java实现多人聊天对话室

使用ServerSocket和Socket实现服务器端和客户端的Socket通信。

了解完socket通信步骤后可以发现本实验需要写两个类：Server和Client，并且要先运行Server再运行Client。

先构造服务器端

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
 
/**
 * @author: Ren
 * @date: 2020-08-03  15:23
 * @description:
 */
public class TcpserverC2 {
    public static void main(String[] args) throws IOException {
//        定义多线程，让多个用户都可以参与到聊天室
        ExecutorService pool = new ScheduledThreadPoolExecutor(10);
//        绑定端口
        ServerSocket serverSocket = new ServerSocket(8888);
//        利用循环一直来读取新的socket
        while (true) {
//            开始serversocket侦听请求，这方法会阻塞等待tcp请求的到来，一旦到来，就返回
            Socket accept = serverSocket.accept();
            pool.execute(new Runnable() {
                Socket socket = accept;
//                定义字节数组来读取输入流
                byte[] buf = new byte[1024];
                @Override
                public void run() {
//                    定义输入输出流
                    InputStream in = null;
                    OutputStream out = null;
                    try {
                        in = socket.getInputStream();
                        out = socket.getOutputStream();
                        while (true) {
                            int len = in.read(buf);
                            System.out.println("服务器收到：" + new String(buf, 0, len, ("utf-8")));
                            // 聊天室服务端一般不会参与对话，所以一般不加这个功能
//                            String xitongshuohua = scanner.nextLine();
//                            out.write("谢谢".getBytes(Charset.forName("utf-8")));
                            out.write("谢谢".getBytes(("utf-8")));
 
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}

再构建客户端

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;
 
/**
 * @author: Ren
 * @date: 2020-08-03  15:23
 * @description:
 */
public class TcpClientC2 {
    public static void main(String[] args) throws IOException {
//        目标地址，目标端口
        Socket socket = new Socket("127.0.0.1",8888);
        InputStream in = socket.getInputStream();
        OutputStream out = socket.getOutputStream();
        Scanner scanner = new Scanner(System.in);
        byte[] buf = new byte[1024];
        while (true) {
            String word = scanner.nextLine();
            out.write(word.getBytes(("utf-8")));
            int lrn = in.read(buf);
            System.out.println("服务端回复："+new String(buf,0,lrn,("utf-8")));
        }
    }
}

服务器端构建在一个主机上，然后在多台电脑创建客户端，并访问服务器端所在的主机就可以构成聊天室的效果，当然前提是在同一个局域网下。

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