By Sue Spielman
Net builders and web page authors who use JavaServer Pages (JSP) recognize that it really is a lot more straightforward and effective to enforce web content with out reinventing the wheel every time. as a way to shave worthy time from their improvement schedules, those that paintings with JSP have created, debugged, and used customized tags-a set of programmable activities that supply dynamic habit to static pages-paving the way in which in the direction of a extra universal, typical method of utilizing Java know-how for internet improvement. the most important enhance to this attempt despite the fact that has just recently arrived within the kind of a customary set of tag libraries, referred to as the JSTL, which now presents a variety of performance and offers web content authors a way more simplified method of enforcing dynamic, Java-based sites.
JSTL: sensible consultant for JSP Programmers is a well timed source for an individual drawn to doing large-scale J2EE program improvement. It sticks to the most gains of the JSTL in order that builders would not have to sift via pointless information to start utilizing the tags and dealing with the expression language. Sue Spielman's straight-forward, sensible process is greater with quite a few code samples and insightful descriptions to make studying the JSTL a quick and simply complete task.
- Written through a best-selling writer with a wealth of improvement adventure and popularity within the Java community.
- Covers the middle parts of the JSTL together with the 4 average tag libraries (core, internationalization/format, XML, and SQL) and expression language.
- Includes a reference part for all the tabs and attributes inside the JSTL.
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Extra resources for JSTL : practical guide for JSP programmers
Sample text
The tag library includes the two primary parts: the tag handler, and the TLD file. jsp file to use the custom tag library we defined, we can have a cleaner JSP file with no Java code. 8. 8 Hello My Friend, Custom Tag Style <%@ page contentType="text/html; charset=UTF-8" %> <%@ taglib uri="/jstlpg/samples/SampleTaglib" prefix="jstlpg" %>
20 Chapter 1: Introduction ■The JSP is now more maintainable, easier to read, and bug free (we hope).
There are two ways provided by the EL to access data structures. The operators are . and []. Using these operators makes it easy to access encapsulated data. If fact, we’ve already seen this access in the example above using the conditional if tag. Using the . (also called dot) notation is a shortcut for accessing an object’s property. title}"/> is currently out of stock. We access the value of title, which is a property of the book object. The [] is used for accessing collections. This includes lists, maps, and arrays.
5 Default Values Another valuable feature of the JSTL is that it supports default values for expressions. This is very handy for allowing JSPs to handle simple errors gracefully instead of throwing a dreaded NullPointerException. Using default values allows for a better flow within the JSP and allows the user to have a better experience. Most common error situations can be avoided, thereby allowing the users to continue on their merry way without having an error page displayed. The default values are type correct according to what the EL indicates and they allow the JSP to recover from what would have been an error.