JSP - 獲取類枚舉類型屬性時出錯

Question

我在我的JSP頁面中遇到了類屬性爲public enum的問題。我可以訪問除invite.status屬性以外的所有其他邀請類屬性。我做錯了什麼，但我不明白爲什麼它是錯誤的，我怎樣才能訪問我的返回列表的enum值。感謝您的幫助解決我的問題！

錯誤我得到類...domain.jpa.meeting.Invite'沒有屬性status。

這是JPA類，我有

@Entity 
public class Invite implements PersistentEntity { 

    @Id @GeneratedValue 
    private Long id; 

    @ManyToOne 
    private User inviter; 

    @ManyToOne 
    private User invitee; 

    @ManyToOne 
    private Meeting meeting; 

    /** 
    * Date when this invite has been created 
    */ 
    private Date created; 

//  @Column(nullable=false, length=1) 
// @Enumerated(EnumType.STRING) 
    private InviteStatus status; 

    public Long getId() { 
     return id; 
    } 

    public User getInviter() { 
     return inviter; 
    } 

    public void setInviter(User inviter) { 
     this.inviter = inviter; 
    } 

    public User getInvitee() { 
     return invitee; 
    } 

    public void setInvitee(User invitee) { 
     this.invitee = invitee; 
    } 

    public Meeting getMeeting() { 
     return meeting; 
    } 

    public void setMeeting(Meeting meeting) { 
     this.meeting = meeting; 
    } 

    public Date getCreated() { 
     return created; 
    } 

    public void setCreated(Date created) { 
     this.created = created; 
    } 

    public InviteStatus getInviteStatus() { 
     return status; 
    } 

    public void setInviteStatus(InviteStatus status) { 
     this.status = status; 
    } 
} 

這是枚舉類型的公共類，我有

/** 
* Values for tracking invite status 
*/ 
public enum InviteStatus { 

    // invite is created and invitee have not responded yet 
    CREATED, 

    // invitee accepted this invite 
    ACCEPTED, 

    // invitee declined this invite 
    DECLINED 
} 

我在數據庫這樣的方式保存（成功爲EnumType.ORDINAL）

// adding invites (table invite) 
Invite invite = new Invite(); 
invite.setInviter(creator); 
User invitee = jpaDAO.getById(User.class, Long.parseLong(friends[i])); 
invite.setInvitee(invitee); 
invite.setInviteStatus(InviteStatus.CREATED); //CREATED = 0, ACCEPTED = 1, .. 
Date dateNow = new Date(); //yyyy-MM-dd HH:mm:ss 
invite.setCreated(dateNow); 
Meeting meeting = jpaDAO.getById(Meeting.class, meetingId); 
invite.setMeeting(meeting); 
jpaDAO.save(invite); 

而我有一個方法，從數據庫檢索邀請。

@SuppressWarnings({ "unchecked", "null" }) 
public List<Invite> getUserInvites(Long userId){ 
// getting invites for current user with status CREATED 
Query query = jpaDAO.getEntityManager().createNamedQuery(JPQConst.InviteJpq.QUERY_GET_BY_USER); 
query.setParameter("userId", userId); 
List<Invite> invites = (List<Invite>) query.getResultList(); 
return invites; 
} 

內部控制器，它看起來像這樣：

/** 
* Display Notifications tab 
*/ 
@RequestMapping(value = "/home/notifications", method = RequestMethod.GET) 
public String displayNotifications(ModelMap model, HttpSession session) { 
    User user = getCurrentUser(session);   
    List<Invite> invites = notificationService.getUserInvites(user.getId()); 
    model.addAttribute("invites", invites); 
    return "home"; 
} 

方法本身的工作，我能夠訪問所有邀請的屬性字段內除外JSP狀態屬性。

<c:forEach var="meeting" items="${inviteeMeetings}"> 
    <c:forEach var="invite" items="${invites}"> 
     <c:choose> 
     <c:when test="${meeting.id == invite.meeting.id}"> 
      <tr> 
       <td width="150px" align="center"> 
        <c:out value="${meeting.startTime}" /> 
       </td> 
       <td width="396px"> 
        <a href="../meeting/${meeting.id}"><c:out value="${meeting.title}" /></a> 
       </td> 
       <td width="96px"> 
        <c:out value="${invite.status}" /> 
        <form action="../meeting/attendance" method="post"> 
         <input type="hidden" name="venue" value="${meeting.id}" /> 
         <input type="submit" name="attendance" value="attend" /> 
         <input type="submit" name="attendance" value="reject" /> 
        </form> 
       </td> 
      </tr> 
     </c:when> 
     </c:choose> 
    </c:forEach> 
</c:forEach> 

Answer 1

實際上，你的班級沒有這樣的屬性。它具有inviteStatus屬性。

public InviteStatus getInviteStatus() { 
    return status; 
} 

屬性基於吸氣劑。存儲數據的內部值的名稱不相關。