<%@ 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"]))}

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"]))}