It sounds like you want the client machine to be able to print. Servlets run on the server machine, so they can't use the client machine's printers - not only is the whole http protocol foreign to that process, but the server machine doesn't know anything about the client's printers anyway.
Making a client print using servlets is no different than it would be for any other way of producing web documents. You can return output in a custom format like PDF or MS-WORD, or you can return straight HTML - in either case, the user has to manually select "print" from the file menu (or you have to do something like setup a "print" button on the HTML that's tied to a Javascript that does printing).
You can take a more active role in printing by embedding a
Java applet on the HTML page, but it would have to be signed, since Java's sandbox rules forbid applets from printing otherwise.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.
