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What is a JSP tag library?

JSP tags v JSP source comparison 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!


How a JSP tag converts to the same class code as a piece of Java code 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
A507 - Web Application Deployment - Java - Servlets and JSPs
  [4431] A Java servlet that is also a stand alone program. And a server that is also a web client. - (2015-02-19)
  [3997] Servlet v JSP (Java Server Page). What is the difference? - (2013-02-06)
  [3044] Changing a Servlet - more that just editing and compiling - (2010-11-12)
  [2525] Using JSPs, Tag Libraries, Java Beans, Tomcat in one short example - (2009-12-04)
  [479] New servlet from old - (2005-10-28)

J907 - JSP - JavaServer Pages
  [3046] Java Beans, tag libraries and JSPs - what and why. - (2010-11-13)
  [2183] Servlet life cycle, and Java Servlet variable scope - (2009-05-16)
  [2147] A very easy JSP (Java Server Page) - (2009-05-01)
  [1550] Java (JSP and Servlet examples) live on our server - (2008-02-23)
  [1050] The HTML++ Metalanguage - (2007-01-22)
  [79] Last day of Java - (2004-10-08)


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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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