依据前端传递的数字等生成二维码图片

前端：
传入对应得参数

后端：
para–前端传入的参数

public String createQrCode(Map para) {
    
    
        if (para == null || para.get("url") == null || StringUtils.isBlank(para.get("url").toString())) {
    
    
            throw new AppException("请选择操作项");
        }

        try {
    
    
            BufferedImage image = QrcodeUtil.createImage(para.get("url").toString(), 350, 350);
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            ImageIO.write(image, "jpg", stream);
            byte[] content = stream.toByteArray();
            Base64Encoder encoder = new Base64Encoder();
            String imgSrc = encoder.encode(content);
            return "data:image/jpeg;base64," + imgSrc;
        } catch (Exception e) {
    
    
            log.error("生成二维码失败!");
            throw new AppException("二维码生成失败!");
        }
    }

---

工具类

 /**
     * 二维码图片的生成
     * @param content			链接
     * @param qrcode_width		二维码宽
     * @param qrcode_height		二维码高
     * @return
     * @throws Exception
     */
    public static BufferedImage createImage(String content, int qrcode_width, int qrcode_height) throws Exception {
    
    
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
                BarcodeFormat.QR_CODE, qrcode_width, qrcode_height, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
    
    
            for (int y = 0; y < height; y++)
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
                        : 0xFFFFFFFF);
        }
        return image;
    }