For Explanation watch video
How to generate QR Code Using Spring Boot - YouTube
How to generate QR Code Using Spring Boot*********************************for code click here : https://medium.com/@idiotN/how-to-generate-qr-code-using-spri...
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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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