Monitoring the progress of an HTTP File Request

Question

Hi,
I've written a little applet used to sending Files to a PHP-Application. Everything works fine. Now I try to monitor the progress of the upload and I have a little problem. This are the main functions:
     public void addFile (String name, File file) throws IOException {
          this.bytesComplete = file.length();
          addFile(name, file.getPath(), new FileInputStream(file));
     public void addFile (String name, String filename, InputStream is) throws IOException {
          writeBoundary();
          writeName(name);
          write("; filename=\"");
          write(filename);
          write('"');
          newline();
          write("Content-Type: ");
          String type = connection.guessContentTypeFromName(filename);
          if (type == null)  {
               type = "application/octet-stream";
          writeln(type);
          newline();
          pipe(is, os);
          newline();
     private void pipe(InputStream in, OutputStream out) throws IOException {
          this.bytesWritten = 0;
          byte[] buf = new byte[4096];
          int nread;
          int navailable;
          int total = 0;
          synchronized (in) {
               while((nread = in.read(buf, 0, buf.length)) >= 0) {
                    out.write(buf, 0, nread);
                    out.flush();
                    total += nread;
                    this.bytesWritten += nread;
          out.flush();
          buf = null;
       }Somewhere else the function is called
     addFile ("file", filelist.get(i));Works fine, but now I've tried to monitor the actual progress by adding the following line between out.write and out.flush in the pipe-method
int actualStatus = Math.round (this.bytesWritten / this.bytesComplete * 100);
addProgress (actualStatus); // this method sets a JProgressBarAnd now something strange happens. It seems that all the data first is read so my progress goes to 100% in half a second and then is written later. I understand that os.flush only suggests (!) to write the data but not forces to do so.
Is there a way to monitor the progress in real-time, so I can show a user how many data already is transferred? To do a real forced flush? Thanks for your help

Answer 1

Maybe it's a bug: just found this: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5026745
Does maybe anybody know a work-around?
Edited by: thomwiesel on 23.03.2010 13:44
Edited by: thomwiesel on 23.03.2010 13:45