Question

当我使用类文件测试RMI客户端和服务器时，它在两台不同的计算机上运行时没有任何问题。现在当我用jar做同样的事情时，客户端无法连接到服务器上的RMIRegistry。然后当我在同一台机器上测试jar时，客户端可以连接到服务器（甚至通过网络ip而不是localhost）。

我怀疑这与RMI注册表有关，但我是RMI的新手，所以我不知道......

我创建了一个像这样的RMIRegistry：

rmiregistry = LocateRegistry.createRegistry(ServiceConstraints.REGISTRY_PORT);
rmiService = (RmiSubjectService) UnicastRemoteObject.exportObject(this,
                    ServiceConstraints.REGISTRY_PORT);
rmiregistry.rebind("RmiService", rmiService);

客户端连接如下：

remoteService = (RmiSubjectService) Naming.lookup("/" + host + ":"+ port + "/RmiService");

使用jar运行时我在客户端上遇到的错误：

java.rmi.ConnectException: Connection refused to host: 192.168.2.132; nested exception is:
        java.net.ConnectException: Connection timed out: 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.lookup(Unknown Source)
        at java.rmi.Naming.lookup(Unknown Source)
        at ch.uzh.ifi.group10.client.Client.subscribe(Client.java:148)
        at ch.uzh.ifi.group10.client.Client.main(Client.java:242)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa
der.java:58)
Caused by: java.net.ConnectException: Connection timed out: 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 S
ource)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown S
ource)
        ... 13 more

Answer 1

问题确实变成了网络。具体来说，我没有意识到我的防火墙阻塞了套接字，所以我无法连接。

具有类文件的RMI可用，但不适用于jar

1 个答案: