常用json与javabean互转的方法实现

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

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

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