Struts-EL extension
===================
Introduction
------------
This subproject is an extension of the Struts tag library. Each JSP custom tag
in this library is a subclass of an associated tag in the Struts tag library.
One difference is that this tag library does not use "rtexprvalues", it uses
the expression evaluation engine in the Jakarta Taglibs implementation of the
JSP Standard Tag Library (version 1.0) to evaluate attribute values.
In addition, some of the Struts tags were not ported to this library, as it was
determined that their functionality was entirely supplied by the JSTL. These
particular Struts tags, and the reason for their non-porting will be described
in the documentation for this library.
In order to fully understand the correct utilization of this library, you must
understand the use and operation of the Struts tag library, and the use and
operation of the JavaServer Pages Standard Tag Library (hereafter called the
"JSTL"), along with the expression language (sometimes called the "EL") used
for evaluating attribute values.
Tag Mapping
-----------
In implementing the Struts-EL library, every Struts tag that provides a feature
that is not covered by the JSTL (1.0) library is mapped into the Struts-EL
library. This section reviews which Struts tags are NOT implemented in the
Struts-EL library, and which JSTL tags provide that feature.
Many of the non-porting decisions were based on the fact that the JSTL
expression language itself provides the same functionality. In those cases, in
addition to a possible JSTL tag name, the symbol "EL" will be listed.
Bean Tag Library Tags NOT Implemented in Struts-EL
--------------------------------------------------
Struts Tag JSTL Tag
---------- --------
cookie c:set, EL
define c:set, EL
header c:set, EL
include c:import
parameter c:set, EL
write c:out
Logic Tag Library Tags NOT Implemented in Struts-EL
--------------------------------------------------
Struts Tag JSTL Tag
---------- --------
empty c:if, c:when, EL
equal c:if, c:when, EL
greaterEqual c:if, c:when, EL
greaterThan c:if, c:when, EL
lessEqual c:if, c:when, EL
lessThan c:if, c:when, EL
notEmpty c:if, c:when, EL
notEqual c:if, c:when, EL
(Note that the "iterate" tag was originally ported, even with the presence of
the "c:forEach" tag, as the "indexed tag" functionality was not supported when
using "c:forEach" instead of "logic:iterate". This has since been rectified,
such that the "indexed tag" functionality checks for being contained in a
"c:forEach" tag, in addition to the "logic:iterate" tag. However, the ported
"iterate" tag has not been removed from Struts-EL, for backward compatibility.)
Html Tag Library Tags NOT Implemented in Struts-EL
--------------------------------------------------
None (all of them were ported).
Attribute Mapping
-----------------
At this point of the implementation, there is only one change (to two similar
tags) to the set of attributes between the Struts tags, and the Struts-EL tags.
The "logic:match" and "logic:notMatch" tags have an additional attribute named
"expr", which can take any value, and will be used as the value to compare
against, in addition to the choices of "cookie", "header", "name"/"property",
and "parameter".
Usage Requirements
------------------
The Struts-EL tag library requires the use of the Struts tag library, and the
Java Server Pages Standard Tag Library. It is not necessary for JSP pages
using the Struts-EL tag library to also use the Struts tags or the JSTL tags,
but the Struts and JSTL tag libraries need to be part of the application
utilizing the Struts-EL tag library.
This is because the Struts-EL tag classes are all subclasses of Struts tag
classes, and their implementation uses classes provided by the JSTL.
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jakarta-struts-1.2.2
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jakarta-struts-1.2.2.zip (53个子文件)
jakarta-struts-1.2.2
dist
INSTALL 399B
LICENSE 10KB
contrib
struts-el
webapps
strutsel-exercise-taglib.war 1.15MB
README.txt 4KB
lib
struts-tiles.tld 8KB
struts-bean-el.tld 5KB
struts-logic-el.tld 8KB
fmt-rt.tld 11KB
fmt.tld 12KB
struts-tiles-el.tld 8KB
struts-bean.tld 9KB
jstl.jar 21KB
struts-html-el.tld 66KB
sql-rt.tld 5KB
struts.jar 512KB
struts-nested.tld 64KB
struts-html.tld 66KB
struts-logic.tld 14KB
x.tld 7KB
sql.tld 6KB
x-rt.tld 7KB
c-rt.tld 11KB
c.tld 11KB
struts-el.jar 202KB
standard.jar 505KB
webapps
struts-documentation.war 4.39MB
struts-examples.war 1.05MB
struts-blank.war 981KB
tiles-documentation.war 1.25MB
struts-mailreader.war 1.1MB
README 698B
lib
struts-tiles.tld 8KB
commons-logging.jar 31KB
web-app_2_3.dtd 32KB
commons-digester.jar 107KB
commons-fileupload.jar 22KB
commons-beanutils.jar 116KB
struts-bean.tld 9KB
struts-config_1_2.dtd 33KB
web-app_2_2.dtd 15KB
antlr.jar 350KB
struts.jar 512KB
commons-validator.jar 70KB
struts-nested.tld 64KB
struts-html.tld 66KB
struts-logic.tld 14KB
validator-rules.xml 12KB
struts-config_1_0.dtd 18KB
jakarta-oro.jar 64KB
struts-config_1_1.dtd 34KB
tiles-config_1_1.dtd 12KB
commons-collections.jar 161KB
NOTICE 224B
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