90 lines
3.3 KiB
Plaintext
90 lines
3.3 KiB
Plaintext
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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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<%@ 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 Lanaguage. 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"])} </td>
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</tr>
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<tr>
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<td>\${param["foo"]}</td>
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<td>${fn:escapeXml(param["foo"])} </td>
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</tr>
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<tr>
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<td>\${header["host"]}</td>
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<td>${fn:escapeXml(header["host"])} </td>
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</tr>
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<tr>
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<td>\${header["accept"]}</td>
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<td>${fn:escapeXml(header["accept"])} </td>
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</tr>
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<tr>
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<td>\${header["user-agent"]}</td>
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<td>${fn:escapeXml(header["user-agent"])} </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>
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