CODE EXAMPLE FOR JAVA

qr code spring boot

package dev.simplesolution.generateqr.service.impl;

import com.google.zxing.BarcodeFormat;
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 dev.simplesolution.generateqr.service.QRCodeService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

@Service
public class QRCodeServiceImpl implements QRCodeService {

    private Logger logger = LoggerFactory.getLogger(QRCodeServiceImpl.class);

    @Override
    public byte[] generateQRCode(String qrContent, int width, int height) {
        try {
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            BitMatrix bitMatrix = qrCodeWriter.encode(qrContent, BarcodeFormat.QR_CODE, width, height);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            MatrixToImageWriter.writeToStream(bitMatrix, "PNG", byteArrayOutputStream);
            return byteArrayOutputStream.toByteArray();
        } catch (WriterException e) {
            logger.error(e.getMessage(), e);
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }
}