Java – Read QR Code using zxing | Code Factory

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We’ll use Google’s zxing library to read QR code images.

Please make sure that following zxing dependencies are added in your pom.xml file

<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>

QRCodeReader.java

package com.example.java.programming;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

/**
 * @author code.factory
 *
 */
public class QRCodeReader {

	private static final String IMAGE_PATH = "QR.png";

	public static void main(String... args) {
		try {
			File file = new File(IMAGE_PATH);
			String str = readQRCode(file);
			if (str == null) {
				System.out.println("No QR Code found in the Image.");
			} else {
				System.out.println("Decoded = " + str);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private static String readQRCode(File file) throws IOException {
		BufferedImage bufferedImage = ImageIO.read(file);
		LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

		try {
			Result result = new MultiFormatReader().decode(bitmap);
			return result.getText();
		} catch (NotFoundException e) {
			System.out.println("There is no QR code in the Image.");
			return null;
		}
	}
}

Output :

Decoded = Code Factory