Generate QR Code in Quarkus Application

Hello everyone, today we will learn how to generate the QR Code in the Quarkus application using zxing.

Technology Used:

  • JDK 11
  • Quarkus 2.2.3.Final
  • zxing library 3.3.0
  • Maven 3.8.1

Project Directory:

Dependency management:

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<groupId>org.knf.dev.demo</groupId>
<artifactId>quarku-qr-code</artifactId>
<version>1.0.0-SNAPSHOT</version>
<properties>
<compiler-plugin.version>3.8.1</compiler-plugin.version>
<maven.compiler.parameters>true</maven.compiler.parameters>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
<quarkus.platform.group-id>io.quarkus.platform</quarkus.platform.group-id>
<quarkus.platform.version>2.3.0.Final</quarkus.platform.version>
<surefire-plugin.version>3.0.0-M5</surefire-plugin.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>${quarkus.platform.group-id}</groupId>
<artifactId>${quarkus.platform.artifact-id}</artifactId>
<version>${quarkus.platform.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-arc</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-resteasy</artifactId>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-junit5</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.rest-assured</groupId>
<artifactId>rest-assured</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>${quarkus.platform.group-id}</groupId>
<artifactId>quarkus-maven-plugin</artifactId>
<version>${quarkus.platform.version}</version>
<extensions>true</extensions>
<executions>
<execution>
<goals>
<goal>build</goal>
<goal>generate-code</goal>
<goal>generate-code-tests</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>${compiler-plugin.version}</version>
<configuration>
<parameters>${maven.compiler.parameters}</parameters>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire-plugin.version}</version>
<configuration>
<systemPropertyVariables>
<java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
<maven.home>${maven.home}</maven.home>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>native</id>
<activation>
<property>
<name>native</name>
</property>
</activation>
<build>
<plugins>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>${surefire-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
<configuration>
<systemPropertyVariables>
<native.image.path>${project.build.directory}/${project.build.finalName}-runner</native.image.path>
<java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
<maven.home>${maven.home}</maven.home>
</systemPropertyVariables>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<properties>
<quarkus.package.type>native</quarkus.package.type>
</properties>
</profile>
</profiles>
</project>

QRCodeService

package org.knf.dev.demo.qrcodeservice;

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;
import javax.enterprise.context.ApplicationScoped;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

@ApplicationScoped
public class QRCodeService {

public static byte[] getQRCode(String text, int width, int height)
throws WriterException, IOException {
String imageFormat = "png"; // could be "gif", "tiff", "jpeg"
QRCodeWriter qrCodeWriter = new QRCodeWriter();
BitMatrix bitMatrix = qrCodeWriter.
encode(text, BarcodeFormat.QR_CODE, width, height);
ByteArrayOutputStream pngOutputStream =
new ByteArrayOutputStream();
MatrixToImageWriter.
writeToStream(bitMatrix, imageFormat, pngOutputStream);
byte[] pngData = pngOutputStream.toByteArray();
return pngData;
}
}

QRCodeResource

package org.knf.dev.demo.resource;

import com.google.zxing.WriterException;
import org.knf.dev.demo.qrcodeservice.QRCodeService;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Response;
import java.io.ByteArrayInputStream;
import java.io.IOException;

@Path("")
public class QRCodeResource {
private final String text = "www.knowledgefactory.net";
private final int width = 400;
private final int height = 400;
@Inject
QRCodeService qRCodeService;

@Path("/generateQRCode")
@GET
@Produces("image/png")
public Response generateQRCode() throws
IOException, WriterException {

// uncomment line below to send non-streamed
// return Response.ok(QRCodeService.
// getQRCode(text, width, height)).build();

// to send streamed
return Response.
ok(new ByteArrayInputStream(QRCodeService.
getQRCode(text, width, height))).
build();
}
}

Verify the API

Build application  jar file: mvn clean package


Start application: java -jar quarkus-run.jar


Scan the QR Code using any QR Code Scanner


Download the source code: 

More Quarkus Related topics,

Kotlin + Quarkus

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