Springmvc 4.x利用@ResponseBody返回Json数据的方法

下面是官方文档对于@responsebody注解的解释：

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. 

@resopnsebody注解能够 直接把 控制器返回变量（string）直接 返回给浏览器,也可以通过配置 后，把 对象 序列化成json数据返回给浏览器！如果为 null 就会返回空白。

怎么配置呢 ？需要配置messageconverter:

<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> 

下面贴出在官方文档中的位置：

这个需要jackson jar包支持，需要 jackson-annotations,jackson-core,jackson-databind三个包，：

控制器代码：

@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; 
  }

jquery代码：

//|增加 
    $("#hanblog_add_btn").click(function(){ 
      var classname=$("#add_input_name").val(); 
      var classintroduction=$("#add_input_introduction").val(); 
      alert("分类名称:"+classname+"分类介绍:"+classintroduction); 
      $.get("<c:url value="/house/classmanager/addbyajax.do" />",function(result){ 
        alert(result); 
      }); 
    }); 

运行返回例子：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。