(java后台)用户权限的多级菜单遍历方法

很多用户登录后根据用户的标识查询该用户角色所对应的菜单

	@Override
	public UserRespVo login(UserVo user) {
		if(null != user){//如果传入的用户不为空
			String userId = user.getUserid();
			String password = user.getPassword();
			//根据用户id查询用户
			UserPo userPo = userPoMapper.selectByPrimaryKey(userId);
			if(null != userPo){
				//如果存在该用户，对比密码看是否匹配
				String resultpassword = userPo.getPassword();
				if(resultpassword.equals(password)){
					//如果密码匹配，查询用户的菜单
					List resultUserPoMenuList = userPoMapper.selectUserMenu(userPo.getUserid());
					List resultUserVoMenuList = new ArrayList();
					//将查询的结果po转为vo
					for (MenuPo menuPo : resultUserPoMenuList) {
						MenuVo menuVo = new MenuVo();
						BeanUtils.copyProperties(menuPo, menuVo);
						resultUserVoMenuList.add(menuVo);
					}
					//根据一级菜单id查询所有的菜单
					List userMenuVos = new ArrayList();
					for (MenuVo menuVo : resultUserVoMenuList) {
						//这里需要的是一级菜单的id，对于没有父菜单id的就是一级菜单
						if(StringUtils.isBlank(menuVo.getMenuparent())){
							List iterateMenus = iterateMenus(resultUserVoMenuList, menuVo.getMenuid());
							menuVo.setMenuVo(iterateMenus);
							userMenuVos.add(menuVo);
						}
					}
					UserRespVo userRespVo = new UserRespVo();
					userRespVo.setErrMsg("登录成功");
					userRespVo.setStatusCode("1");
					userRespVo.setMenus(userMenuVos);
					userRespVo.setUserId(userPo.getUserid());
					userRespVo.setUserName(userPo.getUsername());
					logger.info(userPo.getUserid()+"：登录成功");
					return userRespVo;
				}else{
					//如果密码不匹配
					UserRespVo userRespVo = new UserRespVo();
					userRespVo.setErrMsg("密码错误");
					userRespVo.setStatusCode("0");
					logger.info(userPo.getUserid()+"：密码错误，登录失败");
					return userRespVo;
				}
			}else{
				UserRespVo userRespVo = new UserRespVo();
				userRespVo.setErrMsg("不存在该用户");
				userRespVo.setStatusCode("0");
				logger.info("不存在该用户，登录失败");
				return userRespVo;
			}
		}
		UserRespVo userRespVo = new UserRespVo();
		userRespVo.setErrMsg("用户名和密码不能为空");
		userRespVo.setStatusCode("0");
		logger.info("用户名和密码不能为空");
		return userRespVo;
	}

//多级菜单查询方法
	public List iterateMenus(List menuVoList,String pid){
		List result = new ArrayList();
		for (MenuVo menuVo : menuVoList) {
			String menuid = menuVo.getMenuid();//获取菜单的id
			String parentid = menuVo.getMenuparent();//获取菜单的父id
			if(StringUtils.isNotBlank(parentid)){
				if(parentid.equals(pid)){
					List iterateMenu = iterateMenus(menuVoList,menuid);
					menuVo.setMenuVo(iterateMenu);
					result.add(menuVo);
				}
			}
		}
		return result;
	}