使用FastJSON，将对象或数组和JSON串互转

示例代码如下：

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：

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

（编辑：李大同）

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