使用了EL表达式的隐式对象实例。
el_object.jsp文件源码：
<%@ page language=”java” import=”java.util.*” pageEncoding=”gb2312″%>
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>
<title>My JSP ‘el_object.jsp’ starting page</title>
</head>
<body>
<form action=”el_object.jsp” method=”get”>
context=<input type=”text” name=”context” value=”${param['context'] }”>
<br>
<input type=”submit”>
</form>
<br><p>
<code>
<table border=”1″>
<thead>
<td><b>使用了EL表达式的隐式对象</b></td>
</thead>
<tr>
<td>\${param.context }</td>
<td>${param.context }</td>
</tr>
<tr>
<td>\${param["context "]}</td>
<td>${param["context "] }</td>
</tr>
<tr>
<td>\${header["host"]}</td>
<td>${header["host"]}</td>
</tr>
<tr>
<td>\${header["accept"]}</td>
<td>${header["accept"]}</td>
</tr>
<tr>
<td>\${header["user-agent"]}</td>
<td>${header["user-agent"]}</td>
</tr>
</table>
</code>
</body>
</html>