Simple web app idea - how to implement the servlet?

I want to make a simple web application, that all it does is to allow a user to record his voice, using his microphone, and then save this audio file on my server (maybe allow him to hear it again, later). BUT -
I don't quite understand how it should work - I guess there is a java library to do the recording, that's not a problem, but how can I record via the web??
how can I use the java servlet (which is from the examples I've seen usually displays some new content upon a certain request, nothing more..) to do it?
(I mean. I don't fully understand the communication with the servlet, I think. I know that the servlet has a method for dealing with POST messages, for examlpe. but how can it help me do what I described above?)
hope I made my self clear, thanks :)
Kogan.

A Servlet is normally there to pre/postprocess requests. For example obtaining a list of records from DB and forwarding the request to a JSP for presentation. Or gathering, validating and/or converting request parameters from a form submit and preparing the result and forwarding the request to a JSP for presentation.
Now, you want to record a voice. If you want to do this with Java, then you'll need to run this at the client machine. As servlets run at the server machine, it can't record the voice, it can at highest only retrieve the voice stream and store it at the database or local disk. To record a voice using a web application, best what you can do is to create a Java applet or Java web start application which you on its turn embed in a JSP page for presentation. The applet or application on its turn can make use of the JMF API to record a voice. Then let the applet or application send the stream to the servlet so that it can process it.
Techniques you'll need to learn about:
1) Applet or web start application (JNLP).
2) AWT and Swing (for UI of applet or application).
3) JSP and HTML (to embed applet or application in web page).
4) JMF (to record voice).
5) Servlets (to process URL requests, the request body may contain the voice stream).

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