ZXing创建和读取二维码示例

文章来源于 ZXing 生成、解析二维码图片的小示例

引入依赖

<dependency>
  <groupId>com.google.zxing</groupId>
  <artifactId>core</artifactId>
  <version>3.3.0</version>
</dependency>
<dependency>
  <groupId>com.google.zxing</groupId>
  <artifactId>javase</artifactId>
  <version>3.3.0</version>
</dependency>

生成二维码图片

• com.google.zxing.MultiFormatWriter生成矩阵BitMatrix
• com.google.zxing.client.j2se.MatrixToImageWriter把BitMatrix变成文件或者字节流

public void encode(String content, String filepath) throws WriterException, IOException {
    int width = 100;
    int height = 100;
    Map<EncodeHintType, Object> encodeHints = new HashMap<EncodeHintType, Object>();
    encodeHints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, encodeHints);
    Path path = FileSystems.getDefault().getPath(filepath);
    MatrixToImageWriter.writeToPath(bitMatrix, "png", path);
}

解析二维码图片

• ImageIO把文件或者流生成BufferedImage
• BufferedImage->com.google.zxing.BinaryBitmap
• com.google.zxing.MultiFormatReader 根据参数来解析 om.google.zxing.BinaryBitmap

public String decode(String filepath) throws IOException, NotFoundException {
    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> decodeHints = new HashMap<DecodeHintType, Object>();
    decodeHints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
    Result result = new MultiFormatReader().decode(bitmap, decodeHints);
    return result.getText();
}

参考

• GitHub 二维码生成