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