The J2EE™ Tutorial Second Edition

Functions

Table 14-9 lists the JSTL functions.

Table 14-9. Functions

Area	Function	Tags	Prefix
Functions	Collection length	length	fn
	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 via 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