springMVC返回复杂的json格式数据方法

{  "total":2,  "list":[    {      "person":{"name":"eakom0","key":0},      "msg":{"cod":0,"name":"eakom0"}    },    {      "person":{"name":"eakom1","key":1},      "msg":{"cod":1,"name":"eakom1"}    }  ],  "attachment":{"name":"附件","version":1}}

@RequestMapping("returnJson")  public void returnJson (HttpServletRequest request, HttpServletResponse response){      JSONObject json = new JSONObject();       json.element("total", 2);      List<Map<String,JSONObject>> list=new ArrayList<Map<String,JSONObject>>();      for(int i=0;i<2;i++){        JSONObject person=new JSONObject();        person.element("name", "eakom"+i);        person.element("key", i);        JSONObject msg=new JSONObject();        msg.element("name", "eakom"+i);        msg.element("cod", i);        Map<String,JSONObject> map=new HashMap<String,JSONObject>();        map.put("person", person);        map.put("msg", msg);        list.add(map);      }      json.element("list", list);      JSONObject attachment=new JSONObject();      attachment.element("name", "附件");      attachment.element("version", 1);      json.element("attachment", attachment);      responseDatagrid(response, json);  }  public void responseDatagrid(HttpServletResponse response, JSONObject jObject) {    response.setContentType("application/json");    response.setHeader("Cache-Control", "no-store");    try {      PrintWriter pw=response.getWriter();      pw.write(jObject.toString());      pw.flush();    } catch (IOException e) {      e.printStackTrace();    }  }