jstl EL表达式遍历Map的方法

<% 
Map<String,String> map2 = new HashMap(); 
map2.put("a","hello world"); 
map2.put("b","this is map"); 
request.setAttribute("map2",map2); 
%>
<c:forEach var="item" items="${map2}"> 
${item.key} > ${item.value} <br> 
</c:forEach> 
<c:if test="${item.product!=null || fn:length(item.product) != 0}">
 <c:forEach items="${item.product}" var="product">
  <c:if test="${product.key=='userName'}">
   ${product.value}
  </c:if>
 </c:forEach>
</c:if>