public class QRCodeUtil {

    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸
    private static final int QRCODE_WIDTH = 160;
    private static final int QRCODE_HEIGHT = 161;

    /**
     * 生成二维码图片
     * @param url 扫描二维码跳转地址
     * @return
     * @throws Exception
     */
    public static BufferedImage createImage(String url) throws Exception {
        //使用线程安全的map
        Map<EncodeHintType,Object> hints = new ConcurrentHashMap<>();
        //设置编码的纠错级别
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        //指定生成条形码时要使用的边距（以像素为单位）。
        hints.put(EncodeHintType.MARGIN, 1);
        //生成二维码
        BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        //创建图片
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //将条码放入图片中
        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;
    }
}