Question

我有一个jframe和jtextpane，我想运行一个方法，在pc中检查端口，直到用户关闭jframe，我尝试使用windowlistner，但该方法只运行一次，我希望它运行直到用户关闭应用程序

frame = new JFrame();

        frame.setResizable(false);
        frame.setBounds(100, 100, 552, 444);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        frame.addWindowListener(new WindowListener() {

            @Override
            public void windowOpened(WindowEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void windowIconified(WindowEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void windowDeiconified(WindowEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void windowDeactivated(WindowEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void windowClosing(WindowEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void windowClosed(WindowEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void windowActivated(WindowEvent arg0) {
                checkport(); // this run at first time only!

            }
        });

Answer 1

您应该使用Separate Thread检查显示Frame时启动的端口。在windowClosing Event上你停止线程。

示例代码：

    frame = new JFrame();
    frame.setResizable(false);
    frame.setBounds(100, 100, 552, 444);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);
    final CheckPort checkPort = new CheckPort();
    final Thread thread = new Thread( checkPort );
    thread.start();
    frame.addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosing( WindowEvent e ) {
            checkPort.stop();
            thread.interrupt();
        }
    });

用于检查端口的Runnable。

    public class CheckPort implements Runnable {
        private boolean checkPort = true;

        public void run() {
            while( checkPort ) {
                checkPort();
                try {
                    Thread.sleep( 100 );
                } catch( InterruptedException ex ) {
                }
            }
        }

        public void checkPort() {
            // do check port here
        }

        public void stop() {
            checkPort = false;
        }
    }

Jframe中的后台操作

1 个答案: