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<%@ page language="java" import="java.util.*,com.fly.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<%
int userId = new Random().nextInt(100);
session.setAttribute("userId", userId);
session.setAttribute(userId + "_cartList", Arrays.asList(1, 2, 3));
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP</title>
</head>
<body>
<br> ${userId}
<br>
<c:set var="key" value="${userId}_cartList" />
<c:forEach var="it" items="${sessionScope[key]}">
${it}
</c:forEach>
</body>
</html>