Answer Posted / swati

Hi Friends,

I am also hunting for job like you guys. Thanks for the
requests for clarification of web application as 2-tier.

for eg : lets us take an example of user logging into
portal.

the webpage(where you are providing username and password)
is a front end page and its clear we treat it as one tier.
Once you enter username and password, these must be
validated. There are two options, you can validate in the
same jsp page or you can use another servlet to validate
these user credentials and delegate the request to
appropriate page on success.

Here the point is if you are validating the username and
password in the same jsp which means the frontend page(lets
think as a jsp) is directly interacting with
database...then we can treat it as a two tier. Incase if
this jsp is again talking to other servlet saying..."hey
servlet...please validate this user id and password and
decide yourselves what ever you want to do if success or
failuer? " then simply this servlet will validate and
forward to database if success otherwise it will forward
to error.jsp saying invalid username and password..so this
can be treated as three tier.

Most of the time two tier is not recommended
because..According to Jsp specification..jsp are good to
use as presentation purpose but not for controlling and
performing bussiness logic..This is what all I know


regds,
swati

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