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对Web作用域变量进行迭代
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<html>
<head>
<title>主页</title>
</head>
<body>
<table border="1">
<caption>page作用域迭代</caption>
<tr>
<td>键</td>
<td>值</td>
</tr>
<c:forEach items="${pageScope}" var="oneAttr">
<tr>
<td>${oneAttr.key}</td>
<td>${oneAttr.value}</td>
</tr>
</c:forEach>
</table>
<hr/>
<table border="1">
<caption>request作用域迭代</caption>
<tr>
<td>键</td>
<td>值</td>
</tr>
<c:forEach items="${requestScope}" var="oneAttr">
<tr>
<td>${oneAttr.key}</td>
<td>${oneAttr.value}</td>
</tr>
</c:forEach>
</table>
<hr/>
<table border="1">
<caption>session作用域迭代</caption>
<tr>
<td>键</td>
<td>值</td>
</tr>
<c:forEach items="${sessionScope}" var="oneAttr">
<tr>
<td>${oneAttr.key}</td>
<td>${oneAttr.value}</td>
</tr>
</c:forEach>
</table>
<hr/>
<table border="1">
<caption>application作用域迭代</caption>
<tr>
<td>键</td>
<td>值</td>
</tr>
<c:forEach items="${applicationScope}" var="oneAttr">
<tr>
<td>${oneAttr.key}</td>
<td>${oneAttr.value}</td>
</tr>
</c:forEach>
</table>
<hr/>
</body>
</html>
