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Using JSTL

JSTL includes a wide variety of tags that naturally fit into discrete functional areas. Therefore, JSTL is exposed via multiple URIs to clearly show the functional areas it covers and give each area its own namespace. Table 6-1 summarizes these functional areas, subfunctions in each area, tags in each subfunction, and the prefixes used in the Duke's Bookstore application.

Table 6-1 JSTL Tags 

Area	Function	Tags	Prefix
Core	Expression Language Support	catch out remove set	c
	Flow Control	choose   when   otherwise forEach forTokens if
	URL Management	import   param redirect   param url   param
XML	Core	out parse set	x
	Flow Control	choose   when   otherwise forEach if
	Transformation	transform   param
I18n	Locale	setLocale	fmt
	Message formatting	bundle message   param setBundle
	Number and date formatting	formatNumber formatDate parseDate parseNumber setTimeZone timeZone
Database		setDataSource	sql
	SQL	query   dateParam   param transaction update   dateParam   param

The URIs used to access the libraries are:

Core: http://java.sun.com/jstl/core
XML: http://java.sun.com/jstl/xml
Internationalization: http://java.sun.com/jstl/fmt
SQL: http://java.sun.com/jstl/sql

The JSTL tag libraries comes in two versions (see Twin Libraries). The URIs for the JSTL-EL library are as shown above. The URIs for the JSTL-RT library are named append _rt to the end.

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