右键单击Java JTree的上下文菜单？

JPopupMenu popupMenu = new JPopupMenu();
JMenuItem menuItem1 = new JMenuItem("菜单项1");
JMenuItem menuItem2 = new JMenuItem("菜单项2");
popupMenu.add(menuItem1);
popupMenu.add(menuItem2);

jTree.addMouseListener(new MouseAdapter() {
    @Override
    public void mousePressed(MouseEvent e) {
        showPopup(e);
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        showPopup(e);
    }

    private void showPopup(MouseEvent e) {
        if (e.isPopupTrigger()) {
            TreePath path = jTree.getPathForLocation(e.getX(), e.getY());
            if (path != null) {
                jTree.setSelectionPath(path);
                popupMenu.show(e.getComponent(), e.getX(), e.getY());
            }
        }
    }
});