在 java 中使用多线程和 tcp 套接字如何知道有多少用户在线

Question

I'm makeing a game online using java socket and I don't know how to FrmServer can set label for number of users are logged in. In each EchoThread will handle for a client and has a public static ArrayList<EchoThread> clients = new ArrayList<>(); 解决游戏房间划分问题。

public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        FrmServer frmServer = new FrmServer(); // this frame server need to know how many clients are logged in
        try {
            serverSocket = new ServerSocket(PORT);
        } catch (IOException e) {
            e.printStackTrace();

        }
        while (true) {
            try {
                socket = serverSocket.accept();
            } catch (IOException e) {
                System.out.println("I/O error: " + e);
            }
            // new thread for a client
            EchoThread echoThread = new EchoThread(socket);
            echoThread.start();
        }
    }

如何触发表单服务器知道用户已成功登录并增加 label 值或在用户断开连接时减少它？

注意：我处理了登录和断开连接，并且都在 EchoThread 中解决了

Answer 1

我做到了，我只需frmServer object 传递给 EchoThread 并从 Echothread 中调用 setLabel function 。

EchoThread echoThread = new EchoThread(socket, frmServer);