Re: Role of servlet

In one scenario, the "controller servlet" is used to manage the flow 
of the web app between the JSPs, with JSP being used primarily to 
display the results.  The controller servlet uses javabeans to do 
things like getting a database connection (often from a pool of 
connections) and performing typical operations on the database 
(insert, update, etc.) using information stored in the request object 
passed on by the controller servlet.  The result set is returned to a 
JSP for display.  The controller servlet might also perform 
authentication of the user and prevent a command from being done 
twice (when a page is reloaded, for example).  Summary: A JSP 
initially passes a request object to the controller servlet, which 
figures out which javabean to use and which JSP to pass the results 
onto next, based on parameters stored in the request object.

There are some great books out there that do a good job of describing 
this.  One is called "Web Development with Java Server Pages".  It 
has been out for awhile, but still has good info, and you can 
probably get it "used" for about $10 - $15.

Hope this helps.

G. Strackbein 
--- In EJB-Developer@y..., "Nellai..." <nellaigi@y...> wrote:
> Hi,
>   Can anyone tell me about the role of a servlet in
> the case of using jsp,javabeans,servlet and a database
> in a typical scenario? 
> 
> Also let me know about the design patterns available
> with using J2EE,Servlets &JSP combination.
> 
> Regds,
> Nellaiyapan R.G.
> 
> 
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