<td height='31'><a href='../admin/index.jsp'>首页</a></td> 改成如下即可识别
<td height='31'><a href='${pageContext.request.contextPath}/admin/index.jsp'>首页</a></td>
<td height='31'><a href='../admin/index.jsp'>首页</a></td> 改成如下即可识别
<td height='31'><a href='${pageContext.request.contextPath}/admin/index.jsp'>首页</a></td>