自己做得json测试类，包含JSONArray，JSONObject，Gson基本使用方法

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public class MainClass {

   public static void main(String[] args) {
       List<MessageModel> list = new ArrayList<MessageModel>();
       MessageModel msg = new MessageModel();
       MessageModel msg1 = new MessageModel();
       msg.setMessage("我的msg");
       msg.setObject("str");
       msg.setSuccess(1);
       msg1.setMessage("我的msg2");
       msg1.setObject("str2");
       msg1.setSuccess(1);
       list.add(msg);
       list.add(msg1);
       Map<String,Object> map = new HashMap<String,Object>();
       map.put("obj", list);
       map.put("obj1", "123456");
       String str = new Gson().toJson(list);
       String str2 = new Gson().toJson(map);
       System.out.println(str2);
       try{

           JSONObject jo = new JSONObject(str2);
           String st=jo.optString("obj1");
           System.out.println(st);
           JSONArray ja = new JSONArray(jo.opt("obj").toString());
           for(int i=0;i<ja.length();i++){
               JSONObject joo = new JSONObject(ja.get(i).toString());
               System.out.println(joo.opt("message").toString());
               System.out.println(joo.opt("object").toString());
               System.out.println(joo.opt("success").toString());
           }
           List<MessageModel> list2 = new Gson().fromJson(jo.opt("obj").toString(),new TypeToken<List<MessageModel>>(){}.getType());;
           List<MessageModel> list1 = new Gson().fromJson(str,new TypeToken<List<MessageModel>>(){}.getType());
           System.out.println(list1);
       }catch(Exception e){
           e.printStackTrace();
       }

   }

}

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