使用FastJSON，将对象或数组和JSON串互转

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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/alibaba/fastjson。
示例代码如下：

package com.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("转换为json格式:");        System.out.println("jsonString:" + jsonString);        // JSON串转用户组对象        UserGroup group2 = JSON.parseObject(jsonString, UserGroup.class);//      System.out.println("对象："+group2.getUsers().get(0));//      System.out.println("对象："+group2.getUsers().get(1));        System.out.println("转换为json对象：");        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("数组转为json：");        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("json转为数组：");        System.out.println("users2:" + users2);    }}

输出如下：

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]]

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