SpringMVC 拦截返回值，并自定义

有关取代mvc:annotation-driven使用自定义配置请看：

http://blog.csdn.net/cml_blog/article/details/45222431

1、在项目开发中，自定义全局返回值拦截是非常实用的，就如在Struts2的拦截器中，可以根据Action的返回值自定义返回信息，如果返回SUCCESS就统一返回一个成功的json对象，如果FAIL就返回全局的定义信息

2、配置xml：

<context:component-scan base-package="com.cml.mvc.*" /><!-- 取代mvc:annotation-driven> --><beanclass="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean><!-- 采用SpringMVC自带的JSON转换工具，支持@ResponseBody注解 --><beanclass=" org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><!-- 自定义返回值拦截 --><property name="responseBodyAdvice"><list><bean class="com.cml.mvc.base.MyResponseBodyAdvice"></bean></list></property><!-- 自定义返回值校验 --><property name="customReturnValueHandlers"><list><bean class="com.cml.mvc.base.MyReturnValues"></bean></list></property><!-- 注入全局的propertiesEditor --><property name="webBindingInitializer"><bean class="com.cml.mvc.base.BaseWebBindingInital"><property name="timeFormatter" value="yyyy-MM-dd HH:mm:ss"></property></bean></property><property name="contentNegotiationManager" ref="contentNegotiationManager"></property></bean><!-- 避免IE执行AJAX时,返回JSON出现下载文件 --><bean id="mappingJacksonHttpMessageConverter"class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"><property name="supportedMediaTypes"><list><value>text/html;charset=UTF-8</value></list></property></bean><bean id="contentNegotiationManager"class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean"><property name="favorPathExtension" value="false" /><property name="favorParameter" value="true" /><property name="mediaTypes"><value>json=application/jsonxml=application/xml</value></property></bean><!-- 取代mvc:annotation-driven> end -->

2、自定义返回值拦截类，只要实现 org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice接口即可

package com.cml.mvc.base;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.core.MethodParameter;import org.springframework.http.MediaType;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;import org.springframework.http.server.ServerHttpRequest;import org.springframework.http.server.ServerHttpResponse;import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;import com.cml.mvc.beans.Result;public class MyResponseBodyAdvice implements ResponseBodyAdvice<Result> {private static Log log = LogFactory.getLog(MyResponseBodyAdvice.class);@Overridepublic boolean supports(MethodParameter returnType,Class<? extends HttpMessageConverter<?>> converterType) {log.debug("MyResponseBodyAdvice==>supports:" + converterType);log.debug("MyResponseBodyAdvice==>supports:" + returnType.getClass());log.debug("MyResponseBodyAdvice==>supports:"+ MappingJackson2HttpMessageConverter.class.isAssignableFrom(converterType));return MappingJackson2HttpMessageConverter.class.isAssignableFrom(converterType);}@Overridepublic Result beforeBodyWrite(Result body, MethodParameter returnType,MediaType selectedContentType,Class<? extends HttpMessageConverter<?>> selectedConverterType,ServerHttpRequest request, ServerHttpResponse response) {log.debug("MyResponseBodyAdvice==>beforeBodyWrite:" + returnType + ","+ body);body.setB("我是后面设置的");return body;}}

3、controller中只要返回自定义的Result对象，就可以拦截到转换信息，controller代码

       @RequestMapping("/times")@ResponseBodypublic Result getTime( Integer id) {log.debug("==========>getTime,id:" + id);Result result=new Result();result.setA(1);return result;}

action中设置了A的值为1，在页面上返回结果：

成功实现自定义返回信息。