SpringMVC 拦截返回值，并自定义-蒲公英云

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> -->
    <bean
        class="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 -->
    <bean
        class=" 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/json
                xml=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);
    @Override
    public 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);
    }
    @Override
    public 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")
    @ResponseBody
    public Result getTime( Integer id) {
        log.debug("==========>getTime,id:" + id);
        Result result=new Result();
        result.setA(1);
        return result;
    }