介紹幾種JSON和Javabean互轉(zhuǎn)的常用方法 Java代碼實(shí)現(xiàn)

JSON因?yàn)槠鋸?qiáng)大特性的原因，是現(xiàn)階段web開(kāi)發(fā)中前后端交互的最主要的數(shù)據(jù)格式。后端開(kāi)發(fā)中經(jīng)常使用到Javabean，因此時(shí)常需要將JSON和Javabean進(jìn)行互相轉(zhuǎn)換。本文將為您介紹幾種關(guān)于如何應(yīng)用 Java 語(yǔ)言來(lái)實(shí)現(xiàn)轉(zhuǎn)換JSON和Javabean的常用方法。

JSONObject 與 JSONArray區(qū)別

JSONObject:

{
	"area": "武漢",
	"name": "張三",
	"age": 25
	}

JSONArray:

[{
		“area”: “武漢”,
		“name”: “張三”,
		“age”: 25
		},
		{
		“area”: “深圳”,
		“name”: “李四”,
		“age”: 22
		}]

通俗來(lái)講 JSONObject 是對(duì)象的json形式 JSONArry 是對(duì)象集合的JSON形式。

JSON 與javabean互轉(zhuǎn)

JSON用阿里的fastjson 包

用例java對(duì)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轉(zhuǎn)json

方法一：通過(guò)java對(duì)象轉(zhuǎn)成String再轉(zhuǎn)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){
  //先通過(guò)構(gòu)造函數(shù)初始化一個(gè)對(duì)象
  User user=new User((long) 1,"admin","admin","張三",true,"123456");
  //先將java對(duì)象轉(zhuǎn)為String類型
  String jsonString= JSONObject.toJSONString(user);
  //再將String類型轉(zhuǎn)為JSONObject
  JSONObject jsonObject=JSONObject.parseObject(jsonString);
  System.out.println(jsonObject);
  //轉(zhuǎn)為JSONObject后就可以隨時(shí)根據(jù)鍵值獲取他的元素了
  System.out.println(jsonObject.get("password"));

 }
}

運(yùn)行結(jié)果

方法2：java對(duì)象直接轉(zhuǎn)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){
  //先通過(guò)構(gòu)造函數(shù)初始化一個(gè)對(duì)象
  User user=new User((long) 1,"admin","admin","張三",true,"123456");
  JSONObject jsonObject= (JSONObject) JSONObject.toJSON(user);
  System.out.println(jsonObject);
 }
}

運(yùn)行結(jié)果

json字符串轉(zhuǎn)JSONObeject

public class TestMain {
 public static void main(String []args){
  String str="{"password":"admin","gender":true,"name":"張三","telephone":"123456","id":1,"account":"admin"}";
  JSONObject jsonObject=JSONObject.parseObject(str);
  System.out.println("account: "+jsonObject.get("account")+"---"+"paasword: "+jsonObject.get("password"));
 }
}

運(yùn)行結(jié)果

3.jsonString 轉(zhuǎn)JSONArray

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

  String str="{"data":[{"password":"admin","gender":true,"name":"張三","telephone":"123456","id":1,"account":"admin"}]}";
  //先轉(zhuǎn)成JSONObject
  JSONObject jsonObject=JSONObject.parseObject(str);
  //再將JSONObject中數(shù)組類型數(shù)據(jù)取出轉(zhuǎn)成JSONArray
  JSONArray jsonArray=jsonObject.getJSONArray("data");
  System.out.println(jsonArray.get(0));
 }
}

運(yùn)行結(jié)果

4.JSON字符串轉(zhuǎn)JAVA對(duì)象

   String str="{"password":"admin","gender":true,"name":"張三","telephone":"123456","id":1,"account":"admin"}";
   // 前面是JSON字符串 后面是java對(duì)象類型
   User user=JSONObject.parseObject(str,User.class);
   System.out.println("account: "+user.getAccount()+"---"+"paasword: "+user.getPassword());

輸出結(jié)果

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