How to Generate QR Code using Java

on December 7, 2016

Post Views: 2,210

Generate QR Code using Java

In this example, We will show you about, How to Generate QR Code using Java. The example program has been tested with environment and shared in the post.

Project Structure

Generate QR Code using Java

QRCodeGenerator.java

package com.dineshkrish.utilities;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.EnumMap;
import java.util.Map;
import java.util.Scanner;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 
* @author Dinesh Krishnan
*
*/
public class QRCodeGenerator {
// You can change your path name accordingly
private static final String PATH = "output/";
private static final String FILETYPE = "png";
// Image Width and Height
private static final int IMAGE_SIZE = 250;
// Method to Generate QR Code
public static boolean generate(String text, String fileName) {
if((text != null && !text.isEmpty()) && 
(fileName != null && !fileName.isEmpty())) {
// Defining the File Object with File name (eg: output/test.png)
File file = new File(PATH + fileName + "." + FILETYPE);
try {
Map<EncodeHintType, Object> hintMap = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hintMap.put(EncodeHintType.MARGIN, 1);
hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// Defining QRCodeWriter Object
QRCodeWriter qrcw = new QRCodeWriter();
BitMatrix bitMatrix = qrcw.encode(text, BarcodeFormat.QR_CODE, IMAGE_SIZE, IMAGE_SIZE, hintMap);
int width = bitMatrix.getWidth(); // Width : 250 
int height = bitMatrix.getHeight(); // Height : 250
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
image.createGraphics();
Graphics2D graphics = (Graphics2D) image.getGraphics();
// Setting Background Color
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, width, height);
// Setting Content Color
graphics.setColor(Color.RED);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
if (bitMatrix.get(i, j)) {
graphics.fillRect(i, j, 1, 1);
}
}
}
return ImageIO.write(image, FILETYPE, file);
} catch (WriterException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else {
System.out.println("Invalid Input Found!!!");
System.exit(0);
}
return false;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("What Text you want to Convert to QR Code ? ");
String text = scanner.next();
System.out.println("What File Name you want to keep for QR Code Image ? ");
String fileName = scanner.next();
boolean status = QRCodeGenerator.generate(text, fileName);
if(status) {
System.out.println("The QR Code Generated Successfully.");
} else {
System.out.println("Error During Generating QR Code.");
}
scanner.close();
}
}

Output

—————
What Text you want to Convert to QR Code ?
https://idineshkrishnan.com
What File Name you want to keep for QR Code Image ?
dineshkrish
The QR Code Generated Successfully.