Java RMI服務器與客戶端通信不起作用

我正在開發一個使用服務器與套接字和RMI通信的遊戲。我對RMI相當陌生，在嘗試在不在同一臺PC上的服務器和客戶端之間進行通信時遇到了一些問題。在本地主機它工作無懈可擊，否則通信不能按預期工作。這裏是一些代碼片段：Java RMI服務器與客戶端通信不起作用

public RMIServer (ServerInterface mainServer){ 
    this.mainServer = mainServer; 
} 

public void startServer() throws IOException { 
    Registry registry = createOrLoadRegistry(Server.RMIPORT); 
    try { 
     System.out.println("Insert server ip address: "); 
     Scanner in = new Scanner(System.in); 
     String address = in.nextLine(); 
     in.close(); 
     System.setProperty("java.rmi.server.hostname", address); 
     registry.bind("RMIServerInterface", this); 
     UnicastRemoteObject.exportObject(this, Server.RMIPORT+1); 
    } catch (RemoteException | AlreadyBoundException e) { 
     System.err.println(e.getMessage()); 
    } 
}  

private Registry createOrLoadRegistry(int port) throws IOException{ 
    try { 
     System.out.println("creating register.. "); 
     return LocateRegistry.createRegistry(port); 
    } catch (RemoteException e) { 
     System.err.println(e.getMessage()); 
    } 
    try { 
     return LocateRegistry.getRegistry(port); 
    } catch (RemoteException e) { 
     System.err.println(e.getMessage()); 
    } 
    return null; 
}

插座的作品非常好，而不是。

編輯：爲了讓排在首位RMI工作，我被迫使用：

System.setProperty("java.rmi.server.hostname") 

enter code here

因爲服務器IP被隨機設置爲127.0.1.1（迴環）。我印在服務器端的堆棧跟蹤，這是結果：

creating register.. 
Insert server ip address: 
192.168.1.73 
Socket server is ready 
Recieved RMI client connection 
create first room.. 
cchvo has been added to room 
Number of players: 1 
java.rmi.ConnectException: Connection refused to host: 127.0.1.1; nested exception is: 
    java.net.ConnectException: Connessione rifiutata (Connection refused) 
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619) 
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) 
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) 
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:130) 
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227) 
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179) 
    at com.sun.proxy.$Proxy1.notifyNewPlayer(Unknown Source) 
    at server.RMIPlayer.notifyNewPlayer(RMIPlayer.java:28) 
    at server.Room.notifyNewPlayer(Room.java:147) 
    at server.Room.addPlayer(Room.java:106) 
    at server.Server.createRoom(Server.java:98) 
    at server.Server.addPlayerFirstAvailableRoom(Server.java:119) 
    at server.RMIServer.addRoom(RMIServer.java:82) 
    at server.RMIServer.loginPlayer(RMIServer.java:75) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346) 
    at sun.rmi.transport.Transport$1.run(Transport.java:200) 
    at sun.rmi.transport.Transport$1.run(Transport.java:197) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196) 
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:748) 
Caused by: java.net.ConnectException: Connessione rifiutata (Connection refused) 
    at java.net.PlainSocketImpl.socketConnect(Native Method) 
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) 
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) 
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) 
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) 
    at java.net.Socket.connect(Socket.java:589) 
    at java.net.Socket.connect(Socket.java:538) 
    at java.net.Socket.<init>(Socket.java:434) 
    at java.net.Socket.<init>(Socket.java:211) 
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40) 
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148) 
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613) 
    ... 30 more

來源

2017-07-04 user603334

*「...通信無法按預期工作」*：您從哪裏得到錯誤（在客戶端或服務器端）？你會得到什麼錯誤（帶有異常堆棧跟蹤）？如果您使用'e.printStackTrace（）'而不是'System.err.println（e.getMessage（））'，它會有所幫助。 –

我在帖子的服務器端添加了stackTrace。 – user603334

你正在做錯誤的順序一切。

Set java.rmi.server.hostname。
導出遠程對象。
創建註冊表。
將遠程對象綁定到註冊表。

來源

2017-07-04 21:56:08 EJP

它沒有幫助。謝謝 – user603334

我終於設法解決這個問題，只需在客戶端加入

System.setProperty ("java.rmi.server.hostname", clientIp)

了。希望能幫助有同樣問題的人。 PS：只有一臺PC（帶有Debian）超過3個主機名出現這個問題，其他運行Ubuntu和Windows的PC還沒有。感謝您的答案。

來源

2017-07-05 16:38:55 user603334

Java RMI服務器與客戶端通信不起作用

回答

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