javax.swing.JDialog#addComponentListener ( )源码实例Demo

@Override
public String readLine(String promptMessage) {
    final JTextField juf = new JTextField();
    JOptionPane juop = new JOptionPane(juf,
            JOptionPane.QUESTION_MESSAGE,
            JOptionPane.OK_CANCEL_OPTION);
    JDialog userDialog = juop.createDialog(promptMessage);
    userDialog.addComponentListener(new ComponentAdapter() {
        @Override
        public void componentShown(ComponentEvent e) {
            SwingUtilities.invokeLater(new Runnable() {
                @Override
                public void run() {
                    juf.requestFocusInWindow();
                }
            });
        }
    });
    userDialog.setVisible(true);
    int uresult = (Integer) juop.getValue();
    userDialog.dispose();
    String userName = null;
    if (uresult == JOptionPane.OK_OPTION) {
        userName = new String(juf.getText());
    }

    if (StringUtils.isEmpty(userName)) {
        return null;
    } else {
        return userName;
    }
}
 

@Override
public String readPassword(String promptMessage) {
    final JPasswordField jpf = new JPasswordField();
    JOptionPane jop = new JOptionPane(jpf,
            JOptionPane.QUESTION_MESSAGE,
            JOptionPane.OK_CANCEL_OPTION);
    JDialog dialog = jop.createDialog(promptMessage);
    dialog.addComponentListener(new ComponentAdapter() {
        @Override
        public void componentShown(ComponentEvent e) {
            SwingUtilities.invokeLater(new Runnable() {
                @Override
                public void run() {
                    jpf.requestFocusInWindow();
                }
            });
        }
    });
    dialog.setVisible(true);
    int result = (Integer) jop.getValue();
    dialog.dispose();
    String password = null;
    if (result == JOptionPane.OK_OPTION) {
        password = new String(jpf.getPassword());
    }
    if (StringUtils.isEmpty(password)) {
        return null;
    } else {
        return password;
    }
}
 

@Override
public String inputPassword(String messageText) {
	final JPasswordField passwordField = new JPasswordField();
	JOptionPane jop = new JOptionPane(new Object[] { messageText, passwordField }, JOptionPane.QUESTION_MESSAGE,
			JOptionPane.OK_CANCEL_OPTION);
	JDialog dialog = jop.createDialog("Authentication required");
	dialog.addComponentListener(new ComponentAdapter() {

		@Override
		public void componentShown(ComponentEvent e) {
			SwingUtilities.invokeLater(new Runnable() {

				@Override
				public void run() {
					passwordField.requestFocusInWindow();
					passwordField.requestFocus();
				}
			});
		}
	});
	dialog.setVisible(true);
	int result = (Integer) jop.getValue();
	if (result == JOptionPane.OK_OPTION) {
		return new String(passwordField.getPassword());
	} else {
		return null;
	}
}
 

/**
 * Ask using a GUI for the username and password.
 */
private void readFromGUI() {
   // Create fields for user name.
   final JTextField usernameField = new JTextField(20);
   usernameField.setText(this.username);
   final JLabel usernameLabel = new JLabel("Username: ");
   usernameLabel.setLabelFor(usernameField);
   final JPanel usernamePane = new JPanel(new FlowLayout(FlowLayout.TRAILING));
   usernamePane.add(usernameLabel);
   usernamePane.add(usernameField);

   // Create fields for password.
   final JPasswordField passwordField = new JPasswordField(20);
   passwordField.setText(this.password);
   final JLabel passwordLabel = new JLabel("Password: ");
   passwordLabel.setLabelFor(passwordField);
   final JPanel passwordPane = new JPanel(new FlowLayout(FlowLayout.TRAILING));
   passwordPane.add(passwordLabel);
   passwordPane.add(passwordField);

   // Create panel
   final JPanel main = new JPanel();
   main.setLayout(new BoxLayout(main, BoxLayout.PAGE_AXIS));
   main.add(usernamePane);
   main.add(passwordPane);

   // Create and handle dialog
   final JOptionPane jop = new JOptionPane(main, JOptionPane.QUESTION_MESSAGE, JOptionPane.OK_CANCEL_OPTION);
   final JDialog dialog = jop.createDialog("User name and password");
   dialog.addComponentListener(new ComponentAdapter() {
      
      public void componentShown(ComponentEvent e) {
         SwingUtilities.invokeLater(new Runnable() {
            
            public void run() {
               if (usernameField.getText().isEmpty())
               {
                  usernameField.requestFocusInWindow();
               }
               else
               {
                  passwordField.requestFocusInWindow();
               }
            }
         });
      }
   });
   dialog.setVisible(true);
   final Integer result = (Integer) jop.getValue();
   dialog.dispose();
   if (result.intValue() == JOptionPane.OK_OPTION) {
      this.username = usernameField.getText();

      final char[] pwd = passwordField.getPassword();
      this.password = new String(pwd);
   }
}
 

/**
 * Shows a modal font-chooser dialog and blocks until the
 * dialog is hidden.  If the user presses the "OK" button, then
 * this method hides/disposes the dialog and returns the selected color.
 * If the user presses the "Cancel" button or closes the dialog without
 * pressing "OK", then this method hides/disposes the dialog and returns
 * <code>null</code>.
 *
 * @param component    the parent <code>Component</code> for the dialog
 * @param title        the String containing the dialog's title
 * @return the selected font or <code>null</code> if the user opted out
 * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 * returns true.
 * @see java.awt.GraphicsEnvironment#isHeadless
 */
public Font showDialog(Component component, String title) {

    FontTracker ok = new FontTracker(this);
    JDialog dialog = createDialog(component, title, true, ok, null);
    dialog.addWindowListener(new FontChooserDialog.Closer());
    dialog.addComponentListener(new FontChooserDialog.DisposeOnClose());

    dialog.setVisible(true); // blocks until user brings dialog down...

    return ok.getFont();
}