简单模拟聊天

服务器端：代码展示

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(8888);   //创建服务器端口号
        ExecutorService service = Executors.newCachedThreadPool();  //创建线程池
        ConcurrentHashMap<Socket, SocketAddress> hashMap = new ConcurrentHashMap<>();
        System.out.println("等待服务器连接。。。");
        while (true) {
            Socket accept = ss.accept();
            hashMap.put(accept, accept.getRemoteSocketAddress());//等待客户端连接
            service.submit(() -> {          //把所要执行的代码放到线程池中执行
                try {
                    byte[] bytes = new byte[1024];        //创建字节数组
                    InputStream inputStream = accept.getInputStream();//服务器读入客户端所传来的信息
                    SocketAddress address = accept.getRemoteSocketAddress();
                    while (true) {
                        int read = inputStream.read(bytes); //把读入的信息放到字节数组中
                        if (read == -1) {      //如果读到-1则结束读的过程
                            break;
                        }
                        String s = address + "" + new String(bytes, 0, read);  //把读入字节数组的信息转化成字符串并且打印出来
                        //System.out.println(s);
                        for (Socket sd : hashMap.keySet()) {
                            OutputStream outputStream = sd.getOutputStream();
                            outputStream.write(s.getBytes());
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            });
        }

    }
}

客户端：代码展示：

public class Demo {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 8888);   //创建客户端
        Scanner sc = new Scanner(System.in);    //创建输入流
        new Thread(() -> {
            InputStream inputStream = null;
            try {
                inputStream = socket.getInputStream();
            } catch (IOException e) {
                e.printStackTrace();
            }
            while (true) {
                byte[] bytes = new byte[1024];
                int read = 0;
                try {
                    read = inputStream.read(bytes);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (read == -1) {
                    break;
                }
                String string = new String(bytes, 0, read);
                System.out.println(string);

            }
        }).start();
        while (true) {
            String s = sc.nextLine();       //从控制台输入，并且发送给服务器端
            socket.getOutputStream().write(s.getBytes());
        }
    }
}