SpringMVC 拦截返回值，并自定义

深碍√TFBOYSˉ_ 2022-08-07 21:00 188阅读 0赞

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][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.*" />
    
    	
    	<bean
    		class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
    	</bean>
    
    	
    	<bean
    		class=" org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    		
    		<property name="responseBodyAdvice">
    			<list>
    				<bean class="com.cml.mvc.base.MyResponseBodyAdvice"></bean>
    			</list>
    		</property>
    		
    		<property name="customReturnValueHandlers">
    			<list>
    				<bean class="com.cml.mvc.base.MyReturnValues"></bean>
    			</list>
    		</property>
    		
    		
    		<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>
    	
    	<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>

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;
    	}

action中设置了A的值为1，在页面上返回结果：

![Center][]  
成功实现自定义返回信息。

[http_blog.csdn.net_cml_blog_article_details_45222431]: http://blog.csdn.net/cml_blog/article/details/45222431
[Center]: /images/20220805/7fbe8024f1b348eb9c2478b850eb5be5.png