com.sun.proxy.$Proxy0 无法转换为

Question

我有以下 RMI 连接代码，其中 returns 出现 com.sun.proxy.$Proxy0 无法转换为 Client.AdditionInterface 错误。我创建了两个单独的包客户端和服务器，并将接口放入其中。这是我的完整代码：

package Serveur;
import java.rmi.*;
import java.rmi.registry.LocateRegistry; 

public class AdditionServer {

public static void main (String[] argv) {
    try {
        LocateRegistry.createRegistry(1099);     
        Addition Hello = new Addition();     
        Naming.rebind("rmi://"+java.net.InetAddress.getLocalHost().getHostName()+"/ABC", Hello);     
        System.out.println("Addition Server is ready.");
    }
    catch (Exception e) {
        System.out.println("Addition Server failed: " + e);
    }
}
}

///////////////////////////////////

package Serveur;
 import java.rmi.*;
import java.rmi.server.*;


public class Addition extends UnicastRemoteObject implements AdditionInterface {

public Addition () throws RemoteException {
    super(); 
}

@Override
public int add(int a, int b) throws RemoteException {
    int result=a+b;
    return result;
}

@Override
public String aff(int a, int b) throws RemoteException {
    return String.valueOf(add(a, b));

}
}

///////////////////////////

package Client;

import java.rmi.Remote;
import java.rmi.RemoteException;

 public interface AdditionInterface extends Remote {
     public int add(int a,int b) throws RemoteException;
     public String aff(int a, int b) throws RemoteException;
 }

///////////////////////////

package Client;
import java.rmi.*;


public class AdditionClient {
    public static void main (String[] args) throws Exception {      
        AdditionInterface add = (AdditionInterface) Naming.lookup("rmi://"+java.net.InetAddress.getLocalHost().getHostName()+"/ABC");
        System.out.println("Result is :"+add.add(9, 10));
        System.out.println(add.aff(26, 45));
    }
}

有什么帮助吗？谢谢。

Answer 1

对于客户端的 Client.AdditionInterface 和服务器的 Server.AdditionInterface？实际上错误是说 Server.AdditionInterface cannot be cast to Client.AdditionInterface.

使用 RMI，您必须在客户端和服务器上具有相同的接口 class，但显然服务器实现 class (AdditionServer) 仅在服务器上。该接口可以在共享包中（例如 common.AdditionInterface ）。

com.sun.proxy.$Proxy0 无法转换为

com.sun.proxy.$Proxy0 cannot be cast to

java

eclipse

rmi