[英]Java RMI only working localhost
我正在使用瘦RMI客戶端,但是當我嘗試從除本地主機以外的任何計算機連接到它時,它會獲得拒絕的連接堆棧跟蹤。 我確認防火牆已關閉。 我還需要做什么。 我需要為RMI配置安全性嗎?
Server.java
package com.ibm.icm.autoconfig.server.rmi;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.ExportException;
import java.rmi.server.UnicastRemoteObject;
public final class Server extends Commands implements ServerHook {
private Registry registry;
public static void main(String[] args) throws RemoteException {
Server server = new Server();
server.Start();
}
private void Start() throws RemoteException {
ServerHook serverHook = (ServerHook) UnicastRemoteObject.exportObject(this, 0);
// Add serverHook to the local registry -- attempt to create registry
// instance, if it fails to create, try finding an existing one
try {
registry = LocateRegistry.createRegistry(1099);
} catch (ExportException ee) {
registry = LocateRegistry.getRegistry(1099);
}
registry.rebind("ServerHook", serverHook);
System.out.println("Server Running...");
while (true) {
}
}
}
ServerHook.java
package com.ibm.icm.autoconfig.server.rmi;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface ServerHook extends Remote {
public boolean write(String msg) throws RemoteException;
}
Client.java
package com.ibm.icm.autoconfig.client.rmi;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import com.ibm.icm.autoconfig.server.rmi.ServerHook;
public class Client {
private ServerHook serverHook;
public static void main(String[] args) throws RemoteException, NotBoundException {
Client client = new Client();
client.connectTo("localhost");
client.writeServer("Hello Server!");
}
private void connectTo(String serverHost) throws RemoteException, NotBoundException {
Registry registry = LocateRegistry.getRegistry();
serverHook = (ServerHook) registry.lookup("ServerHook");
}
private void writeServer(String msg) throws RemoteException {
serverHook.write(msg);
}
}
非本地RMI的Stacktrace:
Exception in thread "main" java.rmi.ConnectException: Connection refused to host: 9.65.186.135; 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.lookup(Unknown Source)
at com.ibm.icm.autoconfig.client.rmi.Client.connectTo(Client.java:21)
at com.ibm.icm.autoconfig.client.rmi.Client.main(Client.java:15)
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)
... 7 more
這是因為下面的客戶端代碼:
client.connectTo("localhost"); --> Client tries to connect to itself. Wrong
這應該更改為:
client.connectTo(serverHost);
其中serverHost是運行服務器代碼的計算機的地址
我在這里找到了問題。 它類似於Suraj Chandran的建議。
private void connectTo(String serverHost) throws RemoteException, NotBoundException {
Registry registry = LocateRegistry.getRegistry();
serverHook = (ServerHook) registry.lookup("ServerHook");
}
條目LocateRegistry.getRegistry()
實際上使我的客戶端指向其自己的注冊表。 正確的代碼是:
private void connectTo(String **serverHost**) throws RemoteException, NotBoundException {
Registry registry = LocateRegistry.getRegistry(**serverHost**);
serverHook = (ServerHook) registry.lookup("ServerHook");
}
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