saving xml file into local disk using jsp

Hi Techies,
           I am creating the xml file from jsp and  generation of xml is working fine for me.
       Now the  query is    How can I point out the location of local machine??
   Here is my code

String locationAndBackupFileName =request.getParameter("locationAndNameOfBackupFile");
      System.out.println("Location"+locationAndBackupFileName);
StringWriter  stringOut = new StringWriter();        
XMLSerializer   serial = new XMLSerializer(stringOut, new OutputFormat("xml", "UTF-8", true));
response.setContentType("application/xml");
 
response.setHeader("Content-Disposition","attachement; filename="+locationAndBackupFileName);
serial.setOutputCharStream(new FileWriter(locationAndBackupFileName));

serial.serialize(document.getDocumentElement());

when I xcute my code I am getting download dialog box, with save option.
    But after downloading no data is available.
   Can u guys help me to fix this problem

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