调用方法应用程序关闭时 [英] Call a method when application closes

问题描述

在我的挥杆聊天应用程序，我有一个用于注销用户注销按钮，它工作正常。现在我需要当我关闭Swing应用程序窗口注销用户。

In my Swing chat application I have a logout button which is used to logout the user and it works fine. Now I need to logout the user when I close the Swing application window.

我在Web应用程序中关闭使用JavaScript的浏览器的时候这样做，但现在我需要做的这Swing应用程序。

I did this in web application when closing browser using JavaScript, but now I need to do this in Swing application.

我怎样才能做到这一点？

How can I achieve this?

推荐答案

• 呼叫 JFrame.setDefaultCloseOperation（JFrame.DO_NOTHING_ON_CLOSE）


• 添加 的WindowListener 到框架上。


• 覆盖听者的适当的方法叫你收方法，然后设置帧无形处置。

例如

import java.awt.*;
import java.awt.event.*;
import java.net.URI;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

class CheckExit {

    public static void doSomething() {
        try {
            // do something irritating..
            URI uri = new URI(
                    "http://stackoverflow.com/users/418556/andrew-thompson");
            Desktop.getDesktop().browse(uri);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                // the GUI as seen by the user (without frame)
                JPanel gui = new JPanel(new BorderLayout());
                gui.setPreferredSize(new Dimension(400, 100));
                gui.setBackground(Color.WHITE);

                final JFrame f = new JFrame("Demo");
                f.setLocationByPlatform(true);
                f.add(gui);

                // Tell the frame to 'do nothing'.
                f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

                WindowListener listener = new WindowAdapter() {

                    @Override
                    public void windowClosing(WindowEvent we) {
                        int result = JOptionPane.showConfirmDialog(
                                f, "Close the application");
                        if (result==JOptionPane.OK_OPTION) {
                            doSomething();
                            f.setVisible(false);
                            f.dispose();
                        }
                    }
                };
                f.addWindowListener(listener);

                // ensures the frame is the minimum size it needs to be
                // in order display the components within it
                f.pack();
                // should be done last, to avoid flickering, moving,
                // resizing artifacts.
                f.setVisible(true);
            }
        };
        // Swing GUIs should be created and updated on the EDT
        // http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
        SwingUtilities.invokeLater(r);
    }
}

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