WebMvcConfigurerAdapter 和 WebMvcConfigurer
一、简介
两者都是Spring内部的一种配置方式，WebMvcConfigurerAdapter 是一个类，已过期；WebMvcConfigurer是一个接口，替代方案；
采用JavaBean的形式来代替传统的xml配置文件形式进行针对框架个性化定制。
二、WebMvcConfigurerAdapter常用的方法
/**添加Converters和Formatters*/ default void addFormatters(FormatterRegistry registry) /**拦截器*/ default void addInterceptors(InterceptorRegistry registry) /**静态资源处理器*/ default void addResourceHandlers(ResourceHandlerRegistry registry) /**解决跨域问题*/ default void addCorsMappings(CorsRegistry registry) /** 使用addViewController实现实现无业务逻辑跳转*/ default void addViewControllers(ViewControllerRegistry registry) /**视图解析器*/ default void configureViewResolvers(ViewResolverRegistry registry)
1、addInterceptors：拦截器
addInterceptor：需要一个实现HandlerInterceptor接口的拦截器实例
addPathPatterns：用于设置拦截器的过滤路径规则
excludePathPatterns：用于设置不需要拦截的过滤规则
@Override public void addInterceptors(InterceptorRegistry registry) { super.addInterceptors(registry); registry.addInterceptor(new TestInterceptor()).addPathPatterns("/**"); }
2、addCorsMappings：跨域
@Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/cors/**") .allowedHeaders("*") .allowedMethods("POST","GET") .allowedOrigins("*"); }
3、addViewControllers：跳转指定页面
@Override public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/").setViewName("/index"); //实现一个请求到视图的映射，而无需书写controller registry.addViewController("/login").setViewName("forward:/index.html"); }
4、resourceViewResolver：视图解析器
/** * 配置请求视图映射 * @return */ @Bean public InternalResourceViewResolver resourceViewResolver() { InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver(); //请求视图文件的前缀地址 internalResourceViewResolver.setPrefix("/WEB-INF/jsp/"); //请求视图文件的后缀 internalResourceViewResolver.setSuffix(".jsp"); return internalResourceViewResolver; } /** * 视图配置 * @param registry */ @Override public void configureViewResolvers(ViewResolverRegistry registry) { super.configureViewResolvers(registry); registry.viewResolver(resourceViewResolver()); /*registry.jsp("/WEB-INF/jsp/",".jsp");*/ }
5. configureMessageConverters：信息转换器
/** * 消息内容转换配置 * 配置fastJson返回json转换 * @param converters */ @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { //调用父类的配置 super.configureMessageConverters(converters); //创建fastJson消息转换器 FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); //创建配置类 FastJsonConfig fastJsonConfig = new FastJsonConfig(); //修改配置返回内容的过滤 fastJsonConfig.setSerializerFeatures( SerializerFeature.DisableCircularReferenceDetect, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullStringAsEmpty ); fastConverter.setFastJsonConfig(fastJsonConfig); //将fastjson添加到视图消息转换器列表内 converters.add(fastConverter); }
6、addResourceHandlers：静态资源
@Override public void addResourceHandlers(ResourceHandlerRegistry registry) { //处理静态资源的，例如：图片，js，css等 registry.addResourceHandler("/resource/**").addResourceLocations("/WEB-INF/static/"); }
