While working on a project for a restaurant, where the user has a QrCode containing his ID and the ID of the reservation then later be scanned at the counter.
This is the sample code I m working with :
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String productId = request.getParameter("productId");
response.setContentType("image/png");
OutputStream outputStream = response.getOutputStream();
outputStream.write(getQRCodeImage(productId, 400, 400));
outputStream.flush();
outputStream.close();
}
private byte[] getQRCodeImage(String text, int width, int height) {
try {
QRCodeWriter qrCodeWriter = new QRCodeWriter();
BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, "png", byteArrayOutputStream);
return byteArrayOutputStream.toByteArray();
} catch (Exception e) {
return null;
}
}
It shows me an Image containing the data I intended to insert. The thing is I want to store those images in a folder that will be kept on the server. PS : Those images will be later scanned by a smartphone application that I'll start on it later.
