这篇文章主要介绍了Springmvc 4.x利用@ResponseBody返回Json数据的方法，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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-8text/json;charset=UTF-8application/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：
