Java 二维码生成

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.SneakyThrows;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.Hashtable;

public class QRCodeUtil {


    /**
     * 字符集
     */
    private static final String CHARSET = "utf-8";

    /**
     * 生成二维码 BufferedImage
     * @param content 内容
     * @param width 宽
     * @param height 搞
     * @return BufferedImage
     * @throws WriterException  WriterException
     */
    public static BufferedImage genQRCode(String content,int width,int height) throws WriterException {

        Hashtable hints = new Hashtable();
        //纠错能力 设置为M
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        //设置字符集
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        //边缘
        hints.put(EncodeHintType.MARGIN, 5);

        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);
        return MatrixToImageWriter.toBufferedImage(bitMatrix);
    }

    /**
     *  生成Base64  PNG字符串
     *  例如： data:image/Png;base64,123123123123123132
     * @param content 内容
     * @param width 宽
     * @param height 搞
     * @return String 字符串
     * @throws WriterException WriterException
     * @throws IOException IOException
     */
    @SneakyThrows
    public static String genQRBase64(String content, int width, int height)  {
        try {
            BufferedImage bufferedImage = genQRCode(content, width,height);

            String imageString = encodeImageToString(bufferedImage, ImageTypeEnum.PNG.getName());

            return "data:image/Png;base64," + imageString;
        }catch (Exception ex){

            throw new Exception(XdfnisBizCodeEnum.GEN_QR_CODE_ERROR.getMessage());

        }

    }

    /**
     * Convert BufferedImage to Base64
     * @param image  BufferedImage
     * @param formatName 图片类型， ImageTypeEnum
     * @return String Base64 字符串
     * @throws IOException 异常
     */
    public static String encodeImageToString(BufferedImage image, String formatName) throws IOException {
        String imageString ;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();


        ImageIO.write(image, formatName, bos);
        byte[] imageBytes = bos.toByteArray();

        Base64.Encoder encoder = Base64.getEncoder();
        imageString = encoder.encodeToString(imageBytes);

        bos.close();

        return imageString;
    }