Mapping the response body with the @ResponseBody annotation The @ResponseBody annotation is similar to @RequestBody. This annotation can be put on a method and indicates that the return type should be written straight to the HTTP response body (and not placed in a Model, or interpreted as a view name). For example: @RequestMapping(path = "/something", method = RequestMethod.PUT) @ResponseBody public String helloWorld() { return "Hello World"; } The above example will result in the text Hello World being written to the HTTP response stream. As with @RequestBody, Spring converts the returned object to a response body by using an HttpMessageConverter. For more information on these converters, see the previous section and Message Converters. 

<bean      class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">      <property name="messageConverters">        <list>          <ref bean="mappingJackson2HttpMessageConverter" />        </list>      </property>    </bean>    <bean id="mappingJackson2HttpMessageConverter"      class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">      <property name="supportedMediaTypes">        <list>          <value>text/html;charset=UTF-8</value>          <value>text/json;charset=UTF-8</value>          <value>application/json;charset=UTF-8</value>        </list>      </property>    </bean> 

@RequestMapping("House/ClassManager/addByAjax")   @ResponseBody   public HanBlog_Class ClassManager_addByAjax(HttpServletRequest request){     if(request.getSession().getAttribute("hanblog_uid")==null) return null;     HanBlog_Class objClass=new HanBlog_Class();     return objClass;   }

//|增加     $("#hanblog_add_btn").click(function(){       var classname=$("#add_input_name").val();       var classintroduction=$("#add_input_introduction").val();       alert("分類名稱:"+classname+"分類介紹:"+classintroduction);       $.get("<c:url value="/House/ClassManager/addByAjax.do" />",function(result){         alert(result);       });     });