使用来自同一表的两个外键休眠-注释

请求是针对主机的，并且是来自访客的，因此，您仅需要从请求到用户就有2个ManyToOne关联：

@Entitypublic class Request {    @Id    @Column(name = "req_id")    private Long id;    @ManyToOne    @JoinColumn(name = "visitor_id")    private User visitor;    @ManyToOne    @JoinColumn(name = "host_id")    private User host;    // ...}

如果要使这些关联是双向的，则只需在用户中需要相应的集合：

@Entityprivate class User {        @oneToMany(mappedBy = "host")    private Set<Request> hostRequests = new HashSet<>();        @oneToMany(mappedBy = "visitor")    private Set<Request> visitorRequests = new HashSet<>();    // ...}