Java RMI 連接被拒絕

Question

從策略文件：

permission java.net.SocketPermission "localhost:1024-", "listen, resolve";
permission java.net.SocketPermission "localhost:1099", "connect, resolve";
permission java.net.SocketPermission "localhost:1024-", "connect, resolve";
permission java.net.SocketPermission "localhost:1024-", "accept, resolve";

有這個代碼：

remoteObjName = "blabla";
final objectInterface engine = new object();
final Remote stub = UnicastRemoteObject.exportObject(engine, 0);
final Registry registry = LocateRegistry.getRegistry();
registry.rebind(remoteObjName, stub);//this line causes the exception.

什么可能導致此異常，在最后一行registry.rebind(remoteObjName, stub); ：

java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
        java.net.ConnectException: Connection refused: connect
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
        at sun.rmi.server.UnicastRef.newCall(Unknown Source)
        at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
        at app.ConnectionHandler$QAProbeRemote.startEngine(ConnectionHandler.java:47)
        at app.Main.<init>(Main.java:71)
        at app.Main$1.run(Main.java:49)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$000(Unknown Source)
        at java.awt.EventQueue$1.run(Unknown Source)
        at java.awt.EventQueue$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
    Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(Unknown Source)
        at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown Source)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown Source)
        ... 22 more

Answer 1

您尚未啟動注冊表，因此連接失敗。

Answer 2

您需要啟動在 JRE 文件夾中找到的“rmiregistry”注冊表。

例如，假設您的 JRE 文件夾位於：C:\\Program Files\\Java\\jre1.8.0_271\\bin

您可以轉到該文件夾​​並運行 rmiregistry.exe

rmir​​egistry.exe 將在控制台中運行。 把它留在后台。

如果您更喜歡通過 cmd 執行此操作，請按照以下步驟操作：

打開cmd，輸入：

cd C:\\Program Files\\Java\\jre1.8.0_271\\bin

按“Enter”，然后寫：

啟動 rmirregistry

並再次點擊“Enter”。