Java网络编程Demo，使用TCP 实现简单群聊功能Groupchat，创建一个服务端，使多个客户端都能收到消息

客户端类

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class SocketServer {
	public static List<Socket> socketList=new ArrayList<Socket>(); 
	public static void main(String[] args) throws IOException {
		ServerSocket serverSocket = new ServerSocket(8088);
		System.out.println("聊天服务已开启");
		while(true){
			//当客户端发出请求，服务端建立的通向客户端的专属通道
			Socket socket = serverSocket.accept();
			socketList.add(socket);
			new Thread(new ServerThread(socket)).start();
		}
	}
}

服务器线程类

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

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

	@Override
	public void run() {
		try {
			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			
			while (true) {
				String readLine = bufferedReader.readLine();
				for (Socket item : SocketServer.socketList) {
					PrintWriter pw=new PrintWriter(item.getOutputStream());
					pw.println("用户"+socket.getPort()+"说"+readLine);
					pw.flush();
				}
			}
		} catch (Exception e) {
		}
	}
	
}

读取的线程类

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

public class ReaderThread implements Runnable{
	public Socket socket;
	
	public ReaderThread(Socket socket) {
		super();
		this.socket = socket;
	}

	@Override
	public void run() {
		try {
			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			while (true) {
				String data=bufferedReader.readLine();
				System.out.println(data);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
}

写出的线程类

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class WriterThread implements Runnable{
	public Socket socket;
	
	public WriterThread(Socket socket) {
		super();
		this.socket = socket;
	}

	@Override
	public void run() {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			PrintWriter printWriter = new PrintWriter(socket.getOutputStream());
			while (true) {
				String data=br.readLine();
				printWriter.println(data);
				printWriter.flush();
			}
		} catch (Exception e) {

		}
	}
	
}

客户端类

import java.io.IOException;
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",8088);
		System.out.println("您已上线");
		new Thread(new WriterThread(socket)).start();
		new Thread(new ReaderThread(socket)).start();
	}
}