File Upload, Download, And Delete - Azure Blob Storage + Spring Boot Example

In this section, you will learn how to create a storage account on Microsoft Azure and create a simple spring boot application to perform different file operations such as upload, download, and delete files from the Azure blob storage.


A little bit of Background

Azure Blob Storage

Azure Blob storage is Microsoft's object storage solution for the cloud. Blob storage is optimized for storing massive amounts of unstructured data. Unstructured data is data that doesn't adhere to a particular data model or definition, such as text or binary data.

Spring Boot

Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run". 




Create an Azure Storage Account and blob container using Azure Portal

Sign in to Azure portal https://portal.azure.com/#home and search for "Storage accounts" like below.

You will be taken to a page like the below image, 
Then click on the "Create storage account" button.

Create a storage account,
Enter/Select Resource group, Storage account name, etc... Then click on the "Review + create" button.

You will be taken to a page like the below image,
Then click on the "Create" button.

Now, You can see "Deployment is in progress" like the below image.

Once deployment is completed you can see the "Your deployment is complete" page like the below image.

Then, Create Blob Container, like the below image.

You will be taken to a page like the below image,

Then click on the "Connection String"
Copy "Connection string" and keep it safe for future purposes.




Spring boot web application

Final Project Directory:



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>2.7.1</version>
      <relativePath /> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>spring-azure-storage-blob</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>spring-azure-storage-blob</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>

      <dependency>
         <groupId>com.azure</groupId>
         <artifactId>azure-storage-blob</artifactId>
         <version>12.13.0</version>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>


   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>

</project>



application.yaml

azure:
  storage:
    container:
      name: <Container name>
    connection:
      string: <Connection string>


Azure Blob Configuration

package com.knf.dev.demo.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.azure.storage.blob.BlobContainerClient;
import com.azure.storage.blob.BlobServiceClient;
import com.azure.storage.blob.BlobServiceClientBuilder;

@Configuration
public class AzureBlobConfig {

   @Value("${azure.storage.connection.string}")
   private String connectionString;

   @Value("${azure.storage.container.name}")
   private String containerName;

   @Bean
   public BlobServiceClient clobServiceClient() {
      
      BlobServiceClient blobServiceClient = 
            new BlobServiceClientBuilder()
            .connectionString(connectionString)
         .buildClient();
      
      return blobServiceClient;

   }

   @Bean
   public BlobContainerClient blobContainerClient() {
      
      BlobContainerClient blobContainerClient = 
            clobServiceClient()
      .getBlobContainerClient(containerName);
      
      return blobContainerClient;

   }
}


Azure Blob Service

package com.knf.dev.demo.service;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import com.azure.core.http.rest.PagedIterable;
import com.azure.storage.blob.BlobClient;
import com.azure.storage.blob.BlobContainerClient;
import com.azure.storage.blob.BlobServiceClient;
import com.azure.storage.blob.models.BlobItem;

@Component
public class AzureBlobService {

   @Autowired
   BlobServiceClient blobServiceClient;

   @Autowired
   BlobContainerClient blobContainerClient;

   public String upload(MultipartFile multipartFile) 
        throws IOException {

      // Todo UUID
      BlobClient blob = blobContainerClient
            .getBlobClient(multipartFile.getOriginalFilename());
      blob.upload(multipartFile.getInputStream(),
            multipartFile.getSize(), true);
        
      return multipartFile.getOriginalFilename();
   }

   public byte[] getFile(String fileName) 
        throws URISyntaxException {

      BlobClient blob = blobContainerClient.getBlobClient(fileName);
      ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
      blob.download(outputStream);
      final byte[] bytes = outputStream.toByteArray();
      return bytes;

   }

   public List<String> listBlobs() {

      PagedIterable<BlobItem> items = blobContainerClient.listBlobs();
      List<String> names = new ArrayList<String>();
      for (BlobItem item : items) {
         names.add(item.getName());
      }
      return names;

   }

   public Boolean deleteBlob(String blobName) {

      BlobClient blob = blobContainerClient.getBlobClient(blobName);
      blob.delete();
      return true;
   }

}


Create a Controller

package com.knf.dev.demo.controller;

import java.io.IOException;
import java.net.URISyntaxException;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.knf.dev.demo.service.AzureBlobService;

@RestController
@RequestMapping("/files")
public class AzureController {

   @Autowired
   private AzureBlobService azureBlobAdapter;

   @PostMapping
   public ResponseEntity<String> upload
         (@RequestParam MultipartFile file)
               throws IOException {

      String fileName = azureBlobAdapter.upload(file);
      return ResponseEntity.ok(fileName);
   }

   @GetMapping
   public ResponseEntity<List<String>> getAllBlobs() {

      List<String> items = azureBlobAdapter.listBlobs();
      return ResponseEntity.ok(items);
   }

   @DeleteMapping
   public ResponseEntity<Boolean> delete
           (@RequestParam String fileName) {

      azureBlobAdapter.deleteBlob(fileName);
      return ResponseEntity.ok().build();
   }

   @GetMapping("/download")
   public ResponseEntity<Resource> getFile
      (@RequestParam String fileName)
         throws URISyntaxException {

      ByteArrayResource resource =
            new ByteArrayResource(azureBlobAdapter
         .getFile(fileName));

      HttpHeaders headers = new HttpHeaders();
      headers.add(HttpHeaders.CONTENT_DISPOSITION,
            "attachment; filename=\""
          + fileName + "\"");

      return ResponseEntity.ok().contentType(MediaType
                  .APPLICATION_OCTET_STREAM)
            .headers(headers).body(resource);
   }
}


Spring Boot Main Driver

package com.knf.dev.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

   public static void main(String[] args) {
      SpringApplication.run(Application.class, args);
   }
}


Local Setup and Run the application

Step 1: Download or clone the source code from GitHub to a local machine - Click here


Step 2: mvn clean install


Step 3: Run the Spring Boot application - 

mvn spring-boot:run or Run as Spring Boot application.

Download the complete source code - click here



Testing APIs using the Postman

1. Upload a file



2. Delete a file



3. Get all file names



4. Download a file


Go to the container and you can see the uploaded files,

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