How to generate QR Code in Java

By Atul Rai | Last Updated: October 13, 2020 Previous       Next

QRGen library provides an API to generate the QR Code in a Java application. It is built on the top of ZXing. Add the following dependency to your project’s pom.xml file.

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>
 
<dependencies>
    <dependency>
        <groupId>com.github.kenglxn.qrgen</groupId>
        <artifactId>javase</artifactId>
        <version>2.6.0</version>
    </dependency>
</dependencies>

P.S. The QRGen library is no longer deployed to Maven Central, but it’s available on jitpack.io.

The sample of QR Code generated through QRGen library:

package org.websparrow;

import net.glxn.qrgen.javase.QRCode;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

public class QRCodeDemo {

  private static final String BARCODE_TEXT = "https://websparrow.org";

  public static void main(String[] args) {

    try (ByteArrayOutputStream bos = QRCode.from(BARCODE_TEXT).withSize(250, 250).stream(); ) {

      ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());

      ImageIO.write(ImageIO.read(bis), "PNG", new File("QRCode.png"));

      System.out.println("QR Code successfully generated");
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

References

1. QRGen- Github
2. QRGen- JitPack