详解使用@RequestBody取POST方式的json字符串

 var json_data={
       "name" : "demographics",
       "params" : [1 , 2, 3],
       "items" : [ {"name" : "中文", "value" : 10 }, 
             {"name": "item2", "value" : 20 }
            ]
      };
    $.ajax({
    url : 'chart/graphics',
    type : 'post',
    data : JSON.stringify(json_data),
    contentType : 'application/json;charset=utf-8'  //中文需要加上charset=utf-8才正确
   });

  @RequestMapping(value="/{name}", method=RequestMethod.POST, produces="application/json;charset=utf-8;")
  @ResponseBody
  public String postDashboardItem( 
      @PathVariable(value="name") String name,
      @RequestBody String params, 

       Model model) {

   JSONObject object= JSON.parseObject(params);

   //do somthings

   return ""; //json string

}

  @RequestMapping(value="/{name}", method=RequestMethod.POST, produces="application/json;charset=utf-8;")
  @ResponseBody
  public String postDashboardItem( 
      @PathVariable(value="name") String name,
      @RequestBody Map<String, Object> params, 

       Model model) {

   //do somthings 
   return ""; //json string

}