JAVA(多人聊天室) 最简单的控制台输出版，NIO单线程服务器，双线程客户端，妈妈再也不担心我不会写聊天室了

JAVA(多人聊天室) 最简单的控制台输出版，NIO单线程服务器，双线程客户端，妈妈再也不担心我不会写聊天室了。

一、惯例先上效果图：

二、代码（开袋即食）
2.1 服务端

public class NIOServer {
    static List<SocketChannel> channelList = new ArrayList<>();

    public static void main(String[] args) {
        try {
            //ServerSocket serverSocket = new ServerSocket(8888);
            ServerSocketChannel serverSocket = ServerSocketChannel.open();
            SocketAddress socketAddress = new InetSocketAddress(8888);
            serverSocket.bind(socketAddress);
            serverSocket.configureBlocking(false);

            System.out.println("启动服务器。。。。");
            while (true) {
                //Socket clientSocket = serverSocket.accept();
                ByteBuffer byteBuffer = ByteBuffer.allocate(1024);

                // for (SocketChannel socketChannel : channelList) {
                for (int i = 0; i < channelList.size(); i++) {
                    if (channelList.get(i).finishConnect()){
                        int read = 0;
                        try {
                            read = channelList.get(i).read(byteBuffer);
                        } catch (IOException e) {
                            System.out.println("客户端断开连接了");
                            channelList.remove(i);
                        }

                        if (read > 0) {
                            byteBuffer.flip();
                            byte[] bs = new byte[read];
                            byteBuffer.get(bs);
                            String content = new String(bs);
                            System.out.println(content);
                            for (int j = 0; j < channelList.size(); j++){
                                channelList.get(j).write(byteBuffer.wrap(bs));
                            }
                            byteBuffer.flip();
                        } else if (read == -1) {
                            channelList.remove(i);
                        }
                    }
                }

                //循环等待连接
                SocketChannel accept = serverSocket.accept();

                if (accept != null) {
                    System.out.println("连接成功！");

                    accept.configureBlocking(false);
                    channelList.add(accept);
                    System.out.println("当前服务器连接数为:" + channelList.size());
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2.2 客户端

public class Client {
    static Socket socket;

    private static void acceptMessage(Socket socket){
        try {
            while (true){
                byte[] bytes = new byte[1024];
                socket.getInputStream().read(bytes);
                System.out.println(new String(bytes));
            }
        } catch (IOException e) {

        }
    }

    private static void sendMessage(Socket socket){
        try {
            Scanner sc = new Scanner(System.in);
            System.out.print("请输入您聊天室的昵称：");
            String str = sc.nextLine();
            System.out.println(str + "欢迎来到聊天室！");
            while (true){
                String s = str + ":" +  sc.nextLine();
                if(str.contains("exit")){
                    System.out.println("断开连接！");
                    break;
                }

                socket.getOutputStream().write(s.getBytes());
            }
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    static class Tread01 extends Thread{
        public void run(){
            sendMessage(socket);
        }
    }

    static class Tread02 extends Thread{
        public void run(){
            acceptMessage(socket);
        }
    }

    public static void main(String[] args) {
        try {
            socket = new Socket("localhost", 8888);
            Tread01 t1 = new Tread01();
            Tread02 t2 = new Tread02();
            t1.start();
            t2.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

本文地址：https://blog.csdn.net/weixin_44197478/article/details/107394195