I would need some insight into what the current applet does and what you
expect to do with JSP before I could make any useful comparison. I don't
really know how to compare these two very different technologies. I suspect
from the way that your question was worded that you have a bit of a
misunderstanding about what JSP gives you. The basic differences are:

- Applets run on the client side and are used primarily to do things that can
not be done using just HTML.

- JSP runs on the server and generates HTML.

Given that, if you already have an applet, I am assuming that it was written
because you wanted to do something that could not be done (or at least done
as well) with HTML. If that is the case, JSP is not going to solve your
problem.