使用 Google 的 zxing 庫實現二維碼的生成與識別

maven jar包依賴

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.4.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.4.0</version>
</dependency>

 

生成二維碼

public static void encode(File file, String content, String format) throws IOException, WriterException {
    // 設置生成的二維碼的高度和寬度
    int height = 500, width = 500;
    // 編碼時的額外參數
    Map hints = Maps.newHashMap();
    // 編碼
    hints.put(EncodeHintType.CHARACTER_SET, StandardCharsets.UTF_8.displayName());
    // 容錯等級
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
    // 邊框
    hints.put(EncodeHintType.MARGIN, 2);
    // 編碼的方式（二維碼、條形碼...）
    BarcodeFormat qrCode = BarcodeFormat.QR_CODE;

    BitMatrix bitMatrix = new MultiFormatWriter().encode(content, qrCode, width, height, hints);
    MatrixToImageWriter.writeToPath(bitMatrix, format, file.toPath());
}

 

生成帶logo 的二維碼

public static void encode(File file, String content, File logoImg) throws IOException, WriterException {
    String fileName = file.getName();
    String fileType = fileName.substring(fileName.lastIndexOf(".") + 1);
    encode(file, content, fileType);
    BufferedImage logo = ImageIO.read(file);
    overlapImage(logo, fileType, file, logoImg);
}

 

識別二維碼

public static String decode(File file) throws IOException, NotFoundException {
    MultiFormatReader formatReader = new MultiFormatReader();
    BufferedImage image = ImageIO.read(file);
    BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
    Map hints = Maps.newHashMap();
    hints.put(EncodeHintType.CHARACTER_SET, StandardCharsets.UTF_8.displayName());
    Result result = formatReader.decode(binaryBitmap, hints);
    // 種類： result.getBarcodeFormat()
    return result.getText();
}

 

源碼

• QrCodeUtils GitHub 源碼地址