常用 json javabean 互转

JSONObject 与 JSONArray区别

JSONObject:

{
	"area": "武汉",
	"name": "张三",
	"age": 25
	}

JSONArray:

		[{
		“area”: “武汉”,
		“name”: “张三”,
		“age”: 25
		},
		{
		“area”: “深圳”,
		“name”: “李四”,
		“age”: 22
		}]

通俗来讲  JSONObject 是对象的json形式 JSONArry 是对象集合的JSON形式。

JSON 与javabean互转

JSON用阿里的fastjson 包

用例java对象

public class User {

    protected Long id;
    protected String account;
    protected String password;
    protected String name;
    protected boolean gender;
    protected String telephone;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", account='" + account + '\'' +
                ", password='" + password + '\'' +
                ", name='" + name + '\'' +
                ", gender=" + gender +
                ", telephone='" + telephone + '\'' +
                '}';
    }

    public boolean isGender() {
        return gender;
    }

    public void setGender(boolean gender) {
        this.gender = gender;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

1、javabean转json
方法一：通过java对象转成String再转成JSONObject

package com.handoop.gms.utils;

import com.alibaba.fastjson.JSONObject;
import com.handoop.gms.domain.User;

public class TestMain {
    public static void main(String []args){
        //先通过构造函数初始化一个对象
        User user=new User((long) 1,"admin","admin","张三",true,"123456");
        //先将java对象转为String类型
        String jsonString= JSONObject.toJSONString(user);
        //再将String类型转为JSONObject
        JSONObject jsonObject=JSONObject.parseObject(jsonString);
        System.out.println(jsonObject);
        //转为JSONObject后就可以随时根据键值获取他的元素了
        System.out.println(jsonObject.get("password"));

    }
}

运行结果

方法2：java对象直接转json

package com.handoop.gms.utils;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.handoop.gms.domain.User;

public class TestMain {
    public static void main(String []args){
        //先通过构造函数初始化一个对象
        User user=new User((long) 1,"admin","admin","张三",true,"123456");
        JSONObject jsonObject= (JSONObject) JSONObject.toJSON(user);
        System.out.println(jsonObject);
    }
}

运行结果

2. json字符串转JSONObeject

public class TestMain {
    public static void main(String []args){
       String str="{\"password\":\"admin\",\"gender\":true,\"name\":\"张三\",\"telephone\":\"123456\",\"id\":1,\"account\":\"admin\"}";
       JSONObject jsonObject=JSONObject.parseObject(str);
        System.out.println("account: "+jsonObject.get("account")+"---"+"paasword: "+jsonObject.get("password"));
    }
}

运行结果

3.jsonString 转JSONArray

public class TestMain {
    public static void main(String []args){

       String str="{\"data\":[{\"password\":\"admin\",\"gender\":true,\"name\":\"张三\",\"telephone\":\"123456\",\"id\":1,\"account\":\"admin\"}]}";
       //先转成JSONObject
       JSONObject jsonObject=JSONObject.parseObject(str);
       //再将JSONObject中数组类型数据取出转成JSONArray
       JSONArray jsonArray=jsonObject.getJSONArray("data");
        System.out.println(jsonArray.get(0));
    }
}

运行结果

4.JSON字符串转JAVA对象

            String str="{\"password\":\"admin\",\"gender\":true,\"name\":\"张三\",\"telephone\":\"123456\",\"id\":1,\"account\":\"admin\"}";
            // 前面是JSON字符串 后面是java对象类型
            User user=JSONObject.parseObject(str,User.class);
            System.out.println("account: "+user.getAccount()+"---"+"paasword: "+user.getPassword());

输出结果

转载：https://blog.csdn.net/zyz_YZJ/article/details/115443741