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Need to subclass a JSP?

Desai Sandeep
Ranch Hand

Joined: Apr 02, 2001
Posts: 1157
Hi,
Could someone explain when do we need to subclass a JSP?Also please mention the steps how this is done, preferrably with an example.
Regards,

------------------
Sandeep Desai
vgdesai@bom3.vsnl.net.in

  1. Sun Certified Java Programmer Scored 93 per cent
  2. Oracle JDeveloper Rel. 3.0 - Develop Database Applications with Java Scored 56 out of 59
  3. IBM Enterprise Connectivity with J2EE Scored 72 per cent
  4. Enterprise Development on the Oracle Internet Platform Scored 44 out of 56


<b>Sandeep</b> <br /> <br /><b>Sun Certified Programmer for Java 2 Platform</b><br /> <br /><b>Oracle Certified Solution Developer - JDeveloper</b><br /><b>-- Oracle JDeveloper Rel. 3.0 - Develop Database Applications with Java </b><br /><b>-- Object-Oriented Analysis and Design with UML</b><br /> <br /><b>Oracle Certified Enterprise Developer - Oracle Internet Platform</b><br /><b>-- Enterprise Connectivity with J2EE </b><br /><b>-- Enterprise Development on the Oracle Internet Platform </b>
Phil Hanna
Ranch Hand

Joined: Apr 05, 2001
Posts: 118
It's easy enough to do:
<%@ page extends="MyJSPSuperClass" %>
but there's little reason to do it. The only benefit you get is that subclasses will inherit any methods you defined in the superclass. But most JSP's contain only a _jspService method anyway. There are usually better ways to make functionality available to JSP's, such as with beans or custom tags.
------------------
Phil Hanna
Author of :
JSP: The Complete Reference
Instant Java Servlets


Phil Hanna<BR>Sun Certified Programmer for the Java 2 Platform<BR>Author of :<BR><A HREF="http://www.amazon.com/exec/obidos/ASIN/0072127686/electricporkchop/107-3548162-1137317" TARGET=_blank rel="nofollow">JSP: The Complete Reference</A><BR><A HREF="http://www.amazon.com/exec/obidos/ASIN/0072124253/electricporkchop/107-3548162-1137317" TARGET=_blank rel="nofollow">Instant Java Servlets</A>
Desai Sandeep
Ranch Hand

Joined: Apr 02, 2001
Posts: 1157
Hi Phil,
Thanks for the response.
Am wondering if there are any performance hits in case we decide to subclass a JSP.Also are there any requirements that the superclass/subclass has to follow.
Regards,
------------------
Sandeep Desai
vgdesai@bom3.vsnl.net.in

  1. Sun Certified Java Programmer Scored 93 per cent
  2. Oracle JDeveloper Rel. 3.0 - Develop Database Applications with Java Scored 56 out of 59
  3. IBM Enterprise Connectivity with J2EE Scored 72 per cent
  4. Enterprise Development on the Oracle Internet Platform Scored 44 out of 56
 
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