Closing A JOptionPane Programmatically

问题

I am working on a project in which I would like to close a generic JOptionPane programmatically (by not physically clicking on any buttons). When a timer expires, I would like to close any possible JOptionPane that may be open and kick the user back to the login screen of my program. I can kick the user back just fine, but the JOptionPane remains unless I physically click a button on it.

I have looked on many sites with no such luck. A doClick() method call on the "Red X" of the JOptionPane does not seem possible, and using JOptionpane.getRootFrame().dispose() does not work.

回答1:

Technically, you can loop through all windows of the application, check is they are of type JDialog and have a child of type JOptionPane, and dispose the dialog if so:

Action showOptionPane = new AbstractAction("show me pane!") {

    @Override
    public void actionPerformed(ActionEvent e) {
        createCloseTimer(3).start();
        JOptionPane.showMessageDialog((Component) e.getSource(), "nothing to do!");
    }

    private Timer createCloseTimer(int seconds) {
        ActionListener close = new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                Window[] windows = Window.getWindows();
                for (Window window : windows) {
                    if (window instanceof JDialog) {
                        JDialog dialog = (JDialog) window;
                        if (dialog.getContentPane().getComponentCount() == 1
                            && dialog.getContentPane().getComponent(0) instanceof JOptionPane){
                            dialog.dispose();
                        }
                    }
                }

            }

        };
        Timer t = new Timer(seconds * 1000, close);
        t.setRepeats(false);
        return t;
    }
};

回答2:

This code gotten from https://amp.reddit.com/r/javahelp/comments/36dv3t/how_to_close_this_joptionpane_using_code/ seems to be the best approach to me. It involves Instantiating the JOptionPane class rather that using the static helper methods to do it for you. The benefit is you have a JOptionPane object that you can dispose when you want to close the dialog.

JOptionPane jop = new JOptionPane();
jop.setMessageType(JOptionPane.PLAIN_MESSAGE);
jop.setMessage("Hello World");
JDialog dialog = jop.createDialog(null, "Message");

// Set a 2 second timer
new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            Thread.sleep(2000);
        } catch (Exception e) {
        }
        dialog.dispose();
    }

}).start();

dialog.setVisible(true);

来源：https://stackoverflow.com/questions/18105598/closing-a-joptionpane-programmatically

标签

java

swing

joptionpane