我运行下面的 rmi 程序，但它显示命令执行失败

Posted 2023-02-25

【中文标题】我运行下面的 rmi 程序，但它显示命令执行失败

【英文标题】：i run the rmi program below but it shows command execution failed

【发布时间】：2021-12-26 09:15:02

【问题描述】：

这个程序应该从客户端向服务器发送一条文本消息。我完成了编译文件。 server.java 运行成功，但 client.java 显示错误。 错误列表太长，所以我只截图了几行。

这是代码ReceiverMessageInterface.java

package com.mycompany.dsa3;
import java.rmi.*;

public interface ReceiveMessageInterface extends Remote
  void receiveMessage(String x) throws RemoteException;

RmiServer.java

package com.mycompany.dsa3;
import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
import java.net.*;

public class RmiServer extends 
  java.rmi.server.UnicastRemoteObject implements ReceiveMessageInterface
  String address;
  Registry registry; 

  public void receiveMessage(String x) throws RemoteException
  System.out.println(x);
  
  
  public RmiServer() throws RemoteException
  try  
  address = (InetAddress.getLocalHost()).toString();
  
  catch(Exception e)
  System.out.println("can't get inet address.");
  
  int port=3232; 
  System.out.println("this address=" + address +  ",port=" + port);
  try
  registry = LocateRegistry.createRegistry(port);
  registry.rebind("rmiServer", this);
  
  catch(RemoteException e)
  System.out.println("remote exception"+ e);
  
  
  static public void main(String args[])
  try
  RmiServer server = new RmiServer();
  
  catch (Exception e)
  e.printStackTrace();
  System.exit(1);
  
  

RmiClient.java

package com.mycompany.dsa3;
import java.rmi.*;
import java.rmi.registry.*;
import java.net.*;

public class RmiClient
  static public void main(String args[])
  ReceiveMessageInterface rmiServer;
  Registry registry;
  String serverAddress=args[0];
  String serverPort=args[1];
  String text=args[2];
  System.out.println    ("sending " + text + " to " +serverAddress + ":" + serverPort);
  try
  registry=LocateRegistry.getRegistry
  (serverAddress,(new Integer(serverPort)).intValue());
  rmiServer=(ReceiveMessageInterface)(registry.lookup("rmiServer"));
  // call the remote method
  rmiServer.receiveMessage(text);
  
  catch(RemoteException e)
  e.printStackTrace();
  
  catch(NotBoundException e)
  System.err.println(e);
  
  
  

请帮助我更正代码。谢谢

【问题讨论】：

这与rmi无关。

【参考方案1】：

从 args 数组中读取元素时似乎发生了错误。 请检查您传递的参数的长度。 在从中读取元素之前，我们还应该始终检查 args[] 的长度。 请参阅下面的链接和答案 What is "String args[]"? parameter in main method Java