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@Test

    public void testTray(){

        Display display=new Display();

        Shell topShell=new Shell(display);

        Tray tray=display.getSystemTray();

        if (tray==null) {

            System.out.println("不支持");

            return;

        }

        //设置系统托盘的工作项，显示在右下角的东西

        TrayItem trayItem=new TrayItem(tray, SWT.NONE);

        //可以带“/”,表示从类的根路径，否则从相应的.class文件开始

//      MenuDemo.class.getResourceAsStream("");

        //总是从类的根路径

//      MenuDemo.class.getClassLoader().getResourceAsStream("");

//      trayItem.setImage(display.getSystemImage(id))

        //设置工作项的图标，否则不显示

        trayItem.setImage(new Image(display, this.getClass().getResourceAsStream("tray.gif")));

        final Menu menu=new Menu(topShell,SWT.POP_UP);

        MenuItem a=new MenuItem(menu, SWT.PUSH);

        a.setText("在线更新");

        MenuItem b=new MenuItem(menu, SWT.PUSH);

        b.setText("关于我们");

        menu.setDefaultItem(a);//颜色更黑

        Listener listener=new Listener() {

            @Override

            public void handleEvent(Event event) {

                if (event.type==SWT.DefaultSelection) {

                    System.out.println("双击");

                    menu.setVisible(true);

                }else if (event.type==SWT.MenuDetect) {

                    System.out.println("MenuDetect");

                    menu.setVisible(true);

                }else if (event.type==SWT.Show) {

                    System.out.println("显示托盘项");

                }else if (event.type==SWT.Selection) {//单击

                    System.out.println("单击托盘项");

                }else if (event.type==SWT.Hide) {

                    System.out.println("隐藏托盘项");

                }

            }

        };

        //给工作项设置监听

        trayItem.addListener(SWT.DefaultSelection, listener);//双击托盘项

        trayItem.addListener(SWT.MenuDetect, listener);//右击托盘项

        trayItem.addListener(SWT.Show, listener);

        trayItem.addListener(SWT.Selection, listener);

        trayItem.addListener(SWT.Hide, listener);

        topShell.pack();

        topShell.open();

        while(!topShell.isDisposed()){

            if (!display.readAndDispatch()) {

                display.sleep();

            }

        }

        display.dispose();

    }