Downloading a file in Linux

Hi,

I use the following function to download a jar file from my website:

public synchronized boolean copyFileFromWeb(){

      try
      {
              URL url = new URL(sourceURL);
              URLConnection urlC = url.openConnection();
              InputStream is = url.openStream();
              System.out.print("Copying resource (type: " +
urlC.getContentType());
              Date date=new Date(urlC.getLastModified());
              System.out.flush();
              FileOutputStream fos=null;
              fos = new FileOutputStream(destinationPath);
              int oneChar, count=0;
              while ((oneChar=is.read()) != -1)
              {
                 fos.write(oneChar);
                 count++;
              }
              is.close();
              fos.close();
              System.out.println(count + " byte(s) copied");
              return true;
      }
      catch (Exception e){
          System.err.println(e.toString());
      }
      return false;

}

In Windows XP it works perfectly, but in Linux it works very slow and
the downloaded file is corrupted! What is wrong?