Training, Open Source Programming Languages

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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
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 articles
J907 - JSP - JavaServer Pages
  [79] Last day of Java - (2004-10-08)
  [1050] The HTML++ Metalanguage - (2007-01-22)
  [1550] Java (JSP and Servlet examples) live on our server - (2008-02-23)
  [2147] A very easy JSP (Java Server Page) - (2009-05-01)
  [2183] Servlet life cycle, and Java Servlet variable scope - (2009-05-16)
  [2525] Using JSPs, Tag Libraries, Java Beans, Tomcat in one short example - (2009-12-04)
  [3046] Java Beans, tag libraries and JSPs - what and why. - (2010-11-13)
  [3997] Servlet v JSP (Java Server Page). What is the difference? - (2013-02-06)

A507 - Web Application Deployment - Java - Servlets and JSPs
  [479] New servlet from old - (2005-10-28)
  [3044] Changing a Servlet - more that just editing and compiling - (2010-11-12)
  [4431] A Java servlet that is also a stand alone program. And a server that is also a web client. - (2015-02-19)


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Bean Classes in Java and Java Database Connections
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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