In one of my previous articles, we saw how to create QRCode and its SVG equivalent using Zxing Java library. The Zxing library is no longer actively maintained and for this, there is a wrapper around Zxing library called QRGen, which provides much higher level APIs and a builder syntax for generating QR Codes.
In this article, we will see how to use QRGen library to generate QR code images.
Setting Up Maven Dependencies
The QRGen library is hosted on Mulesoft maven repository. You can use the below pom entries to include it in your application dependencies:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 | <dependencies> <dependency> <groupId>com.github.kenglxn.qrgen</groupId> <artifactId>javase</artifactId> <version>2.5.0</version> </dependency></dependencies><repositories> <repository> <id>mulesoft</id> </repository></repositories> |
Fluent Builder API for QR Code generation
The below code snippet shows the generation of QR code image, by default, it gets created in a temp file and we copy it into our project location by using Files.copy()
01 02 03 04 05 06 07 08 09 10 11 12 | File file = QRCode.from("www.google.com").to(ImageType.PNG) .withSize(200, 200) .file();String fileName = "qrgen-qrcode.png";Path path = Paths.get(fileName);if ( Files.exists(path)){ Files.delete(path);}Files.copy(file.toPath(), path); |
Colorful QR Code
Using the fluent API, we can even generate a colorful QR code as shown below:
01 02 03 04 05 06 07 08 09 10 11 | Path colorPath = Paths.get("qrgen-color-qrcode.png");if ( Files.exists(colorPath)){ Files.delete(colorPath);}file = QRCode.from("www.google.com") .withColor(Color.RED.getRGB(), Color.WHITE.getRGB()) .withSize(200, 200) .withErrorCorrection(ErrorCorrectionLevel.Q) .file();Files.copy(file.toPath(), colorPath); |
The complete code can be downloaded from here.
Published on Java Code Geeks with permission by Mohamed Sanaulla, partner at our JCG program. See the original article here: How to Create QRCode Using QRGen in Java Opinions expressed by Java Code Geeks contributors are their own. |
