将json对象作为hashset使用到json数组的类中

问题是,如何将json对象中的数组自动读取到权限集?

我试图将rest body中接收到的json对象转换为USER类的对象:

public class User {
    public String userid;
    public String password;
    private String fullname;
    private String email;
    private String websettings;
    private String productionlines;
    private String language;
    private String statustracking;
    private String createdate;
    public Set<Authority> authorities;
}

Authority.java版本:

public final class Authority implements Serializable {


    private String authority;
    private String userid;

    public Authority(String authority, String userid) {
        this.authority = authority;
        this.userid = userid;
    }}

这是我得到的json对象:

{
   "userid":"xx.xx",
   "password":"",
   "fullname":"asdfasdf",
   "email":"ali@sdf.com",
   "websettings":"this is setting",
   "productionlines":"production lines.",
   "createdate":"1234345",
   "statustracking":"status tracking...",
   "authorities" : [
    "user", "admin"
    ]
}

我就是这么吃的:

   public User createUser(@Valid @RequestBody User user) {
        return userService.createUser(user.getUserid(), user.password, user.getFullname(), user.getEmail(), null, getUserAuthorities(user));
    }