将二维码和背景图片拼装成新的分享图片

/**
 * @ClassName: QrCodeServiceImpl
 * @Description:操作图片
 * @Author guoh
 * @Date 2018/8/9 13:29
 */
@Service
public class QrCodeServiceImpl implements QrCodeService {

    private Logger logger = LoggerFactory.getLogger(QrCodeServiceImpl.class);

    public static final Integer QR_CODE_WIDTH = 204; //二维码宽度
    public static final Integer QR_CODE_HEIGHT = 204;// 二维码高度
    public static final Integer OR_YELLOW_COLOR = 0xFF6600;// 黄色
    public static final Integer OR_WHITE_COLOR = 0xFFFFFFFF;// 白色


    /**
     * 将二维码和背景图片拼装成新的分享图片
     * @param shareContent  生成二维码内容
     * @param bgPicturePath 背景图片地址
     * @return base64 String 的图片
     */
    @Override
    public String createBase64Image(String shareContent, String bgPicturePath) {
        try {
            logger.info("begin to create base64 image shareContent:{}",shareContent);

            // 1.1 生成二维码图片
            BufferedImage qrCodeImage = createQrImage(shareContent, QR_CODE_WIDTH, QR_CODE_HEIGHT);

            // 1.2 读取并生成背景图片
            Image bgImage = ImageIO.read(new FileInputStream(bgPicturePath));
            BufferedImage bgPicture = new BufferedImage(bgImage.getWidth(null), bgImage.getHeight(null), BufferedImage.TYPE_INT_RGB);

            // 1.3 将二维码拼接背景图片
            Graphics2D g = bgPicture.createGraphics();
            g.drawImage(bgImage, 0, 0, null);
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 1));
            int starX = bgImage.getWidth(null)*275/750;// 二维码距背景图片X轴距离
            int startY = bgImage.getHeight(null)*990/1405;// 二维码距背景图片Y轴距离
            g.drawImage(qrCodeImage, starX, startY, qrCodeImage.getWidth(null), qrCodeImage.getHeight(null), null);
            g.dispose();

            // 1.4 将合成的图片转为base64String
            ByteArrayOutputStream compositeImageByte = new ByteArrayOutputStream();
            ImageIO.write(bgPicture, "png", compositeImageByte);
            String pngBase64 =  new BASE64Encoder().encodeBuffer(compositeImageByte.toByteArray()).trim();//转换成base64串
            pngBase64 = "data:image/png;base64," + pngBase64.replaceAll("\n", "").replaceAll("\r", "");//删除 \r\n

            logger.info("create base64 image success");
            return pngBase64;
        } catch (Exception e) {
            logger.info("create base64 image error",e);
            return null;
        }
    }

    /**
     * 生成二维码图片
     * @param shareContent 生成二维码分享内容
     * @param qrCodeWidth 维码宽度
     * @param qrCodeHeight 二维码高度
     * @return 二维码图片【ImageIO.write方法可将图片保存到本地】
     */
    @Override
    public BufferedImage createQrImage(String shareContent, int qrCodeWidth, int qrCodeHeight) {
        logger.info("begin to create qrImage shareContent:{}",shareContent);

        // 用于设置QR二维码参数
        Hashtable hints = new Hashtable<>();
        // 设置QR二维码的纠错级别——这里选择最高H级别
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 设置编码方式
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 使用EncodeHintType.MARGIN设置二维码空白区域大小
        hints.put(EncodeHintType.MARGIN, 1);
        // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度
        BitMatrix bitMatrix;
        try {
            bitMatrix = new MultiFormatWriter().encode(shareContent, BarcodeFormat.QR_CODE, qrCodeWidth, qrCodeHeight, hints);
        } catch (WriterException e) {
            logger.info("create qrImage error",e);
            return null;
        }
        // 创建一个不带透明色的BufferedImage对象
        BufferedImage image = new BufferedImage(bitMatrix.getWidth(), bitMatrix.getHeight(), BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < bitMatrix.getWidth(); x++) {
            for (int y = 0; y < bitMatrix.getHeight(); y++) {
                // 开始利用二维码数据，分别设为黄0xFF6600和白0xFFFFFFFF两色
                image.setRGB(x, y, bitMatrix.get(x, y) ? OR_YELLOW_COLOR : OR_WHITE_COLOR);
            }
        }
        logger.info("create qrImage success");
        return image;
    }
}