📄 functions.jsp
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Copyright 2004 The Apache Software Foundation
Licensed 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
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="my" uri="http://jakarta.apache.org/tomcat/jsp2-example-taglib"%>
<html>
<head>
<title>JSP 2.0 Expression Language - Functions</title>
</head>
<body>
<h1>JSP 2.0 Expression Language - Functions</h1>
<hr>
An upgrade from the JSTL expression language, the JSP 2.0 EL also
allows for simple function invocation. Functions are defined
by tag libraries and are implemented by a Java programmer as
static methods.
<blockquote>
<u><b>Change Parameter</b></u>
<form action="functions.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"])} </td>
</tr>
<tr>
<td>\${my:reverse(param["foo"])}</td>
<td>${my:reverse(fn:escapeXml(param["foo"]))} </td>
</tr>
<tr>
<td>\${my:reverse(my:reverse(param["foo"]))}</td>
<td>${my:reverse(my:reverse(fn:escapeXml(param["foo"])))} </td>
</tr>
<tr>
<td>\${my:countVowels(param["foo"])}</td>
<td>${my:countVowels(fn:escapeXml(param["foo"]))} </td>
</tr>
</table>
</code>
</blockquote>
</body>
</html>
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