java - 如何使用 Java 中的聊天应用程序连接网络上的 2 台不同计算机？

Question

我有一对简单的客户端和服务器程序。客户端连接到服务器，当连接成功时，服务器会回复一条“Hello there”消息。如果我想让客户端程序和服务器程序运行在不同的系统上，我应该如何修改程序？

这是客户端的代码..

package practice;

import java.io.*;
import java.net.*;

public class DailyAdviceClient
{
    public static void main(String args[])
    {
        DailyAdviceClient dac = new DailyAdviceClient();
        dac.go();
    }

    public void go()
    {
        try
        {
            Socket incoming = new Socket("127.0.0.1",4242);
            InputStreamReader stream = new InputStreamReader(incoming.getInputStream());
            BufferedReader reader = new BufferedReader(stream);
            String advice = reader.readLine();
            reader.close();
            System.out.println("Today's advice is "+advice);
        }
        catch(Exception e)
        {
            System.out.println("Client Side Error");
        }
    }
}

这是服务器的代码

package practice;

import java.io.*;
import java.net.*;

public class DailyAdviceServer
{
    public static void main(String args[])
    {
        DailyAdviceServer das = new DailyAdviceServer();
        das.go();
    }

    public void go()
    {
        try
        {
            ServerSocket serversock = new ServerSocket(4242);

            while(true)
            {
                Socket outgoing = serversock.accept();
                PrintWriter writer = new PrintWriter(outgoing.getOutputStream());
                writer.println("Hello there");
                writer.close();

            }
        }
        catch(Exception e)
        {
            System.out.println("Server Side Problem");
        }
    }
}

Answer 1

只需将客户端上的“127.0.0.1”更改为服务器的 IP，并确保端口 4242 已打开。