这可以确定没有任务栏的屏幕大小（以像素为单位）
//size of the screenDimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();//height of the task barInsets scnMax = Toolkit.getDefaultToolkit().getScreenInsets(getGraphicsConfiguration());int taskBarSize = scnMax.bottom;//available size of the screen setLocation(screenSize.width - getWidth(), screenSize.height - taskBarSize - getHeight());
编辑
有人可以在Xx_nix和Mac OSX上运行此代码，并检查JDialog是否确实位于右下角吗？
import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.UIManager.LookAndFeelInfo;public class NotificationPopup { private static final long serialVersionUID = 1L; private LinearGradientPaint lpg; private JDialog dialog = new JDialog(); private BackgroundPanel panel = new BackgroundPanel(); public NotificationPopup() { Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Insets scnMax = Toolkit.getDefaultToolkit(). getScreenInsets(dialog.getGraphicsConfiguration()); int taskBarSize = scnMax.bottom; panel.setLayout(new GridBagLayout()); GridBagConstraints constraints = new GridBagConstraints(); constraints.gridx = 0; constraints.gridy = 0; constraints.weightx = 1.0f; constraints.weighty = 1.0f; constraints.insets = new Insets(5, 5, 5, 5); constraints.fill = GridBagConstraints.BOTH; JLabel l = new JLabel("You have got 2 new Messages."); panel.add(l, constraints); constraints.gridx++; constraints.weightx = 0f; constraints.weighty = 0f; constraints.fill = GridBagConstraints.NONE; constraints.anchor = GridBagConstraints.NORTH; JButton b = new JButton(new AbstractAction("x") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(final ActionEvent e) { dialog.dispose(); } }); b.setOpaque(false); b.setMargin(new Insets(1, 4, 1, 4)); b.setFocusable(false); panel.add(b, constraints); dialog.setUndecorated(true); dialog.setSize(300, 100); dialog.setLocation(screenSize.width - dialog.getWidth(), screenSize.height - taskBarSize - dialog.getHeight()); lpg = new LinearGradientPaint(0, 0, 0, dialog.getHeight() / 2, new float[]{0f, 0.3f, 1f}, new Color[]{new Color(0.8f, 0.8f, 1f), new Color(0.7f, 0.7f, 1f), new Color(0.6f, 0.6f, 1f)}); dialog.setContentPane(panel); dialog.setVisible(true); } private class BackgroundPanel extends JPanel { private static final long serialVersionUID = 1L; BackgroundPanel() { setOpaque(true); } @Override protected void paintComponent(final Graphics g) { final Graphics2D g2d = (Graphics2D) g; g2d.setPaint(lpg); g2d.fillRect(1, 1, getWidth() - 2, getHeight() - 2); g2d.setColor(Color.BLACK); g2d.drawRect(0, 0, getWidth() - 1, getHeight() - 1); } } public static void main(final String[] args) { try { for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { System.out.println(info.getName()); if ("Nimbus".equals(info.getName())) { UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (UnsupportedLookAndFeelException e) { } catch (ClassNotFoundException e) { } catch (InstantiationException e) { } catch (IllegalAccessException e) { } SwingUtilities.invokeLater(new Runnable() { @Override public void run() { NotificationPopup notificationPopup = new NotificationPopup(); } }); }}
