最近不少人都在问我关于fastjson的相关问题，今天这里介绍 fastjson 用于生成和解析 JSON 数据的简单示例，希望对大家有所帮助。

1.[代码][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; }

}

2. [代码][Java]代码

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; }

}

3. [代码]编码

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. [代码]输出结果

{

    "name":"admin",

    "id":0,"users":[

                           {"name":"guest","id":2},

                           {"name":"root","id":3}

                        ]

}

5. [代码]解码

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