前端框架 关于树形菜单的递归方法

/**
   * 查询后台需要属性展示的菜单表数据 注意：该数据转换成json对象， 是不符合easyUI的tree主键展现的json格式
   * 
   * @param map
   * @param pageBean
   * @return
   * @throws Exception
   */
  public List<Map<String, Object>> menuList(Map<String, String[]> map, PageBean bean) throws Exception {
    String sql = "select * from t_easyui_menu where true";
    String menuid = JsonUtils.getParmeterVal(map, "Menuid");
    if (menuid != null && menuid != "") {
      sql += " and parentid=" + menuid;
    } else {
      sql += " and parentid=-1";
    }
    return super.executeQuery(sql, bean);
  }

  /**
   * 查出来的数据不能战术，转换为可展示的数据
   * 
   * @param map
   * @param treeNode
   * @throws Exception
   */
  private void mapToTreeNode(Map<String, Object> map, TreeNode treeNode) throws Exception {
    treeNode.setId(map.get("Menuid").toString());
    treeNode.setText(map.get("Menuname").toString());
    treeNode.setAttributes(map);
    Map<String, String[]> paramMap = new HashMap<>();
    // 把当前节点id当作父id，查出所有的子节点
    paramMap.put("Menuid", new String[] { treeNode.getId() });
    List<Map<String, Object>> menuList = this.menuList(paramMap, null);
    List<TreeNode> TreeNodelist = new ArrayList<>();
    //再次遍历
    mapListToTreeNodeList(menuList, TreeNodelist);
    treeNode.setChildren(TreeNodelist);
  }

  /**
   * 
   * @Title: mapListToTreeNodeList
   * @Description:遍历数据库中查询的数据
   * @param list
   * @param treeNodeslist
   * @throws Exception
   * @return void
   */
  private void mapListToTreeNodeList(List<Map<String, Object>> list, List<TreeNode> treeNodeslist) throws Exception {
    TreeNode treeNode = null;
    for (Map<String, Object> map : list) {
      treeNode = new TreeNode();
      mapToTreeNode(map, treeNode);
      treeNodeslist.add(treeNode);
    }
  }

  /**
   * 这个方法的返回值，才是符合easyui的tree组件需要的
   * 
   * @param map
   * @param pageBean
   * @return
   * @throws Exception
   */
  public List<TreeNode> menuTreeList(Map<String, String[]> map, PageBean pageBean) throws Exception {
    List<Map<String, Object>> menuList = this.menuList(map, pageBean);
    List<TreeNode> TreeNodelist = new ArrayList<>();
    mapListToTreeNodeList(menuList, TreeNodelist);
    return TreeNodelist;
  }