java获取json中某个字段

骑猪看日落 2023-10-01 02:29 119阅读 0赞

import com.alibaba.fastjson.JSONObject;
    public class JsonTest {
        
        public static void main(String[] args) {
        
            // json串(以自己的为准)
            String str = "{"id":"75","shoppingCartItemList":[{"id":"407","num":"10"}]}";
            JSONObject jsonObject = JSONObject.parseObject(str);
            // 获取到key为shoppingCartItemList的值
            String r = jsonObject.getString("shoppingCartItemList");
            System.out.println(r);
        }
    }
    package com.cmbc.cms.action.addrebatchno;
    
            import java.util.List;
    
            import com.alibaba.fastjson.JSONObject;
    
    public class Test {
        
    
        public int getId() {
        
            return id;
        }
    
        public void setId(int id) {
        
            this.id = id;
        }
    
        public int getNum() {
        
            return num;
        }
    
        public void setNum(int num) {
        
            this.num = num;
        }
    
        private int id;
        private int num;
    
        public static void main(String[] args) {
        
    // TODO Auto-generated method stub 
            String str = "{\"id\":\"75\",\"shoppingCartItemList\":[{\"id\":\"407\",\"num\":\"10\"}]}";
            JSONObject jsonObject = JSONObject.parseObject(str);
    // 获取到key为shoppingCartItemList的值 
            String r = jsonObject.getString("shoppingCartItemList");
            System.out.println(r);
    
    //取外面的id 
            String id = jsonObject.getString("id");
            System.out.println(id);
    
    //取里面的id 
            List<Test> list = JSONObject.parseArray(r,Test.class);
            int id2 = list.get(0).getId();
            System.out.println(id2);
    
        }
    
    }