Also tell me how should i map servlet if i am putting my servlet files in a different folder.
What you are calling folders are actually packages, so there's no problem putting your servlets in different packages.
For example, two different servlets in two different packages :
/myapp/WEB-INF/classes/management/AdminServlet.class
/myapp/WEB-INF/classes/user/ListingServlet.class
You can declare them separately.
I leave you figure out how to map different urls to different servlets.