Java 用Jackson进行json和object之间的转换

Java 用Jackson进行json和object之间的转换

1.Jackson依赖

<dependency>  
    <groupId>com.fasterxml.jackson.core</groupId>  
    <artifactId>jackson-databind</artifactId>  
    <version>2.8.3</version>  
</dependency> 

创建一个user对象

package com.liu.entity;

/**
 * @author: LYJ
 * @className: User
 * @description:
 * @date :2023/10/21 10:49
 * @version: 0.1
 * @since: jdk11
 */
public class User {
    private Integer id;
    private String userName;
    private String password;

  //set、get、toString方法
}

2.java对象与json字符串的互转

1. java对象转jsonAPI：writeValueAsString()
2. json对象转换为java对象API:readValue()

public class MainApplication {
    public static void main(String[] args) throws JsonProcessingException {
        ObjectMapper objectMapper = new ObjectMapper();
        User user = new User();
        user.setId(110);
        user.setUserName("刘");
        user.setPassword("123456");
        //java对象转json
        String userJson = objectMapper.writeValueAsString(user);
        System.out.println("userJson = " + userJson);
        //json对象转换为java对象
        User user1 = objectMapper.readValue(userJson, User.class);
        System.out.println("user1 = " + user1);
        /*
        打印输出
        userJson = {"id":110,"userName":"刘玉杰","password":"123456"}
		user1 = User{id=110, userName='刘玉杰', password='123456'}
        */
    }
}