如何在JDialog上注册全局ESC键事件

大多数用户可能会有这么一个习惯：对于富客户端弹出的Dialog，习惯使用ESC将其关闭，而不是“叉掉它”。在Swing中，弹出窗口一般继承自JDialog类，但默认没有对ESC键事件做响应，下面这段代码可以完成这个功能：

private static final KeyStroke escapeStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0);
public static final String dispatchWindowClosingActionMapKey = "com.jayxu:WINDOW_CLOSING"; // any key string you like

public static void installEscapeCloseOperation(final JDialog dialog) { // any method name you like
    Action dispatchClosing = new AbstractAction() {
        public void actionPerformed(ActionEvent event) {
            dialog.dispatchEvent(new WindowEvent(dialog, WindowEvent.WINDOW_CLOSING));
        }
    };

    JRootPane root = dialog.getRootPane();
    root.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(escapeStroke, dispatchWindowClosingActionMapKey);
    root.getActionMap().put( dispatchWindowClosingActionMapKey, dispatchClosing);
}