Sending xml file from client to servlet

Hi,
I am writing the server component of an applcation, such that it will receive xml files from the clients(standalone application similar to javaSwing stuff but it's coded in C#), and the servlet will have to extract the data from the xml file and update the mySql database. it will also fulfill the client's request for xmlFiles (and extract data from DB, format to xml file and send back to client)
I'm new to implementing the servlet receiving files from clients so would need some help.
I've got 3 questions to ask:
1) How does the servlet receive/returns the xml file from the client as a series of httpPost request/response. Do i send a File or the file's contents as a String to/from the client?
2) Is it also a must to use socket for the file transfers? I have read in other posts about sockets as well as HttpURLConnection but i don't quite understand.
3) When I send a file back to the client(client is standalone application written in C# whereas server is coded in java), what do i specify for the HttpResponse.setContentType() in my servlet? (i'm returning the xml file to client)
Would really appreciate for any help rendered. If you have any useful links, would appreciate them too. Thanks a lot.
Karen

I've got 3 questions to ask:
1) How does the servlet receive/returns the xml file
from the client as a series of httpPost
request/response. Do i send a File or the file's
contents as a String to/from the client?The server will listen on some port for requests. The client has to open a socket to this server to send the file as string to the server.
see http://java.sun.com/docs/books/tutorial/networking/index.html
>
2) Is it also a must to use socket for the file
transfers? I have read in other posts about sockets as
well as HttpURLConnection but i don't quite
understand.You use HttpURLConnection to make a request using the http protocol, instead of opening a socket and then writing the html headers yourself.
3) When I send a file back to the client(client is
standalone application written in C# whereas server is
coded in java), what do i specify for the
HttpResponse.setContentType() in my servlet? (i'm
returning the xml file to client)Its up to your receiving program how to interpret this though, so you probably dont need this.

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