java.net.ConnectException：连接超时：连接吗？

 import java.rmi.*;

 public interface AddServerIntf extends Remote {
  double add(double d1,double d2) throws RemoteException;
 }

import java.rmi.*;
import java.rmi.server.*;

public class AddServerImpl extends UnicastRemoteObject implements AddServerIntf {
  public AddServerImpl() throws RemoteException {
  }

 public double add(double d1,double d2) throws RemoteException {
  return d1+d2;
 }
}  

import java.net.*;
import java.rmi.*;

public class AddServer {
   public static void main(String args[]) {
    try {
     AddServerImpl addServerImpl=new AddServerImpl();
     Naming.rebind(\"AddServer\",addServerImpl);
    }  catch(Exception exc) {
          System.out.println(exc);
       }
   }
}

import java.rmi.*;
public class AddClient {
  public static void main(String args[]) {
     try {
       String Url=\"rmi://\"+args[0]+\"/AddServer\";
       AddServerIntf addServerIntf=(AddServerIntf)Naming.lookup(Url);
       System.out.println(\"The first number is \"+args[1]);
       double d1=Double.valueOf(args[1]).doubleValue();
       System.out.println(\"The second number is: \"+args[2]);
       double d2=Double.valueOf(args[2]).doubleValue();
       System.out.println(\"The Sum is: \"+addServerIntf.add(d1,d2));
     }  catch(Exception exc) {
         System.out.println(exc);
       }
   }
 }

rmic AddServerImpl

stub

java AddServer

java AddClient 27.60.200.80 5 9

java.net.ConnectException : connection timed out : connect

AddClient.class AddServerImpl.class AddServerImpl_Stub.class