spring boot 通过zxing生成二维码

Spring Boot是一个基于Spring框架的快速开发、便捷部署的微服务框架。而ZXing是一个功能强大的开源库，用于生成和解析二维码。在Spring Boot应用中，您可以整合ZXing库来方便地生成二维码。

接下来，创建一个Spring Boot服务，并编写一个控制器类来生成二维码。以下是一个简单的例子：

@RestController
public class QrController {

    @Resource
    private CouponApi couponApi;


    @GetMapping("/qr")
    public ResponseEntity<byte[]> getImageData(CouponRequest request) throws IOException, WriterException {

        ResponseEntity<byte[]> result=new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);

        ResponseObject<CouponResponse> res = couponApi.view(request);
        if (res.getCode()!=200){
            return result;
        }

        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.MARGIN,1);
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        String data=String.format("http://www.niubaite.com/check?id=%d&code=%s",res.getData().getId(),res.getData().getCouponCode());
        BitMatrix bitMatrix = qrCodeWriter.encode(data, BarcodeFormat.QR_CODE, 300, 300, hints);

        BufferedImage bufferedImage = new BufferedImage(bitMatrix.getWidth(), bitMatrix.getHeight(), BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < bitMatrix.getWidth(); x++) {
            for (int y = 0; y < bitMatrix.getHeight(); y++) {
                bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        ByteArrayOutputStream outputStream=new ByteArrayOutputStream();
        ImageIO.write(bufferedImage, "png", outputStream);
        byte[] imageData =outputStream.toByteArray();

        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Type", "image/png"); // 设置内容类型为图像

        return new ResponseEntity<>(imageData, headers, HttpStatus.OK);
    }

}