Answer Posted / tarik makhija

From a coding point of view if we want to send some text as
response back to client browser

The Servlet way is:
response.write("<p>hello</P>");

The JSP is:
<p>hello</P>
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JavaServer Pages (JSP) is a Java technology that allows
software developers to create dynamically-generated web
sites, with HTML, XML, or other document types, in response
to a Web client request.

So Sending information to clients without manipulating it
JSP is best i.e sending same output to every user of your
web applcation. JSP is used to Present the [ HTML/XML
output ] to user also called Presenation Logic.

Example : Users A, B, C enter wrong password while logging
to an application they will be shown same Message as JSP
Page Output: "Invalid Username/Password entered by the
user".

Since Here Output for each user is same so JSP is used.
------------------------------------------------------------
But for doing serious computations on data before (ie
Business logic) sending the respone back Servlets are best.

Servlets are used when you want to do some processing on
data submitted by the user, For example : Computing Income
Tax for a particular user based on criteria selected by the
user.

Income Tax computation result for a User A having Income 2
Lakhs per year will be different from User B having Income
5 Lakhs. So here we will use Servlet to compute the Income
Tax.


This allows for isolation of Business logic[Computing
Income Tax] from Presentation logic[Showing same message -
"Invalid Username/Password entered by the user"].

------------------------------------------------------------
Performance JSP vs Servlet :
JSP`s are internally compiled into Servlet code by JSP
Compiler. So If a request is mde to JSP page from Browser
for the first time JSP page will take more time to load
into the browser as it will be first compiled into a
servlet and then that [JSP converted Servlet] will be
executed.
Next time you request the same JSP page it will load faster
as it is already converted to servlet so servlet code will
execute then.
------------------------------------------------------------
Application Server Re-Start :

Servlets :
If Some Change is made in Servlet code then Application
Server on which servlet runs require to be re-started so as
to reflect the new change to the users of the application.

JSP : There is no need to re-start the Application Server
if JSP code change is made.
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