QR code 儲值問題解决办法

 String qrtext = request.getParameter("doctor");            String qrtext2 = request.getParameter("subject");                 ByteArrayOutputStream out1 = QRCode.from(qrtext).to(                    ImageType.PNG).stream();            ByteArrayOutputStream out2 = QRCode.from(qrtext2).to(                    ImageType.PNG).stream();            response.setContentType("image/png");            response.setContentLength(out1.size());            //response.setContentLength(out2.size());            OutputStream outStream = response.getOutputStream();            outStream.write(out1.toByteArray());            //outStream.write(out2.toByteArray());            outStream.flush();            outStream.close();