利用RequestMappingHandlerMapping提取Spring MVC @RequestMapping

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Spring MVC 映射注入类继承结构

其中getHandlerMethods能够获取所有处理方法和映射，代码如下：

    /**
     * Return a map with all handler methods and their mappings.
     */
    public Map<T, HandlerMethod> getHandlerMethods() {
        return Collections.unmodifiableMap(this.handlerMethods);
    }

如果能够获得RequestMappingInfoHaddlerMapping Bean实例，就能通过getHandlerMethods（）方法得到使用Spring MVC注解的处理方法和映射对象RequestMappingInfo。

RequestMappingInfo存储中所有Handler的配置信息。

使用@Configuration注解配置Bean，获取RequestMappingHandlerMapping

package com.zokapper.configration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

@Configuration
public class RequestMappingHandlerConfig{
    @Bean
    public RequestMappingHandlerMapping requestMappingHandlerMapping() {
        RequestMappingHandlerMapping mapping = new RequestMappingHandlerMapping();
        return mapping;
    }
}

编写测试类测试

package com.zokapper.configuration;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

import com.zokapper.configuration.RequestMappingHandlerConfig;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {  "classpath:applicationContext-[MVC].xml","classpath:applicationContext.xml"})
public class RequestMappingHandlerConfigTest {

    @Autowired
    RequestMappingHandlerConfig requestMappingHandlerConfig;

    //Spring MVC 提取注解中URL映射
    @Test
    public void detectHandlerMethods(){
        final RequestMappingHandlerMapping requestMappingHandlerMapping = requestMappingHandlerConfig.requestMappingHandlerMapping ();
        Map<RequestMappingInfo, HandlerMethod> map = requestMappingHandlerMapping.getHandlerMethods();

        Set<RequestMappingInfo> mappings = map.keySet();
        Map<String, String> reversedMap = new HashMap<String, String>();
        for(RequestMappingInfo info : mappings) {
            HandlerMethod method = map.get(info);
            System.out.println (method.toString()+"===>"+info.getPatternsCondition().toString());
        }
    }
}