import java.awt.AWTException; 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.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.WindowEvent; import java.awt.event.WindowStateListener; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.Timer; import javax.swing.UIManager; /**  *  * @author Mr.LiuTao  */ public class TrayByJdk extends JFrame implements ActionListener{     private JPanel pane = null;     private JButton button = null; // 启动托盘图标的按钮     private JLabel label = null; // 用来显示系统是否支持托盘的信息     private TrayIcon trayIcon = null; // 托盘图标     private Timer shanshuo = null;     private ImageIcon icon1 = null;     private ImageIcon icon2 = null;     private SystemTray tray = null; // 本操作系统托盘的实例     boolean gengai = false;     //采用jdk1.6的托盘技术 实现跨平台的应用     public TrayByJdk() {         //super("托盘技术演示");         icon1 = new ImageIcon("G:\\javaworks\\eclipsework\\山寨QQClient\\images\\16.gif"); // 将要显示到托盘中的图标         icon2 = new ImageIcon("G:\\javaworks\\eclipsework\\山寨QQClient\\images\\15.gif"); // 将要显示到托盘中的图标         try {             // 将LookAndFeel设置成Windows样式             UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");         } catch (Exception ex) {             ex.printStackTrace();         }         pane = new JPanel();         button = new JButton("缩小到托盘");         button.setEnabled(false);         label = new JLabel("本操作系统不支持托盘");         pane.add(label);         pane.add(button);         //判断是否支持托盘         if (SystemTray.isSupported()) {             this.tray();         }         shanshuo = new Timer(1000,this);         shanshuo.start();         this.getContentPane().add(pane);         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         this.setSize(300, 200);         this.addWindowStateListener(new WindowStateListener () {    public void windowStateChanged(WindowEvent state) {     if(state.getNewState() == 1 || state.getNewState() == 7) {      yinca();     }    }   });         this.setVisible(false);         System.out.println("=============="+this.isVisible());     }     /**      * 托盘相关代码      */     private void tray() {         label.setText("本操作系统支持托盘");         button.setEnabled(true);         tray = SystemTray.getSystemTray(); // 获得本操作系统托盘的实例         //ImageIcon icon = new ImageIcon("tray.gif"); // 将要显示到托盘中的图标         PopupMenu pop = new PopupMenu(); // 构造一个右键弹出式菜单         MenuItem show = new MenuItem("显示窗口");         MenuItem exit = new MenuItem("退出演示");         MenuItem author = new MenuItem("Author");               /**          * TrayIcon有三个构造          * TrayIcon(Image image) 用“图标”来构造          * TrayIcon(Image image, String tooltip) 用“图标”和“ToolTip”构造          * TrayIcon(Image image, String tooltip, PopupMenu popup) 用“图标”，“ToolTip”，“弹出菜单”来构造一个托盘图标          */         trayIcon = new TrayIcon(icon1.getImage(), "托盘技术演示", pop);         // 点击本按钮后窗口被关闭，托盘图标被添加到系统的托盘中         button.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 try {                     tray.add(trayIcon); // 将托盘图标添加到系统的托盘实例中                     setVisible(false); // 使窗口不可视                 } catch (AWTException ex) {                     ex.printStackTrace();                 }             }         });         /**          * 添加鼠标监听器，当鼠标在托盘图标上双击时，默认显示窗口          */         trayIcon.addMouseListener(new MouseAdapter() {             public void mouseClicked(MouseEvent e) {                 if (e.getClickCount() == 2) { // 鼠标双击                     tray.remove(trayIcon); // 从系统的托盘实例中移除托盘图标                     setVisible(true); // 显示窗口                 }             }         });         show.addActionListener(new ActionListener() { // 点击“显示窗口”菜单后将窗口显示出来             public void actionPerformed(ActionEvent e) {                 tray.remove(trayIcon); // 从系统的托盘实例中移除托盘图标                 setVisible(true); // 显示窗口             }         });         exit.addActionListener(new ActionListener() { // 点击“退出演示”菜单后推出程序             public void actionPerformed(ActionEvent e) {                 System.exit(0); // 退出程序             }         });         author.addActionListener(new ActionListener() { // 点击“退出演示”菜单后推出程序             public void actionPerformed(ActionEvent e) {                 showMessage();             }         });         pop.add(show);         pop.add(exit);         pop.add(author);     }     /**      * 显示信息      */     private void showMessage() {         JOptionPane.showMessageDialog(this, new JLabel("这是一个系统托盘"), "消息", JOptionPane.INFORMATION_MESSAGE);     }     public static void main(String[] args) {         new TrayByJdk().yinca();     }     public void yinca(){       try {    tray.add(trayIcon);   } catch (AWTException e) {    // TODO Auto-generated catch block    e.printStackTrace();   } // 将托盘图标添加到系统的托盘实例中          setVisible(false); // 使窗口不可视     }  @Override  public void actionPerformed(ActionEvent arg0) {   if(!gengai){    trayIcon.setImage(icon2.getImage());    gengai = true;   }else{    trayIcon.setImage(icon1.getImage());    gengai = false;   }  } }