Hi,
First things first : you'll get much more help if you put this query in servlet forum.
Apart from that, if you really want to write a good code, I would not recommend writing a servlet which looks like a bean (i.e. all private fields, getters and setters et-cetera).
Much better would be to use MVC
pattern. It looks like you've got your code ready for desktop environment (employee and registration class etc.)
All you'll have to do is:
1) Create a 'view' (which can be as simple as HTML page, or a complex
JSP or anything from which you can call servlet)
2) Create a 'controller' (here, it would be servlet - which will accept the requests from view; not necessarily that you'll have only one controller throughout your code)
3) Create a 'model' - which is your existing code. Controller, depending on the nature of requests, will invoke respective methods on corresponding objects. Of course, you can write all your business logic in servlet, but then, it would not be
good code
If you don't know anything about servlet, MVC etc. then I'll suggest to go through some basic book like head first servlet & jsp.
I hope this helps.