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<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>

Other Tomcat examples (source code examples)

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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 "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

apache, asf, expression, expression, implicit, license, license, map, map, objects, see, string, string, you

The Tomcat implicit-objects.jsp source code

<!--
 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
  </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

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