JSTL Functions

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JSTL Functions

...

</c:forEach>

JSTL Functions

Table 78

lists the JSTL functions.

TABLE 78

Functions

Area

Function

Tags

Prefix

Functions

Collection length

length

String manipulation toUpperCase, toLowerCase

substring

, substringAfter, substringBefore

trim

replace

indexOf

, startsWith, endsWith, contains,

containsIgnoreCase

split

, join

escapeXml

Although the java.util.Collection interface defines a size method, it does not conform to
the JavaBeans component design pattern for properties and so cannot be accessed by using the
JSP expression language. The length function can be applied to any collection supported by the
c:forEach

and returns the length of the collection. When applied to a String, it returns the

number of characters in the string.

For example, the index.jsp page of the hello1 application introduced in

Chapter 3, "Getting

Started with Web Applications"

uses the fn:length function and the c:if tag to determine

whether to include a response page:

<%@ taglib uri=

"http://java.sun.com/jsp/jstl/core"

prefix=

"c" %>

<%@ taglib uri=

"http://java.sun.com/jsp/jstl/functions"

prefix=

"fn" %>

<html>

<head><title>Hello</title></head>

...

<input type=

"text" name="username" size="25">

<p></p>

<input type=

"submit" value="Submit">

<input type=

"reset" value="Reset">

JSTL Functions

The Java EE 5 Tutorial · September 2007

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