Re: 10 JSP tag libraries no programmer should be without

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*10 JSP tag libraries no programmer should be without*

*This blog entry is also available as a TechRepublic
download<http://downloads.techrepublic.com.com/abstract.aspx?docid=301767>
.*

One of JSP's most overlooked features is its ability to work with reusable
code blocks, aka "tag libraries," to add new functionality to a JSP
application. These tag libraries, declared using XML-type markup, provide
ready-to-use widgets that can easily be integrated into a JSP page. They're
also a useful way to separate an application's business
logic<http://techrepublic.com.com/5264-1-0.html?query=application%20development>from
its visual presentation.

There are lots of freely available libraries online — but how do you know
where to start? The 10 JSP tag libraries listed in *Table A* provide a
starting point for your journey into the world of JSP reusability. Take a
look.

*Note:** To install JSP tag libraries, refer to the
documentation<http://jakarta.apache.org/taglibs/>and to the
installation instructions included with each library.
*

Table A

*Package Name*

*Description*
 Standard <http://jakarta.apache.org/taglibs/doc/standard-doc/intro.html> This
library is a must-have, because it incorporates a number of core
enhancements to regular JSP. Some of its features include an XML
manipulation library, an SQL library, special internationalization
capabilities, and support for iterators and other program control
mechanisms. *Use this library when you need advanced flow control
structures, internationalization capabilities, or XML support.*
DateTime<http://jakarta.apache.org/taglibs/doc/datetime-doc/intro.html>
This
library provides various tools for date and time manipulation, including the
ability to retrieve the current date and time, generate lists of days and
months, format dates and times, and convert between time zones. *Use this
library to easily bring date and time manipulation routines into your
application.* Mailer<http://jakarta.apache.org/taglibs/doc/mailer-doc/intro.html>
This
library adds e-mail delivery capabilities to your JSP application by
including support for sending mail through a user-defined SMTP server. It
also includes support for multiple recipients, custom headers, MIME
attachments and error handling.* Use this library when you need to create
and send e-mail messages in a JSP page.*
Cache<http://jakarta.apache.org/taglibs/doc/cache-doc/intro.html> This
library provides a simple caching framework for a Web site. It allows you to
cache sections of a page and reduce response times by rendering the cached
pages to clients.* If your site receives a lot of traffic, use this package
to reduce server load and page processing time by occasionally providing
clients with snapshots from the page cache instead of the "live" page.*
XTags <http://jakarta.apache.org/taglibs/doc/xtags-doc/index.html> This
library provides routines to simplify parsing and transforming XML documents
with XSLT. It can be used to apply an XSLT transformation to an XML
document, add or remove XML nodes, evaluate XPath expressions, and define
template rules. *Use this library when you need advanced XML/XSLT processing
capabilities.* Regexp<http://jakarta.apache.org/taglibs/doc/regexp-doc/intro.html>
This
library allows you to use Perl5-compatible regular expressions in your JSP
applications. The library includes support for Perl's match (m), replace (s)
, and split operators. *Use this library when you need regular expression
support for pattern matching and substitution.* JSP
Controls<http://www.jspcontrols.net/> This
library allows you to create individual page components, such as login forms
or progress bars, which may be independently updated. It is particularly
useful for AJAX applications, although it may also be used in non-AJAX mode.
* Use this library when building AJAX-type JSP applications.*
Pager<http://jsptags.com/tags/navigation/pager/index.jsp> This
library implements a paging system for data sets, making it simple to
incrementally move forward and backward through large data sets (such as
database search results). It also includes various paging styles and support
for a browsable result index. *Use this library when you need a
quick-and-dirty paging system for your application.*
JDBForms<http://jdbforms.sourceforge.net/> This
library makes it possible to link database connections with form elements
and create custom actions to rapidly simplify the development of
database-driven Web applications. It includes support for sorting,
searching, filtering, and styling and uses a SWING-based interface.* Use
this library for rapid development of database-backed JSP applications.* Google
Tag Library <http://google-taglib.sourceforge.net/> This library makes it
possible to perform and process Google searches, check spellings, and access
pages in the Google.com cache.* Use this package to add Google.com search
capabilities to your site or to create a search engine that uses the
Google.com database.*