后台写法

    /**
     * 动态获取菜单信息
     * @param request
     * @param response
     * @return Map
     */
    public Map getMenuInfo(HttpServletRequest request, HttpServletResponse response) {
        MenuInfoVO obj = new MenuInfoVO();
        obj.setMenuId("0");
        MenuInfoVO menuInfoVO = (MenuInfoVO)menuInfoDao.selectTreeForMenuId(obj);//根据menuId查询
        //使用Dom4j生成xml
        Document document = DocumentHelper.createDocument();
        document.setXMLEncoding("GB2312");
        Element root = document.addElement("tree");
        root.addAttribute("id", "-1");
        Document doc = createXMLMenuData(menuInfoVO, document, root);
        String content = doc.asXML();
        response.setContentType("text/xml; charset=GB2312");
        try {
            response.getWriter().write(content);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 递归生成xml
     * @param menuInfoVO ,document ,root
     * @param document
     * @param root
     * @return
     */
    public Document createXMLMenuData(MenuInfoVO menuInfoVO, Document document, Element root) {
        //判断是否是最后一个节点（代表电话号码字符串）
        if(menuInfoVO.getMenuLevel()== 3) {
            Element vaitem = root.addElement("item");
            vaitem.addAttribute("text",menuInfoVO.getMenuName());
            vaitem.addAttribute("id", menuInfoVO.getMenuId());
        } else {
            Element item = root.addElement("item");
            item.addAttribute("text",menuInfoVO.getMenuName());
            item.addAttribute("id", menuInfoVO.getMenuId());
            List list = menuInfoDao.selectTreeForMenuParentId(menuInfoVO);//根据menuParentId查询
            int num = list.size();
            //判断 是否有子菜单
            if(num > 0) {
                for(int i = 0; i < num; i++) {
                    MenuInfoVO vo = (MenuInfoVO)list.get(i);
                    if("0".equals(vo.getParentId())) {
                        tempList.add(vo.getMenuId());
                    }
                    //展开子节点
                    if(tempList != null) {
                        if(tempList.contains(vo.getParentId())) {
                            item.addAttribute("open","1");
                        }
                    }
                    createXMLMenuData(vo, document, item); //递归
                }

            }
        }

        return document;
    }