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<%--
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 Licensed to the Apache Software Foundation (ASF) under one or more
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  contributor license agreements.  See the NOTICE file distributed with
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  this work for additional information regarding copyright ownership.
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  The ASF licenses this file to You under the Apache License, Version 2.0
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  (the "License"); you may not use this file except in compliance with
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  the License.  You may obtain a copy of the License at
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      http://www.apache.org/licenses/LICENSE-2.0
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  Unless required by applicable law or agreed to in writing, software
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  distributed under the License is distributed on an "AS IS" BASIS,
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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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  See the License for the specific language governing permissions and
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  limitations under the License.
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--%>
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<%@page contentType="text/html; charset=UTF-8" %>
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<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
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<html>
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  <head>
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    <title>JSP 2.0 Expression Language - Implicit Objects</title>
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  </head>
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  <body>
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    <h1>JSP 2.0 Expression Language - Implicit Objects</h1>
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    <hr>
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    This example illustrates some of the implicit objects available
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    in the Expression Language.  The following implicit objects are
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    available (not all illustrated here):
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    <ul>
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      <li>pageContext - the PageContext object</li>
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      <li>pageScope - a Map that maps page-scoped attribute names to
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          their values</li>
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      <li>requestScope - a Map that maps request-scoped attribute names
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          to their values</li>
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      <li>sessionScope - a Map that maps session-scoped attribute names
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          to their values</li>
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      <li>applicationScope - a Map that maps application-scoped attribute
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          names to their values</li>
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      <li>param - a Map that maps parameter names to a single String
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          parameter value</li>
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      <li>paramValues - a Map that maps parameter names to a String[] of
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          all values for that parameter</li>
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      <li>header - a Map that maps header names to a single String
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          header value</li>
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      <li>headerValues - a Map that maps header names to a String[] of
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          all values for that header</li>
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      <li>initParam - a Map that maps context initialization parameter
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          names to their String parameter value</li>
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      <li>cookie - a Map that maps cookie names to a single Cookie object.</li>
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    </ul>
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    <blockquote>
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      <u><b>Change Parameter</b></u>
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      <form action="implicit-objects.jsp" method="GET">
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          foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
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          <input type="submit">
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      </form>
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      <br>
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      <code>
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        <table border="1">
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          <thead>
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            <td><b>EL Expression</b></td>
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            <td><b>Result</b></td>
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          </thead>
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          <tr>
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            <td>\${param.foo}</td>
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            <td>${fn:escapeXml(param["foo"])}&nbsp;</td>
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          </tr>
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          <tr>
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            <td>\${param["foo"]}</td>
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            <td>${fn:escapeXml(param["foo"])}&nbsp;</td>
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          </tr>
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          <tr>
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            <td>\${header["host"]}</td>
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            <td>${fn:escapeXml(header["host"])}&nbsp;</td>
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          </tr>
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          <tr>
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            <td>\${header["accept"]}</td>
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            <td>${fn:escapeXml(header["accept"])}&nbsp;</td>
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          </tr>
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          <tr>
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            <td>\${header["user-agent"]}</td>
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            <td>${fn:escapeXml(header["user-agent"])}&nbsp;</td>
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          </tr>
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        </table>
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      </code>
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    </blockquote>
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  </body>
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</html>