📄 implicit.jsp
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<%@ page contentType="text/html;charset=GBk" %>
<html>
<head>
<title>EL 隐含对象</title>
<style>
body, td {font-family:verdana;font-size:10pt;}
</style>
</head>
<body>
<%
//设置名字相同范围不同的属性
request.setAttribute("name","请求有效重名属性：request变量");
session.setAttribute("name","会话有效重名属性：session变量");
application.setAttribute("name","应用有效重名属性：application变量");
%>
<h2>EL 隐含对象</h2>
<table border="1">
<tr>
<td>说明</td>
<td>代码</td>
<td>输出</td>
</tr>
<tr>
<td>header</td>
<td>${'${'}header["User-Agent"]}</td>
<td>${header["User-Agent"]}</td>
</tr>
<tr>
<td>cookie</td>
<td>${'${'}cookie.JSESSIONID.value}</td>
<td>${cookie.JSESSIONID.value}</td>
</tr>
<tr>
<td>PageContext</td>
<td>${'${'}pageContext.request.requestURI}</td>
<td>${pageContext.request.requestURI}</td>
</tr>
<tr>
<td>PageContext</td>
<td>${'${'}pageContext.servletContext.serverInfo}</td>
<td>${pageContext.servletContext.serverInfo}</td>
</tr>
<tr>
<td>requestScope</td>
<td>${'${'}requestScope.name}</td>
<td>${requestScope.name}</td>
</tr>
<tr>
<td>sessionScope</td>
<td>${'${'}sessionScope.name}</td>
<td>${sessionScope.name}</td>
</tr>
<tr>
<td>applicationScope</td>
<td>${'${'}applicationScope.name}</td>
<td>${applicationScope.name}</td>
</tr>
<tr>
<td>param</td>
<td>${'${'}param["name"]}</td>
<td>${param["name"]}</td>
</tr>
<tr>
<td>paramValues</td>
<td>${'${'}paramValues.multi[1]}</td>
<td>${paramValues.multi[1]}</td>
</tr>
</table>
</body>
</html>
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