FastJson converts json string into JSONObject object

 String jsonStr = "{\n" +
         "  \"flag\": true,\n" +
         "  \"code\": 200,\n" +
         "  \"message\": \"请求成功\",\n" +
         "  \"data\": \"\\省略了.... 这个是大串儿json字符串" +
         "}";
   JSONObject jsonObject1 = JSONObject.parseObject(jsonStr); //将json字符串转成JSONObject对象
   Object code = jsonObject1.get("code"); //获取值
   Object data = jsonObject1.get("data");//获取值
   System.out.println("code = " + code);
   System.out.println("data = " + data);