How to write file to server using applet?

Please help!!!!!!!!!!
Why didn't this work?
URLConnection ucon = url.openConnection();
               ucon.connect();
               ObjectOutputStream outStream = new ObjectOutputStream(new BufferedOutputStream(ucon.getOutputStream()));
               outStream.writeObject(linkHolder);
               outStream.close();
.............As my applet run, the message printed out with my catch is: "java.net.UnknownSerivceException: Protocal doesn't support this output."
However, the reading from server is fine:
ObjectInputStream inStream = new ObjectInputStream(new BufferedInputStream(url.openStream()));
         links = (LinkHolder)inStream.readObject();
         inStream.close();
....I really appreciate for your help.
JTom

This file resides on server not local machine. I'm just testing on my local PC for now.
By the way, applet doesn't allow any kind of communication to client machine or others, but only to the server it resides in; according to the specs.
To get a url connection you need a server. You send
the output to the server(some servlet or similar
program running on server).
But for file you don't need a server. You can open a
file on your local machine if just have file
permissions. There is no server involved here.

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