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

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