(客户端-服务器)当服务器的serversocket接受客户端不工作时的Java控件[closed]

我目前正在学习套接字,我的作业是创建一个聊天室,让多个客户可以自由交谈。老师给出的提示是,聊天室服务器仅在客户端尝试发送消息时接受客户端。这个作业应该在不使用线程的情况下完成。

根据给出的提示,我尝试在客户端和服务器代码中创建未绑定的ServerSocket和Socket。关键思想是,当客户端尝试向服务器发送消息时,客户端代码将连接未绑定的套接字,然后将触发服务器连接未绑定服务器套接字并接受客户端。

然而,当我运行代码时,服务器和客户端代码都在运行,它们声称所有连接都已建立,但我根本无法在客户端和服务器之间传输消息。

我尝试过在网上寻找答案,但找不到答案。我想问一下,我决定服务器何时接受客户端的方式是否正确。

我的聊天室服务器:

public class ChatRoom {
    public static void main(String[] args) throws Exception {

        int portNum = 4321;

        ServerSocket serverSocket = new ServerSocket();

        int count = 1;

        while (true) {

            // redeclare everything each round
            Socket socket = null;
            PrintWriter out = null;
            BufferedReader in = null;
            BufferedReader stdIn = null;
            String inputLine = null;

            // accept each time round
            serverSocket.bind(new InetSocketAddress(portNum));
            socket = serverSocket.accept();
            System.out.println("newly accepted!");

            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            stdIn = new BufferedReader(new InputStreamReader(System.in));

            if (!((inputLine = in.readLine()).equals("Bye"))) {
                System.out.println("Client says: " + inputLine);
                out.println(stdIn.readLine());
                out.flush();

                System.out.println("Message Count: " + count);
                count++;
            }
            else {
                out.println(inputLine);
                serverSocket.close();
                socket.close();
                out.close();
                in.close();
            }
        }
    }   
}

我的聊天室客户:

public class ChatRoomClient {
    public static void main(String[] args) throws Exception {
        String hostName = "localhost";
        int portNumber = 4321;

        Socket echoSocket = new Socket();   // creates an unbound socket

        PrintWriter out = null;
        BufferedReader in = null;
        BufferedReader stdIn = null;

        String userInput;
        do {
            out = null;
            in = null;
            stdIn = null;

            // each time round the unbound socket attempts to connect to send a message
            echoSocket.connect(new InetSocketAddress(hostName, portNumber));
            System.out.println("successfully connected");
            out = new PrintWriter(echoSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
            stdIn = new BufferedReader(new InputStreamReader(System.in));

            userInput = stdIn.readLine();
            out.flush();
            System.out.println("Server says: " + in.readLine());
        }
        while (!userInput.equals("Bye"));

        // close everything
        echoSocket.close();
        in.close();
        stdIn.close();
    }
}

谢谢