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:

  
      
        
   
        
      
    
    
      
        
 text/html;charset=UTF-8  
 text/json;charset=UTF-8  
 application/json;charset=UTF-8  
        
      
   

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("",function(result){ 
 alert(result); 
      }); 
    }); 

运行返回例子：

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