这里介绍 fastjson 用于生成和解析 JSON 数据的简单示例

1、Java代码

public class User {
	private Long id;
	private String name;

	public Long getId() { return id; }
	public void setId(Long id) { this.id = id; }

	public String getName() { return name; }
	public void setName(String name) { this.name = name; }
}

public class Group {
	private Long id;
	private String name;
	private List<User> users = new ArrayList<User>();

	public Long getId() { return id; }
	public void setId(Long id) { this.id = id; }

	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; }
}

import com.alibaba.fastjson.JSON;

Group group = new Group();
group.setId(0L);
group.setName("admin");

User guestUser = new User();
guestUser.setId(2L);
guestUser.setName("guest");

User rootUser = new User();
rootUser.setId(3L);
rootUser.setName("root");

group.getUsers().add(guestUser);
group.getUsers().add(rootUser);

String jsonString = JSON.toJSONString(group);

System.out.println(jsonString);

4、输出结果

{
      "name":"admin","id":0,"users":[
                             {"name":"guest","id":2},{"name":"root","id":3}
                         ]
}

Group group2 = JSON.parSEObject(jsonString,Group.class);