struts2 generator问题

<s:generator val="%{'aaa,bbb,ccc,ddd,eee'}" count="4" separator="," var="myAtt">
<s:iterator>
<s:property/>
</s:iterator>
<s:debug></s:debug>
</s:generator>
<%
Iterator i = (Iterator) pageContext.getAttribute("myAtt");
while(i.hasNext()) {
     String s = (String) i.next(); %>
     <%=s%> <br/>
<%    }
%>
<s:property>可以拿出数据，Iterator却拿不出来，请大侠赐教，蒙了