Qr Code Library Java Free Download

Php Qr Code Library
Android Qr Code Library

Booked a movie ticket recently and got the ticket in the form of a QR Code?

Download qrgen-1.2.jar. Qrgen/qrgen-1.2.jar.zip( 4 k) The download jar file contains the following class files or Java source files. META-INF/MANIFEST.MF META-INF. Oct 07, 2019 ZXing ('zebra crossing') is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. Supported Formats 1D product. Project Summary. This project develops and distributes QR Code decode/encode library under GPL v2. The project goal is Utilize QR Code embedded information for programmable devices all over the world.QR Code is the industrial standard, JIS-X-0510 and ISO/IEC18004.

Sent money to your friend’s mobile wallet using his QR Code?

Well, If you’re not living in Antarctica or Mount Everest, then chances are that you might have heard about or used QR Codes in your life.

If you wanted to know how QR Codes work and how to generate one for your next exciting project, then this blog post is for you.

What are QR Codes?

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

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

Following is an image of a typical QR Code (I’ve encoded something in this QR Code image. Scan it from your smartphone to check what’s inside :-) -

QR Codes can be used to encode various types of data like - simple text, urls, phone numbers, sms, geolocation, email address etc.

In the next section, we’ll learn how to encode such data and generate the QR Code in Java.

How to generate QR Code in Java?

We’ll use Google’s Zxing library to generate QR codes for our application.

Zxing, pronounced as Zebra Crossing, is an open source, multi-format 1D/2D barcode image processing library implemented in java.

1. Add Zxing dependencies

If you use maven, then add the following dependencies in your pom.xml file to include zxing in your project -

Android users, or other gradle users can add the following to their build.gradle file -

If you are not using any build system then just download the following zxing jars hosted on Maven release repository and add them in the classpath -

2. Program to generate QR Code

In the following program, I’ve written a method called generateQRCodeImage which takes the text to be encoded, the width and height of the QR Code, and the file system’s path where QR Code will be saved.

The function generates and saves the QR Code in the specified path.

The above program will generate a QR Code with text - “This is my first QR Code” and save it in the specified location. Here is the generated QR Code -

The above generateQRCode method writes the QRCode image into the specified location. If you don’t want to save the QRCode and want to return it from the function as a byte array, then you can use MatrixToImageWriter.writeToStream() method provided by zxing library -

The above method is very useful -

If you’re developing a web application and want to return the QR Code image as a response to an http request. You can return the byte array in the body of your http response.
If you’re developing an android application and want to display the QR Code on your activity screen. You can convert the byte array into a BitMap and display the image in an ImageView.

Securing your QR Codes

Php Qr Code Library

The text that is encoded using QR Code can be read and interpreted by any smart phone and qr code scanner devices. But, What if you don’t want everyone to read what is encoded in the QR Code?

Well, QR Code itself does not provide any security. Here is what you can do instead -

Before generating QR code with any text, encrypt the text using any cryptographic algorithm with a secret that only your application has access to.
Generate QR Code with the encrypted text.

Now, even if someone scans your QR Code, they will get the encrypted text which they can’t decrypt unless they know the secret which was used to encrypt it.

But when you scan the QR Code in your application, you can decrypt the text using the secret and get the actual data stored in the QR Code.

Conclusion

In this post, we learned how to generate QR codes in java using google’s zxing library. In the next post, we’ll learn how to read QR code images in Java.

You can find all the code samples in my github repository.

Thank you for reading. Please ask any doubts in the comment section below.

Introduction

This project aims to be the best, clearest QR Code generator library in multiple languages. The primary goals are flexible options and absolute correctness. Secondary goals are compact implementation size and good documentation comments.

Home page with live JavaScript demo, extensive descriptions, and competitor comparisons: https://www.nayuki.io/page/qr-code-generator-library

Android Qr Code Library

Features

Core features:

Available in 6 programming languages, all with nearly equal functionality: Java, TypeScript/JavaScript, Python, Rust, C++, C
Significantly shorter code but more documentation comments compared to competing libraries
Supports encoding all 40 versions (sizes) and all 4 error correction levels, as per the QR Code Model 2 standard
Output formats: Raw modules/pixels of the QR symbol (all languages), SVG XML string (all languages except C), BufferedImage raster bitmap (Java only), HTML5 canvas (TypeScript/JavaScript only)
Detects finder-like penalty patterns more accurately than other implementations
Encodes numeric and special-alphanumeric text in less space than general text
Open source code under the permissive MIT License

Manual parameters:

User can specify minimum and maximum version numbers allowed, then library will automatically choose smallest version in the range that fits the data
User can specify mask pattern manually, otherwise library will automatically evaluate all 8 masks and select the optimal one
User can specify absolute error correction level, or allow the library to boost it if it doesn't increase the version number
User can create a list of data segments manually and add ECI segments

Optional advanced features (Java only):

Encodes Japanese Unicode text in kanji mode to save a lot of space compared to UTF-8 bytes
Computes optimal segment mode switching for text with mixed numeric/alphanumeric/general/kanji parts

More information about QR Code technology and this library's design can be found on the project home page.

Examples

Java language:

TypeScript/JavaScript languages:

Python language:

C++ language:

C language:

Rust language:

License

Permission is hereby granted, free of charge, to any person obtaining a copy ofthis software and associated documentation files (the 'Software'), to deal inthe Software without restriction, including without limitation the rights touse, copy, modify, merge, publish, distribute, sublicense, and/or sell copies ofthe Software, and to permit persons to whom the Software is furnished to do so,subject to the following conditions:

The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.
The Software is provided 'as is', without warranty of any kind, express orimplied, including but not limited to the warranties of merchantability,fitness for a particular purpose and noninfringement. In no event shall theauthors or copyright holders be liable for any claim, damages or otherliability, whether in an action of contract, tort or otherwise, arising from,out of or in connection with the Software or the use or other dealings in theSoftware.