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java 解析Json数据

一、普通json格式

如:{“name”:“乔治”,“id”:1}

   private void getObject(String json){ JSONObject jsonObject = JSON.parseObject(json); String id = jsonObject.getString("id"); String s = jsonObject.getString("name"); System.out.println(id); System.out.println(s);    }

二、json中包含对象

如:{“user”:{“id”:2,“name”:“王”}}

      private void getObject2(String json){ JSONObject jsonObject = JSON.parseObject(json); JSONObject user = jsonObject.getJSONObject("user"); Integer id = user.getInteger("id"); String name = user.getString("name"); System.out.println(id); System.out.println(name);}

三、json中包含list集合

如:{“list”:[{“id”:3,“name”:“忘3”},{“id”:4,“name”:“忘4”},{“id”:5,“name”:“忘5”},{“id”:6,“name”:“忘6”},{“id”:7,“name”:“忘7”},{“id”:8,“name”:“忘8”},{“id”:9,“name”:“忘9”},{“id”:10,“name”:“忘10”}]}

    private void getArray(String json){ List list = new ArrayList(); JSONObject jsonObject = JSON.parseObject(json); JSONArray userList = jsonObject.getJSONArray("list"); for (int i = 0; i < userList.size();i++){     User2 user2 = new User2();     JSONObject jsonObject1 = userList.getJSONObject(i);     System.out.println(jsonObject1.toString());     user2.setId(jsonObject1.getInteger("id"));     user2.setName(jsonObject1.getString("name"));     list.add(user2); } System.out.println(JSON.toJSON(list));    }

四、json中包含map集合

如 :{“map”:{“钱”:“14”,“赵”:“12”,“王”:“13”}}

   private  void getMap(String json){ JSONObject jsonObject = JSON.parseObject(json); JSONObject map = jsonObject.getJSONObject("map"); //获取到所有的key Set strings = map.keySet(); //h获取迭代器 Iterator iterator = strings.iterator(); while(iterator.hasNext()){     String next = iterator.next();     String string = map.getString(next);     System.out.println(next+":"+string); }    }

五、json中包含list

如:{“listMap”:[{“钱”:“14”,“赵”:“12”,“王”:“13”},{“钱2”:“14”,“王2”:“13”,“赵2”:“12”}]}

    private void getListMap(String json){ JSONObject jsonObject = JSON.parseObject(json); JSONArray listMap = jsonObject.getJSONArray("listMap"); for (int i = 0;i<listMap.size();i++){     JSONObject jsonObject1 = listMap.getJSONObject(i);     Set strings = jsonObject1.keySet();     Iterator iterator = strings.iterator();     while (iterator.hasNext()){  String next = iterator.next();  String string = jsonObject1.getString(next);  System.out.println(next+":"+string);     } }    }