<%-- 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. --%> <%@page contentType="text/html; charset=UTF-8" %> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <%@ taglib prefix="my" uri="http://tomcat.apache.org/jsp2-example-taglib"%> JSP 2.0 Expression Language - Functions

JSP 2.0 Expression Language - Functions

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.
Change Parameter
foo =

EL Expression Result
\${param["foo"]} ${fn:escapeXml(param["foo"])} 
\${my:reverse(param["foo"])} ${my:reverse(fn:escapeXml(param["foo"]))} 
\${my:reverse(my:reverse(param["foo"]))} ${my:reverse(my:reverse(fn:escapeXml(param["foo"])))} 
\${my:countVowels(param["foo"])} ${my:countVowels(fn:escapeXml(param["foo"]))}