For Explanation watch video
to generate QR we will use ZXing
ZXing (“Zebra Crossing”) barcode scanning library for Java, Android
QR code is used to store large amounts of data in a limited space
Directoy Structure
step 1 : create project with web dependency
Add below dependencies to use ZXing
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.5.2</version>
</dependency>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.2.1</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>SpringBootQrCode</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SpringBootQrCode</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
SpringBootQrCodeApplication
we need to manually register a message converter for BufferedImage HTTP Responses
package com.example.demo;
import java.awt.image.BufferedImage;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.BufferedImageHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
@SpringBootApplication
public class SpringBootQrCodeApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootQrCodeApplication.class, args);
}
@Bean
public HttpMessageConverter<BufferedImage> createImageHttpMessageConverter() {
return new BufferedImageHttpMessageConverter();
}
}
QrCodeController
package com.example.demo.controller;
import java.awt.image.BufferedImage;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
@RestController
@RequestMapping("/qr")
public class QrCodeController {
@GetMapping(value = "/{barcode}", produces = MediaType.IMAGE_PNG_VALUE)
public ResponseEntity<BufferedImage> barbecueEAN13Barcode(@PathVariable("barcode") String barcode)
throws Exception {
QRCodeWriter barcodeWriter = new QRCodeWriter();
BitMatrix bitMatrix =
barcodeWriter.encode(barcode, BarcodeFormat.QR_CODE, 200, 200);
return new ResponseEntity<>(MatrixToImageWriter.toBufferedImage(bitMatrix),HttpStatus.OK);
}
}
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