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Tomcat example source code file (implicit-objects.jsp)
This example Tomcat source code file (implicit-objects.jsp) is included in the DevDaily.com
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The Tomcat implicit-objects.jsp source code
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<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<html>
<head>
<title>JSP 2.0 Expression Language - Implicit Objects
</head>
<body>
<h1>JSP 2.0 Expression Language - Implicit Objects
<hr>
This example illustrates some of the implicit objects available
in the Expression Lanaguage. The following implicit objects are
available (not all illustrated here):
<ul>
<li>pageContext - the PageContext object
<li>pageScope - a Map that maps page-scoped attribute names to
their values</li>
<li>requestScope - a Map that maps request-scoped attribute names
to their values</li>
<li>sessionScope - a Map that maps session-scoped attribute names
to their values</li>
<li>applicationScope - a Map that maps application-scoped attribute
names to their values</li>
<li>param - a Map that maps parameter names to a single String
parameter value</li>
<li>paramValues - a Map that maps parameter names to a String[] of
all values for that parameter</li>
<li>header - a Map that maps header names to a single String
header value</li>
<li>headerValues - a Map that maps header names to a String[] of
all values for that header</li>
<li>initParam - a Map that maps context initialization parameter
names to their String parameter value</li>
<li>cookie - a Map that maps cookie names to a single Cookie object.
</ul>
<blockquote>
<u>Change Parameter
<form action="implicit-objects.jsp" method="GET">
foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
<input type="submit">
</form>
<br>
<code>
<table border="1">
<thead>
<td>EL Expression |
<td>Result
</thead>
<tr>
<td>\${param.foo}
<td>${fn:escapeXml(param["foo"])}
</tr>
<tr>
<td>\${param["foo"]}
<td>${fn:escapeXml(param["foo"])}
</tr>
<tr>
<td>\${header["host"]}
<td>${fn:escapeXml(header["host"])}
</tr>
<tr>
<td>\${header["accept"]}
<td>${fn:escapeXml(header["accept"])}
</tr>
<tr>
<td>\${header["user-agent"]}
<td>${fn:escapeXml(header["user-agent"])}
</tr>
</table>
</code>
</blockquote>
</body>
</html>
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