JavaServer Pages Standard Tag Library

The JavaServer Pages Standard Tag Library (JSTL) is a component of the Java EE Web application development platform. It extends the JSP specification by adding a tag library of JSP tags for common tasks, such as XML data processing, conditional execution, database access, loops and internationalization.

The JavaServer Pages Standard Tag Library (JSTL) encapsulates core functionality common to many JSP applications. Instead of mixing tags from numerous vendors in your JSP applications, JSTL allows you to employ a single, standard set of tags. This standardization allows you to deploy your applications on any JSP container supporting JSTL and makes it more likely that the implementation of the tags is optimized.
JSTL has tags such as iterators and conditionals for handling flow control, tags for manipulating XML documents, internationalization tags, tags for accessing databases using SQL, and commonly used functions.

This standardization lets you learn a single tag and use it on multiple JSP containers. Also, when tags are standard, containers can recognize them and optimize their implementations.

JSTL was developed under the Java Community Process (JCP) as Java Specification Request (JSR) 52. On May 8, 2006, JSTL 1.2 was released, followed by JSTL 1.2.1 on Dec 7, 2011
JSTL provides an effective way to embed logic within a JSP page without using embedded Java code directly. The use of a standardized tag set, rather than breaking in and out of Java code, leads to more maintainable code and enables separation of concerns between the development of the application code and user interface.

There are a total of six JSTL tag library descriptors:

⇨ http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/c/tld-summary.html

Core library. E.g.and

⇨ http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/fmt/tld-summary.html

● i18n-capable formatting library

⇨ http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/sql/tld-summary.html

● Database tag library, contains tags for querying, creating and updating database table.

⇨ http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/x/tld-summary.html

● XML library

⇨ http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/fn/tld-summary.html

● functions library

⇨ http://docs.oracle.com/javaee/6/api/javax/servlet/jsp/jstl/tlv/package-summary.html

● TLVs allow translation-time validation of the XML view of a JSP page. The TLVs provided by JSTL allow tag library authors to enforce restrictions regarding the use of scripting elements and permitted tag libraries in JSP pages.

⇨ In addition to JSTL, the JCP has the following JSRs to develop standard JSP tag libraries:

● JSR 128: JESI – JSP Tag Library for Edge Side Includes (inactive)
● JSR 267: JSP Tag Library for Web Services

References : wikipedia | oracle « Next Post » share on :        :  

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