private void systemTray() {
        if (SystemTray.isSupported()) { // 判断系统是否支持托盘功能.
            // 创建托盘右击弹出菜单
            PopupMenu popupMenu = new PopupMenu();
 
            //创建弹出菜单中的退出项
            MenuItem itemExit = new MenuItem("Exit");
            itemExit.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    System.exit(0);
                }
            });
            popupMenu.add(itemExit);
 
 
            //创建托盘图标
            ImageIcon icon = new ImageIcon(getClass().getResource("image/timg.jpg")); 
// 创建图片对象
            TrayIcon trayIcon = new TrayIcon(icon.getImage(), "Scan Upload",
                    popupMenu);
//这句话很重要，不然托盘图标不显示！！！
            trayIcon.setImageAutoSize(true);
            trayIcon.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    TwainADF_VerificationForm.this.setVisible(true);
                }
            });
 
            //把托盘图标添加到系统托盘
            //这个可以点击关闭之后再放到托盘里面，在此是打开程序直接显示托盘图标了
            try {
                SystemTray.getSystemTray().add(trayIcon);
            } catch (AWTException e1) {
                e1.printStackTrace();
            }
        }
    }

this.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);