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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