JSP 树形展示
<% ArrayList info=(ArrayList)request.getAttribute("info"); %>
<tr>
<td>主菜单</td>
<td>子菜单</td>
</tr><hr>
<% for(int i=0;i<info.size();i++){
Index s=(Index)info.get(i);
%>
<tr>
<td><%=s.getCdhzm()%></td>
<td><%=s.getCdhzm2()%></td>
</tr>
<hr>
<%} %>
结果为
主菜单 子菜单
a 1
a 2
b 3
b 4
b 5
如何展示为树形结构?