使用FastJSON，将对象或数组和JSON串互转

Fastjson，是阿里巴巴提供的一个Java语言编写的高性能功能完善的JSON库。
其开源的下载网址为：https://github.com/AlibabaTech/fastjson。

示例代码如下：

[java] view plaincopy





package test;

import java.util.ArrayList;

import java.util.List;

import com.alibaba.fastjson.JSON;

class User {

private String name;

private int age;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

@Override

public String toString() {

return "User [name=" + name + ", age=" + age + "]";

}

};

class UserGroup {

private String name;

private List<User> users = new ArrayList<User>();

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public List<User> getUsers() {

return users;

}

public void setUsers(List<User> users) {

this.users = users;

}

@Override

public String toString() {

return "UserGroup [name=" + name + ", users=" + users + "]";

}

}

class FastJsonTest {

public static void main(String[] args) {

// 构建用户geust

User guestUser = new User();

guestUser.setName("guest");

guestUser.setAge(28);

// 构建用户root

User rootUser = new User();

rootUser.setName("root");

guestUser.setAge(35);

// 构建用户组对象

UserGroup group = new UserGroup();

group.setName("admin");

group.getUsers().add(guestUser);

group.getUsers().add(rootUser);

// 用户组对象转JSON串

String jsonString = JSON.toJSONString(group);

System.out.println("jsonString:" + jsonString);

// JSON串转用户组对象

UserGroup group2 = JSON.parseObject(jsonString, UserGroup.class);

System.out.println("group2:" + group2);

// 构建用户对象数组

User[] users = new User[2];

users[0] = guestUser;

users[1] = rootUser;

// 用户对象数组转JSON串

String jsonString2 = JSON.toJSONString(users);

System.out.println("jsonString2:" + jsonString2);

// JSON串转用户对象列表

List<User> users2 = JSON.parseArray(jsonString2, User.class);

System.out.println("users2:" + users2);

}

}

输出如下：

[html] view plaincopy





jsonString:{"name":"admin","users":[{"age":35,"name":"guest"},{"age":0,"name":"root"}]}

group2:UserGroup [name=admin, users=[User [name=guest, age=35], User [name=root, age=0]]]

jsonString2:[{"age":35,"name":"guest"},{"age":0,"name":"root"}]

users2:[User [name=guest, age=35], User [name=root, age=0]]