public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String adname=request.getParameter("adname");
        ApplicationContext App=WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());
        AdDao adDao=(AdDao)App.getBean("adDao");
        Ad ad=adDao.findAd(adname);
        byte images[]=ad.getAdimage();
        
        response.setContentType("image/jpeg");   
        InputStream in=new ByteArrayInputStream(images);
        OutputStream toClient=response.getOutputStream();     
        int len;
        byte[] buf=new byte[1024];   
        while((len =in.read(buf,0,1024))!=-1){   
        toClient.write(buf,0,len);   
        }
        toClient.close();