Retiring, March 2020 - sorry, you have missed our final public course.
The Coronavirus situation has lead us to suspend public training - which was on the cards anyway, with no plans to resume
Please ask about private 'maintenance' training for Python, Tcl, Perl, PHP, Lua, etc
Happily continuing private consultancy / programming work
What is a JSP tag library?
Java programming is very different to writing HTML - web page authors expect a tag based language ... so why not provide one that provides some Java functionality? That's what tag libraries do. My slide shows a piece of Java program - defining a variable and calling a constructor; it's a pretty common thing to code and only two elements change - the name of the class and the name of the object created. And - because the java language and also the compiled class far format are published - geeks with enough knowledge could work out the class file data from the source code.
Using a tag library, a different way is chosen to specify the two things that vary - they're specified as attributes to a tag (and the tag type is used to select which standard profile is required). In that way, all the vital information that is needed to define the Java functionality is actually included within the tag, and there's no Java source code left at all!
A JSP is a web page in which Java is embedded within HTML, with the server processing it and sending only pure HTML to the browser. Using tage libraries, some (or all) of that Java can be replaced by tags which are much quicker to interpret, much more familiar-looking to the web developer, and will be set up to offer a restricted range of options only so they'll be more secure and less error prone. (written 2009-05-01, updated 2009-05-02)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesA507 - Web Application Deployment - Java - Servlets and JSPs 
A Java servlet that is also a stand alone program. And a server that is also a web client. - (2015-02-19) 
Servlet v JSP (Java Server Page). What is the difference? - (2013-02-06) 
Changing a Servlet - more that just editing and compiling - (2010-11-12) 
Using JSPs, Tag Libraries, Java Beans, Tomcat in one short example - (2009-12-04) 
New servlet from old - (2005-10-28)J907 - JSP - JavaServer Pages 
Java Beans, tag libraries and JSPs - what and why. - (2010-11-13) 
Servlet life cycle, and Java Servlet variable scope - (2009-05-16) 
A very easy JSP (Java Server Page) - (2009-05-01) 
Java (JSP and Servlet examples) live on our server - (2008-02-23) 
The HTML++ Metalanguage - (2007-01-22) 
Last day of Java - (2004-10-08)
Some other Articles
No subject or title?Bean Classes in Java and Java Database ConnectionsClass Loading and Variable Conversion in JavaMy four feet!What is a JSP tag library?Routers, Firewalls and multilayer serversRouting Network Traffic - Proxies, Redirects and DNSVariable scope in Java Servlets and other web applicationsAn evening excursion to Devizes and Avebury
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