QR Code Generator in JAVA

QR Code Generator in JAVA

What are QR Codes?

The QR Code or Quick Response Code is a two-dimensional barcode that can be read by modern smartphones and specialized QR code scanner devices.

A QR code consists of black squares arranged in a square grid on a white background. There are several versions of QR codes based on their symbol size, layout, encoding and structure.

How to Generate QR code using JAVA ?

So here we will use Google's Zxing library.

1. start eclipse and create meven project and add the following dependencies in your pom.xml file to include zxing in your project -

<dependencies>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.3.0</version>
    </dependency>
</dependencies> 

2. create Class inside src/ and write following code.

package mr.codingboy.java;

import java.util.Scanner;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.BinaryBitmap;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatReader;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.NotFoundException;

import com.google.zxing.Result;

import com.google.zxing.WriterException;

import com.google.zxing.client.j2se.BufferedImageLuminanceSource;

import com.google.zxing.client.j2se.MatrixToImageWriter;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCode {

public static void main(String[] args) throws WriterException, IOException,

NotFoundException {

Scanner sc = new Scanner(System.in);

System.out.print("Enter String : ");

String qrCodeData = sc.nextLine();

String filePath =qrCodeData+".png" ;

String charset = "UTF-8"; // or "ISO-8859-1"

Map<EncodeHintType, ErrorCorrectionLevel> hintMap = new HashMap<EncodeHintType, ErrorCorrectionLevel>();

hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);

createQRCode(qrCodeData, filePath, charset, hintMap, 200, 200);

System.out.println("QR Code image created successfully!");

System.out.println("Data read from QR Code: "

+ readQRCode(filePath, charset, hintMap));

}

public static void createQRCode(String qrCodeData, String filePath,

String charset, Map hintMap, int qrCodeheight, int qrCodewidth)

throws WriterException, IOException {

BitMatrix matrix = new MultiFormatWriter().encode(

new String(qrCodeData.getBytes(charset), charset),

BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight, hintMap);

MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath

.lastIndexOf('.') + 1), new File(filePath));

}

public static String readQRCode(String filePath, String charset, Map hintMap)

throws FileNotFoundException, IOException, NotFoundException {

BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(

new BufferedImageLuminanceSource(

ImageIO.read(new FileInputStream(filePath)))));

Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap,

hintMap);

return qrCodeResult.getText();

}

}

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