JSTL comes in a number of flavors and implementations. The JSRs are the specifications.
A good tutorial on the issues can be found on Herong’s Tutorial Notes.
The JSTL libraries come in two flavors, the “rt” and the “el” libraries:
RT (run-time)
The “rt” tag libraries will accept request-time expressions for most attribute values as in:
<c:out value='<%= ((Foo)session.getAttribute("foo")).getBar()'%>/>EL (Expression Library)
The tag libraries without the “rt” do not accept Request-time expressions but operate on EL (expression language) — for example:
<c:out value='${sessionScope.foo.bar}'/>
You can use both the “rt” and the non-rt (EL-supporting) tags in your JSP — just be sure and give them different prefixes in the taglib directives. In the long term, you want to get away from the rt tags – and use EL instead.
JSTL 1.0
Requirements: JSP 1.2 container Reference implementation:
http://www.apache.org/dist/jakarta/taglibs/standard/
EL-based tag libraries
|
EL-based tag libraries |
|||
|
Functional Area |
URI |
Prefix |
|
| Core | http://java.sun.com/jstl/core | C | |
| XML Processing | http://java.sun.com/jstl/xml | X | |
| Internationalization | http://java.sun.com/jstl/fmt | Fmt | |
| Database Access | http://java.sun.com/jstl/sql | Sql | |
|
Runtime-based tag libraries |
||
|
Functional Area |
URI |
Prefix |
| Core | http://java.sun.com/jstl/core_rt | c_rt |
| XML Processing | http://java.sun.com/jstl/xml_rt | x_rt |
| Internationalization | http://java.sun.com/jstl/fmt_rt | fmt_rt |
| Database Access | http://java.sun.com/jstl/sql_rt | sql_rt |
JSTL 1.2 (May 8, 2006)
Requirements: JSP 2.0 container Reference implementation:
http://www.apache.org/dist/jakarta/taglibs/standard/
|
EL-based tag libraries |
|||
|
Functional Area |
URI |
Prefix |
|
| Core | http://java.sun.com/jsp/jstl/core | C | |
| XML Processing | http://java.sun.com/jsp/jstl/xml | X | |
| Internationalization | http://java.sun.com/jsp/jstl/fmt | Fmt | |
| Database Access | http://java.sun.com/jsp/jstl/sql | Sql | |
|
Runtime-based tag libraries |
||
|
Functional Area |
URI |
Prefix |
| Core | http://java.sun.com/jsp/jstl/core_rt | c_rt |
| XML Processing | http://java.sun.com/jsp/jstl/xml_rt | x_rt |
| Internationalization | http://java.sun.com/jsp/jstl/fmt_rt | fmt_rt |
| Database Access | http://java.sun.com/jsp/jstl/sql_rt | sql_rt |
