spring 动态设置 RequestMapping

 

原理：自定义 HandlerMapping ，把请求都集中到一个controller中

 

定义自己的 HandlerMapping

package com.example.demo;

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.servlet.handler.AbstractHandlerMapping;

/**
 * @author siqi
 */
public class MyHandlerMapping extends AbstractHandlerMapping {

    public WelcomeController welcomeController;

    @Override
    protected Object getHandlerInternal(HttpServletRequest request) throws Exception {
        return welcomeController;
    }
}

 

定义controller

package com.example.demo;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class WelcomeController extends AbstractController {
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
        throws Exception {

        System.out.println("simple url======");

        response.getWriter().write("hello");
        return null;
    }

}

 

添加到容器中

@Bean
    public WelcomeController simpleUrlController() {
        return new WelcomeController();
    }

    @Bean
    public MyHandlerMapping myHandlerMapping() {
        MyHandlerMapping myHandlerMapping = new MyHandlerMapping();
        //注意优先级
        myHandlerMapping.setOrder(Integer.MAX_VALUE - 10);
        myHandlerMapping.welcomeController = simpleUrlController();
        return myHandlerMapping;
    }

 

完成

 

 

BeanNameUrlHandlerMapping

　　根据bean的名字即为url地址，需要以"/"开头，支持通配符

@Configuration
public class BeanNameUrlHandlerMappingConfig {
    @Bean
    BeanNameUrlHandlerMapping beanNameUrlHandlerMapping() {
        return new BeanNameUrlHandlerMapping();
    }
 
    @Bean("/beanNameUrl")
    public WelcomeController welcome() {
        return new WelcomeController();
    }
}

可以在xml中配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">


    <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <value>
                /simpleurl=simpleUrlController
            </value>
        </property>
        <property name="order" value="1"/>

    </bean>
    <bean id="simpleUrlController" class="com.example.demo.WelcomeController"/>


</beans>

 

package com.example.demo;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class WelcomeController extends AbstractController {
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
        throws Exception {

        System.out.println("simple url======");

        response.getWriter().write("hello");

        return null;
    }

}

 

SimpleUrlHandlerMapping

　　更加灵活，可以在url和bean之间随意指定

@Configuration
public class SimpleUrlHandlerMappingConfig {
 
    @Bean
    public SimpleUrlHandlerMapping simpleUrlHandlerMapping() {
        SimpleUrlHandlerMapping simpleUrlHandlerMapping
          = new SimpleUrlHandlerMapping();
        
        Map<String, Object> urlMap = new HashMap<>();
        urlMap.put("/simpleUrlWelcome", welcome());
        simpleUrlHandlerMapping.setUrlMap(urlMap);
        
        return simpleUrlHandlerMapping;
    }
 
    @Bean
    public WelcomeController welcome() {
        return new WelcomeController();
    }
}

同等xml

<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
        <value>
            /simpleUrlWelcome=welcome
            /*/simpleUrlWelcome=welcome
        </value>
    </property>
</bean>
<bean id="welcome" class="com.baeldung.WelcomeController" />

或

<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
        <props>
            <prop key="/simpleUrlWelcome">welcome</prop>
            <prop key="/*/simpleUrlWelcome">welcome</prop>
        </props>
    </property>
</bean>

 

WelcomePageHandlerMapping

　　默认页面的映射，在静态资源路径下 找 index.html 文件

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties {

    private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/",
            "classpath:/resources/", "classpath:/static/", "classpath:/public/" };

    /**
     * Locations of static resources. Defaults to classpath:[/META-INF/resources/,
     * /resources/, /static/, /public/].
     */
    private String[] staticLocations = CLASSPATH_RESOURCE_LOCATIONS;

WebMvcAutoConfiguration.java

        @Bean
        public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext,
                FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
            WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(
                    new TemplateAvailabilityProviders(applicationContext), applicationContext, getWelcomePage(),
                    this.mvcProperties.getStaticPathPattern());
            welcomePageHandlerMapping.setInterceptors(getInterceptors(mvcConversionService, mvcResourceUrlProvider));
            welcomePageHandlerMapping.setCorsConfigurations(getCorsConfigurations());
            return welcomePageHandlerMapping;
        }

 

 

参考：https://www.baeldung.com/spring-handler-mappings

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