Basic query abt business logic

Question

i need to have a website which will search from a database and display results is it advisable to have my business logic (i.e database query)in servlet only since it is a small aplication or i should have a different file for business logic?
I am very new to this technologies no do not have much knowledge.
i am thinking to use jsp for display since it automatically handles sessions.
tia

Answer 1

so i should have my database query logic
based on search parameters in my servlet only???No
should have a different file for business logic?Yes. Your servlet can create an object of a Search class(in a different file) and call its methods to do the searching. Then your servlet can attach the result to the request:
request.setAttribute("someName", SearchResults);and then forward the request to the JSP using a RequestDispatcher:
RequestDispatcher view = request.getRequestDispatcher("/results.jsp");
view.forward(request, response);Then your jsp can retrieve the data:
SearchResults data  = (SearchResults) request.getAttribute("someName");MVC. Model View Controller:
Controller = servlet
Model = Search class
View = jsp
Your directory structure might look something like this:
yourApp
--searchForm.htm
--results.jsp
--WEB-INF
-------classes
-----------com
---------------myWebsite
--------------------web
--------------------------MyServlet.class (package com.myWebsite.web;)
--------------------model
--------------------------Search.class (package com.myWebsite.model;)