public class QRcodeUtils {        /**     * 容错率等级 L     */    public static final char CORRECT_L = ‘L‘;    /**     * 容错率等级 M     */    public static final char CORRECT_M = ‘M‘;        /**     * 容错率等级 Q     */    public static final char CORRECT_Q = ‘Q‘;        /**     * 容错率等级 H     */    public static final char CORRECT_H = ‘H‘;        /**     * 旁白占用比率     */    public static final double PADDING_RATIO = 0.05;    /**     * 生成二维码     * @param content 要生成的内容     * @param size    要生成的尺寸     * @param versoin 二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大      * @param ecc 二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)     * @return     * @throws Exception      */    public static BufferedImage encode(String content, int size, int version, char ecc, BufferedImage logo) throws Exception{        BufferedImage image = null;        Qrcode qrcode = new Qrcode();          // 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小          qrcode.setQrcodeErrorCorrect(ecc);          qrcode.setQrcodeEncodeMode(‘B‘);          // 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大          qrcode.setQrcodeVersion(version);          // 获得内容的字节数组，设置编码格式          byte[] contentBytes = content.getBytes("utf-8");          double ratio = 3;//默认放大三倍        int qrcodeSize = 21 + 4 * (version - 1);        if(size > 0){            ratio = (double)size / qrcodeSize;        }        int intRatio = (int)Math.ceil(ratio);                //旁白        int padding = (int)Math.ceil(qrcodeSize * intRatio * PADDING_RATIO);        if(padding < 10){            padding = 10;        }         // 图片尺寸          int imageSize = qrcodeSize * intRatio + padding * 2;        image = new BufferedImage(imageSize, imageSize, BufferedImage.TYPE_INT_RGB);          Graphics2D gs = image.createGraphics();          // 设置背景颜色          gs.setBackground(Color.WHITE);          gs.clearRect(0, 0, imageSize, imageSize);            // 设定图像颜色  BLACK          gs.setColor(Color.BLACK);         // 输出内容  二维码          if (contentBytes.length > 0 && contentBytes.length < 800) {              boolean[][] codeOut = qrcode.calQrcode(contentBytes);              for (int i = 0; i < codeOut.length; i++) {                  for (int j = 0; j < codeOut.length; j++) {                      if (codeOut[j][i]) {                          gs.fillRect(j * intRatio + padding, i * intRatio + padding, intRatio, intRatio);                     }                  }              }          } else {              throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");          }                if(logo != null){            int logoSize = imageSize / 4;            int p = ( imageSize - logoSize ) / 2;            logo = ImageUtils.setRadius(logo);            gs.drawImage(logo, p,  p, logoSize, logoSize, null);        }                gs.dispose();        image.flush();                if(intRatio > ratio){            image = resize(image, (int)Math.ceil(ratio * imageSize / intRatio ));        }        return image;    }        /**     * 生成二维码     * @param content     * @param size     * @param version     * @param ecc     * @return     * @throws Exception     */    public static BufferedImage encode(String content, int size, int version, char ecc) throws Exception{        return encode(content, size, version, ecc, null);    }        /**     * 生成二维码     * @param content     * @param size     * @return     * @throws Exception      */    public static BufferedImage encode(String content, int size) throws Exception{        return encode(content, size, 9, CORRECT_Q);    }        /**     * 生成二维码     * @param content     * @param size     * @param version     * @return     */    public static BufferedImage encode(String content, int size, int version) throws Exception{        return encode(content, size, version, CORRECT_Q);    }        /**     * 生成二维码     * @param content     * @param size     * @param logo     * @return     */    public static BufferedImage encode(String content, int size, BufferedImage logo) throws Exception{        return encode(content, size, 9, CORRECT_Q, logo);    }        /**     * 生成二维码     * @param content     * @param size     * @param ecc     * @return     */    public static BufferedImage encode(String content, int size, char ecc) throws Exception{        return encode(content, size, 9, ecc);    }        /**     * 生成二维码     * @param content     * @return     */    public static BufferedImage encode(String content) throws Exception{        return encode(content, 0, 9, CORRECT_Q);    }        /**     * 解析二维码     * @throws UnsupportedEncodingException      * @throws DecodingFailedException      */    public static String decode(BufferedImage bufferedImage) throws DecodingFailedException, UnsupportedEncodingException{         QRCodeDecoder decoder = new QRCodeDecoder();           return new String(decoder.decode(new MyQRCodeImage(bufferedImage)), "utf-8");       }        /**     * 图片缩放     */    private static BufferedImage resize(BufferedImage image, int size){        BufferedImage bufferedImage = new BufferedImage(size, size, BufferedImage.TYPE_INT_RGB);          Graphics2D gs = bufferedImage.createGraphics();          gs.setBackground(Color.WHITE);          gs.clearRect(0, 0, size, size);          gs.setColor(Color.BLACK);        gs.fillRect(0, 0, size, size);        gs.drawImage(image, 0, 0, size, size, null);          gs.dispose();          image.flush();        return bufferedImage;    }    }