Today, I came across a requirement in my office project where I had to scan some QR codes in Java. For that we used Tasman Barcode Recognition software owned by Accusoft. Then I was interested to see if there are any free and open source softwares for QR Code encoding/decoding. Then I came across ZXing ("zebra crossing") which is a multi-format 1D/2D barcode/qrcode image processing library implemented in Java, with ports to other languages as well.
Below is the example of how a QR Code image can be decoded using ZXing librabry.
Library Downloads:
You'll need two jars core.jar and javase.jar which can be downloaded from here:
- Core: http://repo1.maven.org/maven2/com/google/zxing/core/
- Javase: http://repo1.maven.org/maven2/com/google/zxing/javase/
Steps:
1. Create a Java Project.
- The following is the project I created in eclipse.
2. Create a folder "libs" in the above example and put the jars into the folder.
3. Add the jars to the Project Build Path:
- Right click on the project -> Properties -> Java Build Path -> Libraries Tab -> Add JARs...
4. Create a main class as follows:
package com.qrcode.decoder;
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.Reader;
import com.google.zxing.Result;
import
com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
public class QRCodeDecoder {
public static void main(String[]
args) throws IOException {
File
imageFile = new File("D:\\image.png");
BufferedImage
image = ImageIO.read(imageFile);
try {
LuminanceSource
source = new BufferedImageLuminanceSource(image);
BinaryBitmap
bitmap = new BinaryBitmap(new HybridBinarizer(source));
Reader
reader = new MultiFormatReader();
Result
result = reader.decode(bitmap);
System.out.println("Barcode
text: " + result.getText());
} catch (Exception e) {
e.printStackTrace();
}
}
}
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5. DONE.
Userful Reference:
https://github.com/zxing/zxing/
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