jsp 显示不了刚查询出来的结果

<%@ page language="java" contentType="text/html; charset=UTF-8" isELIgnored="false"%>

<%-- <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>     --%>

<jsp:directive.page import="com.smoothlybelt.dao.ProductDao"/>

<jsp:directive.page import="com.smoothlybelt.been.Product"/>

<jsp:directive.page import="java.util.List"/>

<jsp:directive.page import="java.util.Iterator"/>

    

<% 

	List<Product> productList = ProductDao.listProducts();

    Iterator<Product> it = productList.iterator();

	while(it.hasNext()){

		Product p = it.next();

		System.out.println(p.getProductId());

		System.out.println(p.getStoreId());

		System.out.println(p.getSalesTotalVolume());

		System.out.println(p.getProductEvalute());

	}



	request.setCharacterEncoding("utf-8"); 

	response.setContentType("text/html;charset=utf-8");

	request.setAttribute("productList", productList);

	

%>



<html text-algin="center">



<form action="" method = get>

	<table bgcolor = #cccccc cellspacing=1 cellpadding=5 width=100%  >

		<tr bgcolor=#dddddd>

			

			<th>产品ID</th>

			<th>商店ID</th>

			<th>产品价格</th>

			<th>产品状态</th>

			<th>发布时间</th>

			<th>产品总销量</th>

			<th>最小免费金额</th>

		</tr> 

		<c:forEach items="${productList} " var="product">

			<tr bgcolor=#dddddd height=50>

			<td>${product.productId}</td>

			<td>${product.storeId}</td>

			<td>${product.productPrise}</td>

			<td>${product.productState}</td>

			<td>${product.publishTime}</td>

			<td>${product.salesTotalVolume}</td>

			<td>${product.minFreeCost}</td>

			</tr>

		</c:forEach>

	</table>

</form>



</html>

本人刚学java web，按书上写了个例子。
productList中可以明确是有结果的，while循环里面的结果也是可以打出来的，但是为什么最终页面表格里面显示不出数据？