tomcat-uid/webapps/examples/jsp/jsp2/el/implicit-objects.jsp.html - UniIdentify/tomcat - Gitiles

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 &lt;!--
  Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 -->
 &lt;%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

 &lt;html>
   &lt;head>
     &lt;title>JSP 2.0 Expression Language - Implicit Objects&lt;/title>
   &lt;/head>
   &lt;body>
     &lt;h1>JSP 2.0 Expression Language - Implicit Objects&lt;/h1>
     &lt;hr>
     This example illustrates some of the implicit objects available
     in the Expression Lanaguage.  The following implicit objects are
     available (not all illustrated here):
     &lt;ul>
       &lt;li>pageContext - the PageContext object&lt;/li>
       &lt;li>pageScope - a Map that maps page-scoped attribute names to
           their values&lt;/li>
       &lt;li>requestScope - a Map that maps request-scoped attribute names
           to their values&lt;/li>
       &lt;li>sessionScope - a Map that maps session-scoped attribute names
           to their values&lt;/li>
       &lt;li>applicationScope - a Map that maps application-scoped attribute
           names to their values&lt;/li>
       &lt;li>param - a Map that maps parameter names to a single String
           parameter value&lt;/li>
       &lt;li>paramValues - a Map that maps parameter names to a String[] of
           all values for that parameter&lt;/li>
       &lt;li>header - a Map that maps header names to a single String
           header value&lt;/li>
       &lt;li>headerValues - a Map that maps header names to a String[] of
           all values for that header&lt;/li>
       &lt;li>initParam - a Map that maps context initialization parameter
           names to their String parameter value&lt;/li>
       &lt;li>cookie - a Map that maps cookie names to a single Cookie object.&lt;/li>
     &lt;/ul>

     &lt;blockquote>
       &lt;u>&lt;b>Change Parameter&lt;/b>&lt;/u>
       &lt;form action="implicit-objects.jsp" method="GET">
 	  foo = &lt;input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
           &lt;input type="submit">
       &lt;/form>
       &lt;br>
       &lt;code>
         &lt;table border="1">
           &lt;thead>
 	    &lt;td>&lt;b>EL Expression&lt;/b>&lt;/td>
 	    &lt;td>&lt;b>Result&lt;/b>&lt;/td>
 	  &lt;/thead>
 	  &lt;tr>
 	    &lt;td>\${param.foo}&lt;/td>
 	    &lt;td>${fn:escapeXml(param["foo"])}&amp;nbsp;&lt;/td>
 	  &lt;/tr>
 	  &lt;tr>
 	    &lt;td>\${param["foo"]}&lt;/td>
 	    &lt;td>${fn:escapeXml(param["foo"])}&amp;nbsp;&lt;/td>
 	  &lt;/tr>
 	  &lt;tr>
 	    &lt;td>\${header["host"]}&lt;/td>
 	    &lt;td>${fn:escapeXml(header["host"])}&amp;nbsp;&lt;/td>
 	  &lt;/tr>
 	  &lt;tr>
 	    &lt;td>\${header["accept"]}&lt;/td>
 	    &lt;td>${fn:escapeXml(header["accept"])}&amp;nbsp;&lt;/td>
 	  &lt;/tr>
 	  &lt;tr>
 	    &lt;td>\${header["user-agent"]}&lt;/td>
 	    &lt;td>${fn:escapeXml(header["user-agent"])}&amp;nbsp;&lt;/td>
 	  &lt;/tr>
 	&lt;/table>
       &lt;/code>
     &lt;/blockquote>
   &lt;/body>
 &lt;/html>
 </pre></body></html>
	<html><body><pre>
	<!--
	Licensed to the Apache Software Foundation (ASF) under one or more
	contributor license agreements. See the NOTICE file distributed with
	this work for additional information regarding copyright ownership.
	The ASF licenses this file to You under the Apache License, Version 2.0
	(the "License"); you may not use this file except in compliance with
	the License. You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	-->
	<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

	<html>
	<head>
	<title>JSP 2.0 Expression Language - Implicit Objects</title>
	</head>
	<body>
	<h1>JSP 2.0 Expression Language - Implicit Objects</h1>
	<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>
	<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.</li>
	</ul>

	<blockquote>
	<u><b>Change Parameter</b></u>
	<form action="implicit-objects.jsp" method="GET">
	foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
	<input type="submit">
	</form>
	<br>
	<code>
	<table border="1">
	<thead>
	<td><b>EL Expression</b></td>
	<td><b>Result</b></td>
	</thead>
	<tr>
	<td>\${param.foo}</td>
	<td>${fn:escapeXml(param["foo"])}&nbsp;</td>
	</tr>
	<tr>
	<td>\${param["foo"]}</td>
	<td>${fn:escapeXml(param["foo"])}&nbsp;</td>
	</tr>
	<tr>
	<td>\${header["host"]}</td>
	<td>${fn:escapeXml(header["host"])}&nbsp;</td>
	</tr>
	<tr>
	<td>\${header["accept"]}</td>
	<td>${fn:escapeXml(header["accept"])}&nbsp;</td>
	</tr>
	<tr>
	<td>\${header["user-agent"]}</td>
	<td>${fn:escapeXml(header["user-agent"])}&nbsp;</td>
	</tr>
	</table>
	</code>
	</blockquote>
	</body>
	</html>
	</pre></body></html>