Wechat payment QR code generation

The QR code of wechat payment is based on payment related information , Go to wechat server to apply for payment QR code , Then display the QR code content on the website , In this way, the user can pay for the order .

1、 Generate pictures

public static BufferedImage drawImage(String content, String imgPath, boolean needCompress) throws Exception {
    
		Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
		hints.put(EncodeHintType.MARGIN, 1);
		BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
				hints);
		bitMatrix = deleteWhite(bitMatrix);
		int width = bitMatrix.getWidth();
		int height = bitMatrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
    
			for (int y = 0; y < height; y++) {
    
				image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
			}
		}
			return image;
	}

2、 Insert a picture

private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
    
		File file = new File(imgPath);
		if (!file.exists()) {
    
			System.err.println("" + imgPath + "  The file does not exist ！");
			return;
		}
		Image src = ImageIO.read(new File(imgPath));
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) {
     //  Compress LOGO
			if (width > WIDTH) {
    
				width = WIDTH;
			}
			if (height > HEIGHT) {
    
				height = HEIGHT;
			}
			Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
			BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = tag.getGraphics();
			g.drawImage(image, 0, 0, null); //  Draw a reduced image 
			g.dispose();
			src = image;
		}
		//  Insert LOGO
		Graphics2D graph = source.createGraphics();
		int x = (QRCODE_SIZE - width) / 2;
		int y = (QRCODE_SIZE - height) / 2;
		graph.drawImage(src, x, y, width, height, null);
		Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
		graph.setStroke(new BasicStroke(3f));
		graph.draw(shape);
		graph.dispose();
	}

3、 Convert the picture to Base64

 try(ByteArrayOutputStream outputStream = new ByteArrayOutputStream();) {
    
    BufferedImage image = QRCodeUtil.createImage(codeUrl , null, false);
     ImageIO.write(image, "jpg", outputStream);
      String base64Str = "data:image/jpeg;base64,"+new BASE64Encoder().encode(outputStream.toByteArray());
   } catch (Exception e) {
    
log.error(e.getMessage(),e);
 }