Java生成二维码

Java生成二维码和解析二维码。

public class QrcodeUtil {
    private static Logger logger = LogManager.getLogger();

    public static String createQrcode(String dir, String content) {
        return createQrcode(dir, content, 300, 300);
    }

    public static String createQrcode(String dir, String content, int width, int height) {
        try {
            String qrcodeFormat = "png";
            HashMap<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);

            File file = new File(dir, UUID.randomUUID().toString() + "." + qrcodeFormat);
            MatrixToImageWriter.writeToPath(bitMatrix, qrcodeFormat, file.toPath());
            return file.getAbsolutePath();
        } catch (Exception e) {
            logger.error("", e);
        }
        return "";
    }

    public static String decodeQr(String filePath) {
        String retStr = "";
        if ("".equalsIgnoreCase(filePath) && filePath.length() == 0) {
            return "图片路径为空!";
        }
        try {
            BufferedImage bufferedImage = ImageIO.read(new FileInputStream(filePath));
            LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap bitmap = new BinaryBitmap(binarizer);
            HashMap<DecodeHintType, Object> hintTypeObjectHashMap = new HashMap<>();
            hintTypeObjectHashMap.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            Result result = new MultiFormatReader().decode(bitmap, hintTypeObjectHashMap);
            retStr = result.getText();
        } catch (Exception e) {
            logger.error("", e);
        }
        return retStr;
    }