<dependency>
    <groupId>net.glxn</groupId>
    <artifactId>qrgen</artifactId>
    <version>1.4</version>
</dependency>

package com.test.qrcode;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import net.glxn.qrgen.QRCode;
import net.glxn.qrgen.image.ImageType;

public class QRCodeService
{
    public static void main(String[] args)
    {
        String qrcodeContent = "https://www.baidu.com/";
        ByteArrayOutputStream out = QRCode.from(qrcodeContent).to(ImageType.PNG).stream();

        try
        {
            FileOutputStream fout = new FileOutputStream(new File("D:/Download/QR_Code.jpg"));
            fout.write(out.toByteArray());
            fout.flush();
            fout.close();
        }
        catch (FileNotFoundException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}