Download File GWT

Hi all.. I need to know how to use DownloadServlet.. I tried to implement it but i don't understand how to continue the code.. here my implementation

  public class DownloadServlet extends HttpServlet{      protected void doGet( HttpServletRequest req, HttpServletResponse resp ) throws ServletException, IOException          {              String fileName = req.getParameter( "fileInfo1" );                int BUFFER = 1024 * 100;              resp.setContentType( "application/octet-stream" );              resp.setHeader( "Content-Disposition:", "attachment;filename=" + "\"" + fileName + "\"" );              ServletOutputStream outputStream = resp.getOutputStream();              resp.setContentLength( Long.valueOf( getfile(fileName).length() ).intValue() );              resp.setBufferSize( BUFFER );              //Your IO code goes here to create a file and set to outputStream//            }      }

what do i need now??.. Thanks in advance

Davide

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