Java网络编程Demo，使用TCP 实现简单群聊功能GroupchatSimple，多个客户端输入消息，显示在服务端的控制台

效果：

服务端

客户端

实现代码：

服务端

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketServer {
	public static void main(String[] args) throws IOException {
		ServerSocket server = new ServerSocket(8888);
		System.out.println("群聊聊天室开启...");
		//定义初始上线人数为0
		int i=0;
		while (true) {
			Socket socket = server.accept();
			i++;
			System.out.println("上线通知："+socket.getInetAddress()+":"+socket.getPort());
			//读（使用多线程实现读的功能）
			new Thread(new ServerThread(socket)).start();
			System.out.println("目前上线人数"+i+"人");
		}
	}
}

线程类

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

public class ServerThread implements Runnable{
	public Socket socket;

	public ServerThread(Socket socket) {
		super();
		this.socket = socket;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		try {
			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			while (true) {
				String readLine = bufferedReader.readLine();
				System.out.println(readLine);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

客户端

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class SocketClient {
	public static void main(String[] args) throws UnknownHostException, IOException {
		Socket socket = new Socket("127.0.0.1",8888);
		System.out.println("您好吕布，您已经上线了");
		//构建从控制台输入的输入流
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		//构建从客户端输出的输出流
		PrintWriter pw=new PrintWriter(socket.getOutputStream());
		while (true) {
			pw.println("吕布说："+br.readLine());
			pw.flush();
		}
	}
}