Swing实现将窗口最小化到系统托盘

package Assis;

import java.awt.AWTException;
import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.GroupLayout;
import javax.swing.JFrame;
import javax.swing.GroupLayout.ParallelGroup;
import javax.swing.GroupLayout.SequentialGroup;

public class ToTrayIcon extends JFrame implements ActionListener,
		WindowListener {

	private static final long serialVersionUID = 1L;
	// Variables declaration - do not modify
	private javax.swing.JLabel L_img;
	private javax.swing.JLabel L_img2;
	private PopupMenu pop;
	private MenuItem open, close;
	private TrayIcon trayicon;

	// End of variables declaration

	/** Creates new form MainFrame */
	public ToTrayIcon() {
		setTitle("Java实现系统托盘示例");
		setLocation(300, 300);
		initComponents();
		addWindowListener(this);
	}

	/**
	 * This method is called from within the constructor to initialize the form.
	 * WARNING: Do NOT modify this code. The content of this method is always
	 * regenerated by the Form Editor.
	 */
	// <editor-fold defaultstate="collapsed" desc="Generated Code">
	private void initComponents() {

		// L_img = new javax.swing.JLabel(new
		// ImageIcon((MainFrame.class).getResource("com/topking/tray/images/netbean1.png")));
		// L_img2 = new javax.swing.JLabel(new
		// ImageIcon((MainFrame.class).getResource("com/topking/tray/images/netbean2.png")));
		L_img = new javax.swing.JLabel();
		L_img2 = new javax.swing.JLabel();

		pop = new PopupMenu();
		open = new MenuItem("打开");
		open.addActionListener(this);

		close = new MenuItem("关闭");
		close.addActionListener(this);

		pop.add(open);
		pop.add(close);

		if (SystemTray.isSupported()) {
			SystemTray tray = SystemTray.getSystemTray();
			Image icon = getToolkit().getImage(
					getClass().getResource("/user.png"));
			trayicon = new TrayIcon(icon, "系统托盘示例(java)", pop);
			trayicon.addMouseListener(new MouseListener() {

				public void mouseClicked(MouseEvent e) {
					if (e.getClickCount() == 2) {
						if (getExtendedState() == JFrame.ICONIFIED) {
							openFrame();// 还原窗口
						} else {
							// 设置窗口状态(最小化至托盘)
							setExtendedState(JFrame.ICONIFIED);
						}
					}
				}

				public void mouseEntered(MouseEvent e) {

				}

				public void mouseExited(MouseEvent e) {

				}

				public void mousePressed(MouseEvent e) {

				}

				public void mouseReleased(MouseEvent e) {

				}

			});

			try {
				tray.add(trayicon);
			} catch (AWTException e) {
				e.printStackTrace();
			}
		}
		/** *设置界面布局,可以不用理睬它 */
		GroupLayout layout = new GroupLayout(getContentPane());
		getContentPane().setLayout(layout);
		ParallelGroup parg = layout
				.createParallelGroup(GroupLayout.Alignment.LEADING);
		SequentialGroup seqg = layout.createSequentialGroup();
		ParallelGroup parg2 = layout
				.createParallelGroup(GroupLayout.Alignment.TRAILING);

		ParallelGroup parg3 = parg2.addComponent(L_img2,
				GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 380,
				Short.MAX_VALUE);
		ParallelGroup parg4 = parg3.addComponent(L_img,
				GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 380,
				Short.MAX_VALUE);
		SequentialGroup seqg2 = seqg.addContainerGap();
		SequentialGroup seqg3 = seqg2.addGroup(parg4);
		SequentialGroup seqg4 = seqg3.addContainerGap();
		ParallelGroup parg5 = parg.addGroup(GroupLayout.Alignment.TRAILING,
				seqg4);
		layout.setHorizontalGroup(parg5);
		parg = layout.createParallelGroup(GroupLayout.Alignment.LEADING);
		layout.setVerticalGroup(parg.addGroup(layout.createSequentialGroup()
				.addContainerGap().addComponent(L_img).addGap(29, 29, 29)
				.addComponent(L_img2, GroupLayout.PREFERRED_SIZE, 222,
						GroupLayout.PREFERRED_SIZE).addContainerGap(39,
						Short.MAX_VALUE)));

		pack();
	}

	/**
	 * @param args
	 *            the command line arguments
	 */
	public static void main(String args[]) {
		java.awt.EventQueue.invokeLater(new Runnable() {
			public void run() {
				new ToTrayIcon().setVisible(true);
			}
		});
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == open) {
			openFrame();
		}
		if (e.getSource() == close) {
			System.exit(-1);
		}
	}

	public void openFrame() {
		setVisible(true);// 设置为可见
		setAlwaysOnTop(true);// 设置置顶
		// 设置窗口状态(在最小化状态弹出显示)
		setExtendedState(JFrame.NORMAL);
	}

	public void windowActivated(WindowEvent arg0) {

	}

	public void windowClosed(WindowEvent arg0) {
		dispose();
	}

	public void windowClosing(WindowEvent arg0) {

	}

	public void windowDeactivated(WindowEvent arg0) {

	}

	public void windowDeiconified(WindowEvent arg0) {

	}

	// 窗口最小化
	public void windowIconified(WindowEvent arg0) {
		setVisible(false);// 设置为不可见
	}

	public void windowOpened(WindowEvent arg0) {

	}

}