyEditorRegistrars) { propertyEditorRegistrar.registerCustomEditors(binder); } } }} |
2、扩展SpringMVC
如果您希望保留Spring Boot MVC功能，并且希望添加其他MVC配置（拦截器、格式化程序、视图控制器和其他功能），则可以添加自己的@configuration类，类型为webmvcconfiguer，但不添加@EnableWebMvc。如果希望提供RequestMappingHandlerMapping、RequestMappingHandlerAdapter或ExceptionHandlerExceptionResolver的自定义实例，则可以声明WebMVCregistrationAdapter实例来提供此类组件。
举个例子：
我们继承WebMvcConfigurer方法，添加自己的方法MyWebMvcConfig
MyWebMvcConfig.class
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | package com.zk.myspringboot;import java.util.List;import org.springframework.context.annotation.Configuration;import org.springframework.format.FormatterRegistry;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.validation.MessageCodesResolver;import org.springframework.validation.Validator;import org.springframework.web.method.support.HandlerMethodArgumentResolver;import org.springframework.web.method.support.HandlerMethodReturnValueHandler;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;import org.springframework.web.servlet.config.annotation.CorsRegistry;import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; /** * 静态资源映射 */@Configurationpublic class MyWebMvcConfig implements WebMvcConfigurer { @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { /* registry.addResourceHandler("/test/**") .addResourceLocations("classpath:/test/");*/ } @Override public void addArgumentResolvers(List<HandlerMethodArgumentResolver> arg0) { // TODO Auto-generated method stub } @Override public void addCorsMappings(CorsRegistry arg0) { // TODO Auto-generated method stub } @Override public void addFormatters(FormatterRegistry arg0) { // TODO Auto-generated method stub } @Override public void addInterceptors(InterceptorRegistry arg0) { // TODO Auto-generated method stub } @Override public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> arg0) { // TODO Auto-generated method stub } @Override public void addViewControllers(ViewControllerRegistry registry) { // TODO Auto-generated method stub registry.addViewController("/tang").setViewName("index"); } @Override public void configureAsyncSupport(AsyncSupportConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureContentNegotiation(ContentNegotiationConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureDefaultServletHandling(DefaultServletHandlerConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> arg0) { // TODO Auto-generated method stub } @Override public void configureMessageConverters(List<HttpMessageConverter<?>> arg0) { // TODO Auto-generated method stub } @Override public void configurePathMatch(PathMatchConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureViewResolvers(ViewResolverRegistry arg0) { // TODO Auto-generated method stub } @Override public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> arg0) { // TODO Auto-generated method stub } @Override public void extendMessageConverters(List<HttpMessageConverter<?>> arg0) { // TODO Auto-generated method stub } @Override public MessageCodesResolver getMessageCodesResolver() { // TODO Auto-generated method stub return null; } @Override public Validator getValidator() { // TODO Auto-generated method stub return null; }} |
这里我只试验了一个方法
1 2 3 4 5 | @Overridepublic void addViewControllers(ViewControllerRegistry registry) { // TODO Auto-generated method stub registry.addViewController("/tang").setViewName("index");} |
原理：
- WebMvcAutoConfiguration是SpringMVC的自动配置类
- 在做其他自动配置时会导入；@Import(EnableWebMvcConfiguration.class)
- 容器中所有的WebMvcConfigurer都会一起起作用
- 我们的配置类也会被调用
编写一个配置类（@Configuration），实现WebMvcConfigurer接口；不能标注@EnableWebMvc
这样既保留了所有的自动配置（MyMvcConfig），也能用我们扩展的配置；
MyMvcConfig.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | package com.zk.springboot004;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import org.springframework.web.servlet.view.InternalResourceViewResolver;@Configurationpublic class MyMvcConfig implements WebMvcConfigurer { @Override public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/index").setViewName("login"); registry.addViewController("/").setViewName("login"); }// private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {// "classpath:/META-INF/resources/", "classpath:/resources/",// "classpath:/static/", "classpath:/public/" };// @Override// public void addResourceHandlers(ResourceHandlerRegistry registry) {// if (!registry.hasMappingForPattern("/webjars/**")) {// registry.addResourceHandler("/webjars/**").addResourceLocations(// "classpath:/META-INF/resources/webjars/");// }// if (!registry.hasMappingForPattern("/**")) {// registry.addResourceHandler("/**").addResourceLocations(// CLASSPATH_RESOURCE_LOCATIONS);// }// }// @Bean// public InternalResourceViewResolver viewResolver() {// InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();// viewResolver.setPrefix("/WEB-INF/static/");// viewResolver.setSuffix(".html");// return viewResolver;// }} |
HelloController.java
1 2 3 4 5 6 7 8 9 10 11 12 | package com.zk.springboot004;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;@Controllerpublic class HelloController { @GetMapping("/login") public String loginpage(){ return "forward:/login.html"; }} |
Springboot004Application.java
1 2 3 4 5 6 7 8 9 10 11 12 13 | package com.zk.springboot004;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Springboot004Application { public static void main(String[] args) { SpringApplication.run(Springboot004Application.class, args); }} |
index.html
1 2 3 4 5 6 7 8 9 10 | <!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body>index</body></html> |
login.html
1 2 3 4 5 6 7 8 9 10 | <!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body>success</body></html> |
application.properties
1 2 3 4 | # 应用名称spring.application.name=springboot004# 应用服务 WEB 访问端口server.port=8080 |
效果SpringMVC的自动配置和我们的扩展配置都会起作用
访问http://localhost:8080/index或者http://localhost:8080/login
启动程序访问结果如下：
它会访问到login.html页面
3.全面接管SpringMVC
我们在重写的MyWebMvcConfig.class中添加@EnableWebMvc注解时，可以使SpringMVC的自动配置类失效，例如：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | package com.zk.springboot004;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@Configurationpublic class MyMvcConfig2 extends WebMvcConfigurerAdapter { @Override public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/index").setViewName("login"); registry.addViewController("/").setViewName("login"); }} |
注意是WebMvcConfigurerAdapter类型，不能标注@EnableWebMvc;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | package com.zk.myspringboot;import java.util.List;import org.springframework.context.annotation.Configuration;import org.springframework.format.FormatterRegistry;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.validation.MessageCodesResolver;import org.springframework.validation.Validator;import org.springframework.web.method.support.HandlerMethodArgumentResolver;import org.springframework.web.method.support.HandlerMethodReturnValueHandler;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;import org.springframework.web.servlet.config.annotation.CorsRegistry;import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; /** * 静态资源映射 */@Configuration@EnableWebMvcpublic class MyWebMvcConfig implements WebMvcConfigurer { @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { /* registry.addResourceHandler("/test/**") .addResourceLocations("classpath:/test/");*/ } @Override public void addArgumentResolvers(List<HandlerMethodArgumentResolver> arg0) { // TODO Auto-generated method stub } @Override public void addCorsMappings(CorsRegistry arg0) { // TODO Auto-generated method stub } @Override public void addFormatters(FormatterRegistry arg0) { // TODO Auto-generated method stub } @Override public void addInterceptors(InterceptorRegistry arg0) { // TODO Auto-generated method stub } @Override public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> arg0) { // TODO Auto-generated method stub } @Override public void addViewControllers(ViewControllerRegistry registry) { // TODO Auto-generated method stub registry.addViewController("/tang").setViewName("index"); } @Override public void configureAsyncSupport(AsyncSupportConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureContentNegotiation(ContentNegotiationConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureDefaultServletHandling(DefaultServletHandlerConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> arg0) { // TODO Auto-generated method stub } @Override public void configureMessageConverters(List<HttpMessageConverter<?>> arg0) { // TODO Auto-generated method stub } @Override public void configurePathMatch(PathMatchConfigurer arg0) { // TODO Auto-generated method stub } @Override public void configureViewResolvers(ViewResolverRegistry arg0) { // TODO Auto-generated method stub } @Override public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> arg0) { // TODO Auto-generated method stub } @Override public void extendMessageConverters(List<HttpMessageConverter<?>> arg0) { // TODO Auto-generated method stub } @Override public MessageCodesResolver getMessageCodesResolver() { // TODO Auto-generated method stub return null; } @Override public Validator getValidator() { // TODO Auto-generated method stub return null; }} |
全面接管SpringMVC，需要在配置类中添加@EnableWebMvc，我们可以跟一下@EnableWebMvc注解的方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | /* * Copyright 2002-2016 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.web.servlet.config.annotation;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;import org.springframework.context.annotation.Import;/** * Adding this annotation to an {@code @Configuration} class imports the Spring MVC * configuration from {@link WebMvcConfigurationSupport}, e.g.: * * <pre class="code"> * @Configuration * @EnableWebMvc * @ComponentScan(basePackageClasses = { MyConfiguration.class }) * public class MyWebConfiguration { * * } * </pre> * * <p>To customize the imported configuration, implement the interface * {@link WebMvcConfigurer} or more likely extend the empty method base class * {@link WebMvcConfigurerAdapter} and override individual methods, e.g.: * * <pre class="code"> * @Configuration * @EnableWebMvc * @ComponentScan(basePackageClasses = { MyConfiguration.class }) * public class MyConfiguration extends WebMvcConfigurerAdapter { * * @Override * public void addFormatters(FormatterRegistry formatterRegistry) { * formatterRegistry.addConverter(new MyConverter()); * } * * @Override * public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { * converters.add(new MyHttpMessageConverter()); * } * * // More overridden methods ... * } * </pre> * * <p>If {@link WebMvcConfigurer} does not expose some advanced setting that * needs to be configured, consider removing the {@code @EnableWebMvc} * annotation and extending directly from {@link WebMvcConfigurationSupport} * or {@link DelegatingWebMvcConfiguration}, e.g.: * * <pre class="code"> * @Configuration * @ComponentScan(basePackageClasses = { MyConfiguration.class }) * public class MyConfiguration extends WebMvcConfigurationSupport { * * @Override * public void addFormatters(FormatterRegistry formatterRegistry) { * formatterRegistry.addConverter(new MyConverter()); * } * * @Bean * public RequestMappingHandlerAdapter requestMappingHandlerAdapter() { * // Create or delegate to "super" to create and * // customize properties of RequestMappingHandlerAdapter * } * } * </pre> * * @author Dave Syer * @author Rossen Stoyanchev * @since 3.1 * @see org.springframework.web.servlet.config.annotation.WebMvcConfigurer * @see org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter * @see org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport * @see org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration */@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.TYPE)@Documented@Import(DelegatingWebMvcConfiguration.class)public @interface EnableWebMvc {} |
可以发现在这个接口中导入了DelegatingWebMvcConfiguration.class类，我们跟一下这个类
DelegatingWebMvcConfiguration.class
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | /* * Copyright 2002-2016 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.web.servlet.config.annotation;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Configuration;import org.springframework.format.FormatterRegistry;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.util.CollectionUtils;import org.springframework.validation.MessageCodesResolver;import org.springframework.validation.Validator;import org.springframework.web.method.support.HandlerMethodArgumentResolver;import org.springframework.web.method.support.HandlerMethodReturnValueHandler;import org.springframework.web.servlet.HandlerExceptionResolver;/** * A subclass of {@code WebMvcConfigurationSupport} that detects and delegates * to all beans of type {@link WebMvcConfigurer} allowing them to customize the * configuration provided by {@code WebMvcConfigurationSupport}. This is the * class actually imported by {@link EnableWebMvc @EnableWebMvc}. * * @author Rossen Stoyanchev * @since 3.1 */@Configurationpublic class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport { private final WebMvcConfigurerComposite configurers = new WebMvcConfigurerComposite(); @Autowired(required = false) public void setConfigurers(List<WebMvcConfigurer> configurers) { if (!CollectionUtils.isEmpty(configurers)) { this.configurers.addWebMvcConfigurers(configurers); } } @Override protected void configurePathMatch(PathMatchConfigurer configurer) { this.configurers.configurePathMatch(configurer); } @Override protected void configureContentNegotiation(ContentNegotiationConfigurer configurer) { this.configurers.configureContentNegotiation(configurer); } @Override protected void configureAsyncSupport(AsyncSupportConfigurer configurer) { this.configurers.configureAsyncSupport(configurer); } @Override protected void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) { this.configurers.configureDefaultServletHandling(configurer); } @Override protected void addFormatters(FormatterRegistry registry) { this.configurers.addFormatters(registry); } @Override protected void addInterceptors(InterceptorRegistry registry) { this.configurers.addInterceptors(registry); } @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { this.configurers.addResourceHandlers(registry); } @Override protected void addCorsMappings(CorsRegistry registry) { this.configurers.addCorsMappings(registry); } @Override protected void addViewControllers(ViewControllerRegistry registry) { this.configurers.addViewControllers(registry); } @Override protected void configureViewResolvers(ViewResolverRegistry registry) { this.configurers.configureViewResolvers(registry); } @Override protected void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) { this.configurers.addArgumentResolvers(argumentResolvers); } @Override protected void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) { this.configurers.addReturnValueHandlers(returnValueHandlers); } @Override protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) { this.configurers.configureMessageConverters(converters); } @Override protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) { this.configurers.extendMessageConverters(converters); } @Override protected void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) { this.configurers.configureHandlerExceptionResolvers(exceptionResolvers); } @Override protected void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) { this.configurers.extendHandlerExceptionResolvers(exceptionResolvers); } @Override protected Validator getValidator() { return this.configurers.getValidator(); } @Override protected MessageCodesResolver getMessageCodesResolver() { return this.configurers.getMessageCodesResolver(); }} |
可以发现这个类，它继承了WebMvcConfigurationSupport.class类
然而在我们的WebMvcAutoConfiguration，存在注解@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)，这个注解是当你未注入WebMvcConfigurationSupport.class累的时候，WebMvcAutoConfiguration类才会生效。
WebMvcAutoConfiguration.java
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528 529 530 531 532 533 534 | /* * Copyright 2012-2016 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.springframework.boot.autoconfigure.web;import java.util.Collection;import java.util.Collections;import java.util.Date;import java.util.List;import java.util.Map;import java.util.Map.Entry;import javax.servlet.Servlet;import javax.servlet.http.HttpServletRequest;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.ListableBeanFactory;import org.springframework.beans.factory.NoSuchBeanDefinitionException;import org.springframework.beans.factory.ObjectProvider;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.autoconfigure.AutoConfigureAfter;import org.springframework.boot.autoconfigure.AutoConfigureOrder;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;import org.springframework.boot.autoconfigure.web.ResourceProperties.Strategy;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.boot.web.filter.OrderedHiddenHttpMethodFilter;import org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter;import org.springframework.boot.web.filter.OrderedRequestContextFilter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Import;import org.springframework.context.annotation.Primary;import org.springframework.core.Ordered;import org.springframework.core.convert.converter.Converter;import org.springframework.core.convert.converter.GenericConverter;import org.springframework.core.io.Resource;import org.springframework.format.Formatter;import org.springframework.format.FormatterRegistry;import org.springframework.format.datetime.DateFormatter;import org.springframework.http.HttpHeaders;import org.springframework.http.MediaType;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.util.StringUtils;import org.springframework.validation.DefaultMessageCodesResolver;import org.springframework.validation.MessageCodesResolver;import org.springframework.web.accept.ContentNegotiationManager;import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;import org.springframework.web.context.request.RequestContextListener;import org.springframework.web.filter.HiddenHttpMethodFilter;import org.springframework.web.filter.HttpPutFormContentFilter;import org.springframework.web.filter.RequestContextFilter;import org.springframework.web.servlet.DispatcherServlet;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.LocaleResolver;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;import org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.ResourceChainRegistration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver;import org.springframework.web.servlet.handler.AbstractUrlHandlerMapping;import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;import org.springframework.web.servlet.i18n.FixedLocaleResolver;import org.springframework.web.servlet.mvc.ParameterizableViewController;import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;import org.springframework.web.servlet.resource.AppCacheManifestTransformer;import org.springframework.web.servlet.resource.GzipResourceResolver;import org.springframework.web.servlet.resource.ResourceHttpRequestHandler;import org.springframework.web.servlet.resource.ResourceResolver;import org.springframework.web.servlet.resource.VersionResourceResolver;import org.springframework.web.servlet.view.BeanNameViewResolver;import org.springframework.web.servlet.view.ContentNegotiatingViewResolver;import org.springframework.web.servlet.view.InternalResourceViewResolver;/** * {@link EnableAutoConfiguration Auto-configuration} for {@link EnableWebMvc Web MVC}. * * @author Phillip Webb * @author Dave Syer * @author Andy Wilkinson * @author Stephane Nicoll */@Configuration@ConditionalOnWebApplication@ConditionalOnClass({ Servlet.class, DispatcherServlet.class, WebMvcConfigurerAdapter.class })@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10)@AutoConfigureAfter(DispatcherServletAutoConfiguration.class)public class WebMvcAutoConfiguration { public static String DEFAULT_PREFIX = ""; public static String DEFAULT_SUFFIX = ""; @Bean @ConditionalOnMissingBean(HiddenHttpMethodFilter.class) public OrderedHiddenHttpMethodFilter hiddenHttpMethodFilter() { return new OrderedHiddenHttpMethodFilter(); } @Bean @ConditionalOnMissingBean(HttpPutFormContentFilter.class) @ConditionalOnProperty(prefix = "spring.mvc.formcontent.putfilter", name = "enabled", matchIfMissing = true) public OrderedHttpPutFormContentFilter httpPutFormContentFilter() { return new OrderedHttpPutFormContentFilter(); } // Defined as a nested config to ensure WebMvcConfigurerAdapter is not read when not // on the classpath @Configuration @Import(EnableWebMvcConfiguration.class) @EnableConfigurationProperties({ WebMvcProperties.class, ResourceProperties.class }) public static class WebMvcAutoConfigurationAdapter extends WebMvcConfigurerAdapter { private static final Log logger = LogFactory .getLog(WebMvcConfigurerAdapter.class); private final ResourceProperties resourceProperties; private final WebMvcProperties mvcProperties; private final ListableBeanFactory beanFactory; private final HttpMessageConverters messageConverters; final ResourceHandlerRegistrationCustomizer resourceHandlerRegistrationCustomizer; public WebMvcAutoConfigurationAdapter(ResourceProperties resourceProperties, WebMvcProperties mvcProperties, ListableBeanFactory beanFactory, HttpMessageConverters messageConverters, ObjectProvider<ResourceHandlerRegistrationCustomizer> resourceHandlerRegistrationCustomizerProvider) { this.resourceProperties = resourceProperties; this.mvcProperties = mvcProperties; this.beanFactory = beanFactory; this.messageConverters = messageConverters; this.resourceHandlerRegistrationCustomizer = resourceHandlerRegistrationCustomizerProvider .getIfAvailable(); } @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { converters.addAll(this.messageConverters.getConverters()); } @Override public void configureAsyncSupport(AsyncSupportConfigurer configurer) { Long timeout = this.mvcProperties.getAsync().getRequestTimeout(); if (timeout != null) { configurer.setDefaultTimeout(timeout); } } @Override public void configureContentNegotiation(ContentNegotiationConfigurer configurer) { Map<String, MediaType> mediaTypes = this.mvcProperties.getMediaTypes(); for (Entry<String, MediaType> mediaType : mediaTypes.entrySet()) { configurer.mediaType(mediaType.getKey(), mediaType.getValue()); } } @Bean @ConditionalOnMissingBean public InternalResourceViewResolver defaultViewResolver() { InternalResourceViewResolver resolver = new InternalResourceViewResolver(); resolver.setPrefix(this.mvcProperties.getView().getPrefix()); resolver.setSuffix(this.mvcProperties.getView().getSuffix()); return resolver; } @Bean @ConditionalOnBean(View.class) @ConditionalOnMissingBean public BeanNameViewResolver beanNameViewResolver() { BeanNameViewResolver resolver = new BeanNameViewResolver(); resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10); return resolver; } @Bean @ConditionalOnBean(ViewResolver.class) @ConditionalOnMissingBean(name = "viewResolver", value = ContentNegotiatingViewResolver.class) public ContentNegotiatingViewResolver viewResolver(BeanFactory beanFactory) { ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver(); resolver.setContentNegotiationManager( beanFactory.getBean(ContentNegotiationManager.class)); // ContentNegotiatingViewResolver uses all the other view resolvers to locate // a view so it should have a high precedence resolver.setOrder(Ordered.HIGHEST_PRECEDENCE); return resolver; } @Bean @ConditionalOnMissingBean @ConditionalOnProperty(prefix = "spring.mvc", name = "locale") public LocaleResolver localeResolver() { if (this.mvcProperties .getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) { return new FixedLocaleResolver(this.mvcProperties.getLocale()); } AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver(); localeResolver.setDefaultLocale(this.mvcProperties.getLocale()); return localeResolver; } @Bean @ConditionalOnProperty(prefix = "spring.mvc", name = "date-format") public Formatter<Date> dateFormatter() { return new DateFormatter(this.mvcProperties.getDateFormat()); } @Override public MessageCodesResolver getMessageCodesResolver() { if (this.mvcProperties.getMessageCodesResolverFormat() != null) { DefaultMessageCodesResolver resolver = new DefaultMessageCodesResolver(); resolver.setMessageCodeFormatter( this.mvcProperties.getMessageCodesResolverFormat()); return resolver; } return null; } @Override public void addFormatters(FormatterRegistry registry) { for (Converter<?, ?> converter : getBeansOfType(Converter.class)) { registry.addConverter(converter); } for (GenericConverter converter : getBeansOfType(GenericConverter.class)) { registry.addConverter(converter); } for (Formatter<?> formatter : getBeansOfType(Formatter.class)) { registry.addFormatter(formatter); } } private <T> Collection<T> getBeansOfType(Class<T> type) { return this.beanFactory.getBeansOfType(type).values(); } @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { if (!this.resourceProperties.isAddMappings()) { logger.debug("Default resource handling disabled"); return; } Integer cachePeriod = this.resourceProperties.getCachePeriod(); if (!registry.hasMappingForPattern("/webjars/**")) { customizeResourceHandlerRegistration( registry.addResourceHandler("/webjars/**") .addResourceLocations( "classpath:/META-INF/resources/webjars/") .setCachePeriod(cachePeriod)); } String staticPathPattern = this.mvcProperties.getStaticPathPattern(); if (!registry.hasMappingForPattern(staticPathPattern)) { customizeResourceHandlerRegistration( registry.addResourceHandler(staticPathPattern) .addResourceLocations( this.resourceProperties.getStaticLocations()) .setCachePeriod(cachePeriod)); } } @Bean public WelcomePageHandlerMapping welcomePageHandlerMapping( ResourceProperties resourceProperties) { return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage()); } private void customizeResourceHandlerRegistration( ResourceHandlerRegistration registration) { if (this.resourceHandlerRegistrationCustomizer != null) { this.resourceHandlerRegistrationCustomizer.customize(registration); } } @Bean @ConditionalOnMissingBean({ RequestContextListener.class, RequestContextFilter.class }) public static RequestContextFilter requestContextFilter() { return new OrderedRequestContextFilter(); } @Configuration @ConditionalOnProperty(value = "spring.mvc.favicon.enabled", matchIfMissing = true) public static class FaviconConfiguration { private final ResourceProperties resourceProperties; public FaviconConfiguration(ResourceProperties resourceProperties) { this.resourceProperties = resourceProperties; } @Bean public SimpleUrlHandlerMapping faviconHandlerMapping() { SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping(); mapping.setOrder(Ordered.HIGHEST_PRECEDENCE + 1); mapping.setUrlMap(Collections.singletonMap("**/favicon.ico", faviconRequestHandler())); return mapping; } @Bean public ResourceHttpRequestHandler faviconRequestHandler() { ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler(); requestHandler .setLocations(this.resourceProperties.getFaviconLocations()); return requestHandler; } } } /** * Configuration equivalent to {@code @EnableWebMvc}. */ @Configuration public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration { private final WebMvcProperties mvcProperties; private final ListableBeanFactory beanFactory; private final WebMvcRegistrations mvcRegistrations; public EnableWebMvcConfiguration( ObjectProvider<WebMvcProperties> mvcPropertiesProvider, ObjectProvider<WebMvcRegistrations> mvcRegistrationsProvider, ListableBeanFactory beanFactory) { this.mvcProperties = mvcPropertiesProvider.getIfAvailable(); this.mvcRegistrations = mvcRegistrationsProvider.getIfUnique(); this.beanFactory = beanFactory; } @Bean @Override public RequestMappingHandlerAdapter requestMappingHandlerAdapter() { RequestMappingHandlerAdapter adapter = super.requestMappingHandlerAdapter(); adapter.setIgnoreDefaultModelOnRedirect(this.mvcProperties == null ? true : this.mvcProperties.isIgnoreDefaultModelOnRedirect()); return adapter; } @Override protected RequestMappingHandlerAdapter createRequestMappingHandlerAdapter() { if (this.mvcRegistrations != null && this.mvcRegistrations.getRequestMappingHandlerAdapter() != null) { return this.mvcRegistrations.getRequestMappingHandlerAdapter(); } return super.createRequestMappingHandlerAdapter(); } @Bean @Primary @Override public RequestMappingHandlerMapping requestMappingHandlerMapping() { // Must be @Primary for MvcUriComponentsBuilder to work return super.requestMappingHandlerMapping(); } @Override protected RequestMappingHandlerMapping createRequestMappingHandlerMapping() { if (this.mvcRegistrations != null && this.mvcRegistrations.getRequestMappingHandlerMapping() != null) { return this.mvcRegistrations.getRequestMappingHandlerMapping(); } return super.createRequestMappingHandlerMapping(); } @Override protected ConfigurableWebBindingInitializer getConfigurableWebBindingInitializer() { try { return this.beanFactory.getBean(ConfigurableWebBindingInitializer.class); } catch (NoSuchBeanDefinitionException ex) { return super.getConfigurableWebBindingInitializer(); } } @Override protected ExceptionHandlerExceptionResolver createExceptionHandlerExceptionResolver() { if (this.mvcRegistrations != null && this.mvcRegistrations .getExceptionHandlerExceptionResolver() != null) { return this.mvcRegistrations.getExceptionHandlerExceptionResolver(); } return super.createExceptionHandlerExceptionResolver(); } @Override protected void configureHandlerExceptionResolvers( List<HandlerExceptionResolver> exceptionResolvers) { super.configureHandlerExceptionResolvers(exceptionResolvers); if (exceptionResolvers.isEmpty()) { addDefaultHandlerExceptionResolvers(exceptionResolvers); } if (this.mvcProperties.isLogResolvedException()) { for (HandlerExceptionResolver resolver : exceptionResolvers) { if (resolver instanceof AbstractHandlerExceptionResolver) { ((AbstractHandlerExceptionResolver) resolver) .setWarnLogCategory(resolver.getClass().getName()); } } } } } @Configuration @ConditionalOnEnabledResourceChain static class ResourceChainCustomizerConfiguration { @Bean public ResourceChainResourceHandlerRegistrationCustomizer resourceHandlerRegistrationCustomizer() { return new ResourceChainResourceHandlerRegistrationCustomizer(); } } interface ResourceHandlerRegistrationCustomizer { void customize(ResourceHandlerRegistration registration); } private static class ResourceChainResourceHandlerRegistrationCustomizer implements ResourceHandlerRegistrationCustomizer { @Autowired private ResourceProperties resourceProperties = new ResourceProperties(); @Override public void customize(ResourceHandlerRegistration registration) { ResourceProperties.Chain properties = this.resourceProperties.getChain(); configureResourceChain(properties, registration.resourceChain(properties.isCache())); } private void configureResourceChain(ResourceProperties.Chain properties, ResourceChainRegistration chain) { Strategy strategy = properties.getStrategy(); if (strategy.getFixed().isEnabled() || strategy.getContent().isEnabled()) { chain.addResolver(getVersionResourceResolver(strategy)); } if (properties.isGzipped()) { chain.addResolver(new GzipResourceResolver()); } if (properties.isHtmlApplicationCache()) { chain.addTransformer(new AppCacheManifestTransformer()); } } private ResourceResolver getVersionResourceResolver( ResourceProperties.Strategy properties) { VersionResourceResolver resolver = new VersionResourceResolver(); if (properties.getFixed().isEnabled()) { String version = properties.getFixed().getVersion(); String[] paths = properties.getFixed().getPaths(); resolver.addFixedVersionStrategy(version, paths); } if (properties.getContent().isEnabled()) { String[] paths = properties.getContent().getPaths(); resolver.addContentVersionStrategy(paths); } return resolver; } } static final class WelcomePageHandlerMapping extends AbstractUrlHandlerMapping { private static final Log logger = LogFactory .getLog(WelcomePageHandlerMapping.class); private WelcomePageHandlerMapping(Resource welcomePage) { if (welcomePage != null) { logger.info("Adding welcome page: " + welcomePage); ParameterizableViewController controller = new ParameterizableViewController(); controller.setViewName("forward:index.html"); setRootHandler(controller); setOrder(0); } } @Override public Object getHandlerInternal(HttpServletRequest request) throws Exception { for (MediaType mediaType : getAcceptedMediaTypes(request)) { if (mediaType.includes(MediaType.TEXT_HTML)) { return super.getHandlerInternal(request); } } return null; } private List<MediaType> getAcceptedMediaTypes(HttpServletRequest request) { String acceptHeader = request.getHeader(HttpHeaders.ACCEPT); return MediaType.parseMediaTypes( StringUtils.hasText(acceptHeader) ? acceptHeader : "*/*"); } }} |
所以，当我们配置了@EnableWebMvc，就相当于导入了WebMvcConfigurationSupport，所以原始的SpringMVC自动配置类失效。@EnableWebMvc将WebMvcConfigurationSupport组件导入进来，导入的WebMvcConfigurationSupport只是SpringMVC最基本的功能。
4.修改SpringBoot的默认配置
1.SpringBoot在自动配置很多组件的时候，先看一下容器中有没有用户自己配置的(@bean@Component)，如果有就用用户配置的，如果没有才会自己配置，如果有多个组件可以有多个(viewresolver)将用户配置和自己的配置结合起来。
2.在SpringBoot中会有很多的xxxConfigurer帮助我们进行扩展。
3.在SpringBoot中会有很多的xxxCustomizer帮助我们定制。
例如：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | package com.zk.myspringboot;import java.util.Locale;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Bean;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;@SpringBootApplicationpublic class SpringBootApplicationFirst { public static void main(String[]args){ SpringApplication.run(SpringBootApplicationFirst.class, args); } @Bean public ViewResolver myViewResolver(){ return new myViewResolver(); } @Bean public ViewResolver myViewResolver01(){ return new myViewResolver01(); } private static class myViewResolver implements ViewResolver{ @Override public View resolveViewName(String string, Locale locale) throws Exception { // TODO Auto-generated method stub return null; } } private static class myViewResolver01 implements ViewResolver{ @Override public View resolveViewName(String string, Locale locale) throws Exception { // TODO Auto-generated method stub return null; } }} |
打入debug模式可以在控制台中看到我们的viewResolvers中我们自定义的两个视图
分类:
SpringBoot
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