Java – Generate QR Code using zxing | Code Factory

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We’ll use Google’s Zxing library to generate QR codes for our application.

Zxing, pronounced as Zebra Crossing, is an open source, multi-format 1D/2D barcode image processing library implemented in java.

Add below dependencies in pom.xml.

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.4.0</version>
</dependency>

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>javase</artifactId>
	<version>3.4.0</version>
</dependency>

QRCodeGenerator.java

package com.example.java.programming;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;

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;

/**
 * @author code.factory
 *
 */
public class QRCodeGenerator {
	
	private static final String IMAGE_PATH = "QR.png";
	private static final String IMAGE_FORMAT = "PNG";
	
	public static void main(String... args) {
		try {
			generateQR("Code Factory", 400, 400, IMAGE_PATH);
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	private static void generateQR(String msg, int width, int height, String imagePath) throws WriterException, IOException {
		QRCodeWriter writer = new QRCodeWriter();
		BitMatrix matrix = writer.encode(msg, BarcodeFormat.QR_CODE, width, height);
		Path path = FileSystems.getDefault().getPath(imagePath);
		MatrixToImageWriter.writeToPath(matrix, IMAGE_FORMAT, path);
		
		/*If you want to return byte array of QR code then use below code*/
		/*ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
		MatrixToImageWriter.writeToStream(matrix, IMAGE_FORMAT, pngOutputStream);
	    byte[] data = pngOutputStream.toByteArray(); 
	    return data;*/
	}
}