阿里巴巴jsonObject的常用方法

开源社区的jsonObject的技术内幕：
https://link.csdn.net/?target=https%3A%2F%2Fwww.oschina.net%2Fquestion%2F54100_30041

多个json比较：
https://link.csdn.net/?target=https%3A%2F%2Fwww.cnblogs.com%2Fkunpengit%2Fp%2F4001680.html

步骤：
1.首先要在pom文件中引入 jar包

<!-- fastjson start -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>

2.User类：

package com.test.util;
 
/**
 * 用户表
 */
public class User  {
    private int id;
    private String name;
    public User(int id, String name) {
        this.id = id;
        this.name = name;
    }
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
}
 
 

3…jsonObject的常用方法：

//1.把json字符串转对象
private static void jsonToBean() {
    String jsonStr = "{\"id\":1001,\"name\":\"soup_tang\"}";
    User user = JSONObject.parseObject(jsonStr, User.class);
    System.out.println("id 为：---" + user.getId() + "名字为：--" + user.getName());
}
 
//2.将对象转json字符串
private static void beanToJson() {
    User user = new User(1, "CSDN博客");
    String jsonStr = JSONObject.toJSONString(user);
    System.out.println("对象转jsn字符串后的值为：--" + jsonStr);
}
 
//3.将多个对象字符串转对象的方法1
private static void jsonToListBean() {
    String jsonStr = "[{\"id\":1001,\"name\":\"soup_tang\"},{\"id\":1002,\"name\":\"csdn\"}]";
    List<User> list1 = JSONObject.parseObject(jsonStr, new TypeReference<List<User>>() {
    });
    list1.forEach(user -> System.out.println(user.getName()));
}
 
//3.将多个对象字符串转对象的方法2
private static void jsonToListBean1() {
    String jsonStr = "[{\"id\":1001,\"name\":\"soup_tang\"},{\"id\":1002,\"name\":\"csdn\"}]";
    List<User> users = JSONObject.parseArray(jsonStr, User.class);
    users.forEach(user -> System.out.println(user.getName()));
}
 
//4.将json字符串转化成jsonObject对象
private static void jsonToJsonObject() {
    String jsonStr = "{\"id\":1001,\"name\":\"Jobs\"}";
    JSONObject jsonObject = JSONObject.parseObject(jsonStr);
    System.out.println("id 为：---" + jsonObject.getString("id"));
}
 
//5.Map转Json字符串
private static void mapToJsonObject() {
    //将map转换成jsonObject
    Map<String,String> itemMap = new HashMap<String,String>();
    itemMap.put("1","soup_tang");
    JSONObject itemJsonObject = JSONObject.parseObject(JSON.toJSONString(itemMap));
    System.out.println("jsonObject--"+itemJsonObject.getString("1"));
 
}
//6.json字符串转Map
private static void jsonObjectToMap(){
    //将jsonObj转换成Map
    JSONObject itemJsonObject = new JSONObject();
    itemJsonObject.put("id","1");
    itemJsonObject.put("name","soup_tang");
    Map<String, Object> itemMap = JSONObject.toJavaObject(itemJsonObject, Map.class);
    for (Object s : itemMap.values()) {
        System.out.println("值为：----"+s);
    }
}