Java 类com.google.zxing.client.j2se.ImageReader 实例源码

/**
 * Reads image from file and returns its BitMatrix. This function
 * will return null whenever the resource file cannot be found or read.
 *
 * @param resourceName
 * @return
 * @throws IOException if resourceName cannot be opened.
 * @throws NotFoundException
 */
public static BitMatrix readQRImage (String resourceName) throws IOException {
  BitMatrix img = null;

  // Look for resource in classpath
  URL resource = UtilsTest.class.getClassLoader().getResource(resourceName);
  if (resource != null) {
    try {
      // Convert BufferedImage to BitMatrix
      img = toBitMatrix(ImageReader.readImage(resource.toURI()));
    } catch (URISyntaxException e) {
      throw new AssertionError("Malformed URL: " + resource.toString());
    }
  }
  return img;
}

private static void parse() throws IOException, NotFoundException, ChecksumException, FormatException {
    BufferedImage image = ImageReader.readImage(Paths.get("d:/qr.png").toUri());
    LuminanceSource source = new BufferedImageLuminanceSource(image);
    Binarizer bin = new HybridBinarizer(source);
    BinaryBitmap bitmap = new BinaryBitmap(bin);
    Result result = new QRCodeReader().decode(bitmap);
    System.out.println(result.toString());
}

/**
 * 解码 QRCode 图片，解析出其内容
 *
 * @param imageURI QRCode 图片 URI
 * @return 解析后的内容
 * @throws IOException
 */
public static String decodeQRCodeImage(URI imageURI) throws IOException {

    BufferedImage bufferedImage = ImageReader.readImage(imageURI);
    LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    QRCodeReader reader = new QRCodeReader();
    try {
        Result result = reader.decode(bitmap);
        return result.getText();
    } catch (ReaderException e) {
        e.printStackTrace();
    }
    return "";
}

/**
 * 加载二维码图片得到Result对象
 * @param file 二维码文件
 * @return
 * @throws IOException
 */
public static Result loadResult(File file) throws IOException {
    BufferedImage bi = ImageReader.readImage(file);
    return loadResult(bi);
}

/**
 * 加载二维码图片，得到内容
 * @param file 二维码图片文件
 * @return
 * @throws IOException
 */
public static String loadContent(File file) throws IOException {
    BufferedImage bi = ImageReader.readImage(file);
    return loadContent(bi);
}