public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.print( " <script> alert( 'Booking successfully ') </script> ");


        ByteArrayOutputStream out1 = QRCode.from(all).to(ImageType.PNG).stream();
            response.setContentType("image/png");
            response.setContentLength(out1.size());
            
           OutputStream outStream = response.getOutputStream();
            outStream.write(out1.toByteArray());

            outStream.flush();                        
            outStream.close();