Kotlin - How to read/write QR Code with ZXing

In this tutorial, we’re gonna look at Kotlin examples that read and write QR Code using ZXing.

Contents

I. Dependency
II. Write Data to QR Code
III. Read Data from QR Code

I. Dependency

<groupId>com.google.zxing</groupId>

</dependency>

<groupId>com.google.zxing</groupId>

<artifactId>javase</artifactId>

</dependency>

II. Write Data to QR Code

package com.javasampleapproach.kotlin.qrcode

import java.io.IOException

import java.nio.file.FileSystems

import java.nio.file.Path

import com.google.zxing.BarcodeFormat

import com.google.zxing.WriterException

import com.google.zxing.client.j2se.MatrixToImageWriter

import com.google.zxing.common.BitMatrix

import com.google.zxing.qrcode.QRCodeWriter

@Throws(WriterException::class, IOException::class)

fun main(args: Array<String>?) {

val qrCodeWriter = QRCodeWriter()

val bitMatrix = qrCodeWriter.encode(

"JavaSampleApproach\nJava Technology, Spring Framework",

BarcodeFormat.QR_CODE,

350, 350) // width x height

val path = FileSystems.getDefault().getPath("JSA-QRCode.png")

MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path)

}

A QR Code is generated:
JSA-QRCode

III. Read Data from QR Code

package com.javasampleapproach.kotlin.qrcode

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.NotFoundException

import com.google.zxing.Result

import com.google.zxing.client.j2se.BufferedImageLuminanceSource

import com.google.zxing.common.HybridBinarizer

@Throws(IOException::class, NotFoundException::class)

fun main(args: Array<String>?) {

val QRfile = File("JSA-QRCode.png")

val bufferedImg = ImageIO.read(QRfile)

val source = BufferedImageLuminanceSource(bufferedImg)

val bitmap = BinaryBitmap(HybridBinarizer(source))

val result = MultiFormatReader().decode(bitmap)

System.out.println("Barcode Format: " + result.getBarcodeFormat())

System.out.println("Content: " + result.getText())

}

Check result in Console:

Barcode Format: QR_CODE

Content: JavaSampleApproach

Java Technology, Spring Framework

By grokonez | March 2, 2018.

Kotlin – How to read/write QR Code with ZXing

I. Dependency

II. Write Data to QR Code

III. Read Data from QR Code

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I. Dependency

II. Write Data to QR Code

III. Read Data from QR Code

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