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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