Java 类com.google.zxing.oned.EAN13Writer 实例源码

@ResponseBody
@RequestMapping(method = RequestMethod.GET, value = "/{productId}/ean")
public ResponseEntity<?> getProductEAN(@PathVariable String productId) throws WriterException, IOException {
    Product product = repository.findOne(productId);
    if (product == null) {
        return ResponseEntity.notFound().build();
    }
    EAN13Writer ean13Writer = new EAN13Writer();
    BitMatrix matrix = ean13Writer.encode(product.getEan(), BarcodeFormat.EAN_13, 300, 200);
    BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(matrix);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(bufferedImage, "png", baos);
    byte[] imageData = baos.toByteArray();
    ByteArrayResource byteArrayResource = new ByteArrayResource(imageData);
    return ResponseEntity.ok().contentType(MediaType.IMAGE_PNG).body(byteArrayResource);
}

public static InputStream createBarCode(long inputId) {

    try {
        EAN13Writer wt = new EAN13Writer();
        String data = String.format("%012d", inputId);
        int check = getStandardUPCEANChecksum(data);
        data += check;
        BitMatrix bt = wt.encode(data, BarcodeFormat.EAN_13, 200, 50);
        int width = bt.getWidth();
        int height = bt.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        int[] pixels = new int[width * height];
        int index = 0;
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                pixels[index++] = bt.get(x, y) ? Color.BLACK.hashCode() : Color.WHITE.hashCode();
            }
        }
        image.setRGB(0, 0, width, height, pixels, 0, width);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(image, "png", out);
        return new ByteArrayInputStream(out.toByteArray());
    } catch (FormatException | WriterException | IOException e) {
        e.printStackTrace();
       }

    return null;
}

public static BitMatrix generateEAN13(String content, int width, int height) throws WriterException {
    return new EAN13Writer().encode(content, BarcodeFormat.EAN_13, width, height);

}