list转换为树结构--递归

public static   JSONArray treeMenuList(List<Map<String, Object>> menuList, Object parentId) {
	       JSONArray childMenu = new JSONArray();
	       for (Object object : menuList) {
	           JSONObject jsonMenu = JSONObject.fromObject(object);
	           Object menuId = jsonMenu.get("子");
	           Object pid = jsonMenu.get("父");
	           if (parentId.toString().equals(pid.toString())) {
	               JSONArray c_node = treeMenuList(menuList, menuId);
	               jsonMenu.put("child", c_node);
	               childMenu.add(jsonMenu);
	           }
	       }
	       return childMenu;
	   }

传入根节点，返回树形结构