com.alibaba.fastjson.JSONObject、JSONArray與String之間的轉換demo

話不多說,直接上代碼

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

import java.util.Map;

/**
 * Created by LH on 2019/2/21 14:08
 */
public class JsonDemo {

    public static void main(String[] args) {

        //1.json字符串轉換爲對象
        String jsonString="{'name':'42313123','id':'2345','age':12}";
        JSONObject jsonObject = JSONObject.parseObject(jsonString);
        String id = jsonObject.getString("id");
        System.out.println(id);


        //2. JSONObject轉化成自定義類對象
        PeoplePo peoplePo1 = JSONObject.parseObject(jsonString, PeoplePo.class);
        System.out.println(peoplePo1);

        //3. JSONObject轉化成Map集合
        Map map = JSONObject.parseObject(jsonString, Map.class);
        System.out.println(map);

        //4. 自定義對象轉化成json格式的字符串
        PeoplePo peoplePo = new PeoplePo();
        peoplePo.setId("1");
        peoplePo.setAge(11);
        peoplePo.setName("LH");
        String peopleJson = JSON.toJSONString(peoplePo);
        System.out.println(peopleJson);

        //5. String類型轉化成JSONObject;
        String str = "{\"result\":\"success\",\"message\":\"成功！\"}";
        JSONObject jsonObject1 = JSONObject.parseObject(str);
        System.out.println(jsonObject1);

        //6. JSONObject轉化成JSONArray的兩種方式
        String str1 = "{\"result\":\"success\",\"message\":\"成功！\",\"data\":[{\"name\":\"Tom\",\"age\":\"20\"}]}";
        JSONObject jsonToArray = JSONObject.parseObject(str1);
        //方式一
        JSONArray data = jsonToArray.getJSONArray("data");
        System.out.println(data);
        //方式二
        JSONArray jsonArray = JSONArray.parseArray(jsonToArray.getString("data"));
        System.out.println(jsonArray);

        //7. jsonArray轉化成JSONObject並取出其中的元素數據
        JSONObject o = (JSONObject) jsonArray.get(0);
        String name = o.getString("name");
        System.out.println(o);
        System.out.println(name);
        System.out.println(jsonArray.toString());


    }
}