This project seems to be at the other end of what I want. I want to
create the client, not the server. I want to submit the file to the
server and read back the server's response.

This is my code so far...

/**
* Created by IntelliJ IDEA.
* User: hallgrimur
* Date: 30.8.2007
* Time: 18:34:12
* To change this template use File | Settings | File Templates.
*/

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public class check {
   /* URL doc2pdf;*/
  // URLConnection conn;

   public static void main(String args[]) {
       if (args.length != 0) {
           System.out.println(
                   "Proper Usage: java FileDownloader RemoteFileURL
LocalFileName");
           System.exit(0);
       }

       try {
           URL site = new URL("http://xxx");
            FileInputStream fis = new FileInputStream("c:\\temp\
\test.xxx");
            );

           HttpURLConnection conn = (HttpURLConnection)
site.openConnection();
           conn.setRequestMethod("POST");
           conn.setInstanceFollowRedirects(true);
                      conn.setDoOutput(true);
                               conn.setRequestProperty
   ("Content-Type", "multipart/form-data");
              conn.setRequestProperty("Content-Length","24470"); //
hard coded for testing
            conn.setRequestProperty("Cache-Control"," no-cache");
           conn.setRequestProperty("Content-Disposition","form-data;
name=\"inputDocument\"; filename=\"test.xxx\""); //name of the submit
form action is inputdocument

           DataOutputStream dos;

           OutputStream os = conn.getOutputStream();
           dos = new DataOutputStream(os);

           int data;
           while ((data = fis.read()) != -1) {
               dos.write(data);

           }
           dos.flush();
           os.flush();
           dos.close();
           os.close();
           DataInputStream in = new
DataInputStream(conn.getInputStream());
           FileOutputStream fo = new FileOutputStream("c:\\temp\
\test.yyy");
           while ((data = in.read()) != -1) {
               fo.write(data);
           }
                       fo.flush();
      //     fo.close();
       //    dos.close();

       }
       catch (Exception e) {
           e.printStackTrace();
       }

   }
}