handeling java RMI連接拒絕主機異常

Question

如果服務器未啓動，我想向用戶顯示錯誤消息。 當用戶啓動程序時。 下面我提到了我用來連接到服務器的應用程序的我的ServerConnector單例類。

public class ServerConnector { 



private static ServerConnector serverConnector; 
    private RemoteFactory remoteFactory; 

    private ServerConnector() throws NotBoundException, MalformedURLException, 
      RemoteException { 
     remoteFactory = (RemoteFactory) Naming 
       .lookup("rmi://localhost:5050/RoomReservation"); 
    } 

    public static ServerConnector getServerConnector() 
      throws NotBoundException, MalformedURLException, RemoteException { 
     if (serverConnector == null) { 
      serverConnector = new ServerConnector(); 
     } 
     return serverConnector; 
    } 

    public CustomerController getCustomerController() throws RemoteException { 
     return remoteFactory.getCustomerController(); 
    } 


} 

有沒有什麼辦法在加載程序的GUI之前檢查服務器是否啓動？

謝謝。

Answer 1

• Catch java.rmi.ConnectException。這意味着註冊表尚未啓動。

• Catch NotBoundException。這意味着服務器尚未綁定到註冊表。