SSM+layUI 根据登录信息显示不同的页面方法

<ul class="layui-nav" lay-filter="">
  <li class="layui-nav-item layui-this"><a href="/why123/user/saveUser" rel="external nofollow" style="font-size:20px;">首页</a></li>
  <li class="layui-nav-item "><a href="/why123/news/forwardNews" rel="external nofollow" style="font-size:20px;">新闻</a></li>
  <li class="layui-nav-item "><a href="#" rel="external nofollow" rel="external nofollow" style="font-size:20px;">家庭活动</a></li>
  <li class="layui-nav-item ">
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" style="font-size:20px;">家庭相册</a>
  <dl class="layui-nav-child"> <!-- 二级菜单 -->
   <dd><a href="" style=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" font-size:15px;">个人相册</a></dd>
   <dd><a href="" style=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" font-size:15px;">他人相册</a></dd>
   <dd><a href="" style=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" font-size:15px;">热门相册</a></dd>
  </dl>
 </li> 
 <li class="layui-nav-item"><a href="#" rel="external nofollow" rel="external nofollow" style="font-size:20px;">意见反馈</a></li>
 <li class="nav-user">
 <% String userName=(String)session.getAttribute("userName");
 if(userName==null){ %>
 <div>
 <a href="/why123/login/userLogin" rel="external nofollow" class="nav-denglu">登录</a>
 </div>
 <%}else{%>
 <div class="user-msg">
  <ul class="layui-nav nav-userlogin">
  <li class="layui-nav-item">
  <a href="" style=" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" font-size:18px;"><img src="plug-in/images/people/renwu.jpg" class="layui-nav-img" style="width:40px;height:40px;">${sessionScope.userName}</a>
  <dl class="layui-nav-child">
   <dd><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" style="font-size:18px;">修改信息</a></dd>
   <dd><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" style="font-size:18px;">个人管理</a></dd>
   <dd><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" style="font-size:18px;">注销</a></dd>
  </dl>
  </li>
   </ul>
 </div>
 <%} %>
 </li>
 </ul>