Java: Read QR code

Below snippet is used to read the information from QR code.

BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(ImageIO.read(new FileInputStream(filePath)))));  
Result rslt = new MultiFormatReader().decode(binaryBitmap);  
String info = result.getText();

 

Find the below working application.

 

QRCodeUtil.java

package com.sample.app.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Paths;
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.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 QRCodeUtil {

	public static boolean generateQRCode(String message, String filePath, Charset encodingFormat, int imageHeight,
			int imageWidth) {

		try {
			Map<EncodeHintType, ErrorCorrectionLevel> hashMap = new HashMap<EncodeHintType, ErrorCorrectionLevel>();
			hashMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

			BitMatrix bitMatrix = new MultiFormatWriter().encode(new String(message.getBytes(encodingFormat)),
					BarcodeFormat.QR_CODE, imageHeight, imageWidth);

			String fileFormat = filePath.substring(filePath.lastIndexOf('.') + 1);
			MatrixToImageWriter.writeToPath(bitMatrix, fileFormat, Paths.get(filePath));
			return true;

		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}

	}

	public static String getInfoFromQRCode(String filePath, Charset encodingFormat)
			throws FileNotFoundException, IOException, NotFoundException {
		BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(ImageIO.read(new FileInputStream(filePath)))));  
		Result result = new MultiFormatReader().decode(binaryBitmap);  
		return result.getText();  
	}
}

 

QrCodeReadDemo.java

package com.sample.app;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

import com.google.zxing.NotFoundException;
import com.sample.app.util.QRCodeUtil;

public class QrCodeReadDemo {
	public static void main(String args[]) throws FileNotFoundException, NotFoundException, IOException {
		String filePath = "/Users/Shared/secret.png";

		boolean isQRCodeGenerated = QRCodeUtil.generateQRCode("Transfer 1000 from account A to Account B", filePath,
				StandardCharsets.UTF_8, 250, 250);

		if (isQRCodeGenerated) {
			System.out.println("QR code generated successfully");
		} else {
			System.out.println("QR code generation failed");
		}
		
		String message = QRCodeUtil.getInfoFromQRCode(filePath, StandardCharsets.UTF_8);
		
		System.out.println(message);
		
	}
}

 

Output

QR code generated successfully
Transfer 1000 from account A to Account B

 

 

 

 

 

 

Previous                                                    Next                                                    Home