How to Implement File Upload and Download Functionality in Spring Boot

Quality Thought – Best Full Stack Java Training Course Institute in Hyderabad

When it comes to mastering Java technologies and building a strong foundation for a successful software development career, Quality Thought stands out as the best Full Stack Java training course institute in Hyderabad. With a commitment to bridging the gap between academic learning and industry expectations, Quality Thought offers a comprehensive and hands-on Full Stack Java Developer training program that equips students with in-demand technical skills and real-world project experience.

What sets Quality Thought apart from other training institutes is its live intensive internship program, guided by seasoned industry experts. This unique approach ensures that students not only learn the theoretical aspects of Java development but also gain exposure to real-time use cases, industry workflows, and agile development practices.

This training is ideal for graduates, postgraduates, individuals with education gaps, and those looking for a job domain change into the ever-evolving IT industry. Whether you come from a computer science background or not, the structured curriculum, combined with hands-on learning, personalized mentoring, and placement assistance, ensures a smooth transition into the role of a full stack Java developer.

As part of the course, students are introduced to various advanced topics, including file handling, database integration, RESTful API development, and more. One such practical module includes implementing file upload and download functionality in Spring Boot, which is an essential skill in modern web applications.

How to Implement File Upload and Download Functionality in Spring Boot

Spring Boot makes it easy to build production-ready applications with minimal setup. Here’s a quick guide on how to implement file upload and download functionality in a Spring Boot project.

1. Project Setup

Create a new Spring Boot project using Spring Initializr (https://start.spring.io) and include the following dependencies:

• Spring Web

• Spring Boot DevTools (optional)

• Spring Data JPA (if storing file metadata in DB)

• H2/MySQL (for persistence, optional)

2. File Upload Implementation

Controller:

java

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

    private static final String UPLOAD_DIR = "uploads/";

    @PostMapping("/upload")
    public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file) throws IOException {
        Path path = Paths.get(UPLOAD_DIR + file.getOriginalFilename());
        Files.createDirectories(path.getParent());
        Files.write(path, file.getBytes());
        return ResponseEntity.ok("File uploaded successfully: " + file.getOriginalFilename());
    }
}

3. File Download Implementation

Download Endpoint:

java

@GetMapping("/download/{filename}")
public ResponseEntity<Resource> downloadFile(@PathVariable String filename) throws IOException {
    Path path = Paths.get("uploads/" + filename);
    Resource resource = new UrlResource(path.toUri());

    if (resource.exists()) {
        return ResponseEntity.ok()
            .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
            .body(resource);
    } else {
        throw new FileNotFoundException("File not found: " + filename);
    }
}

4. Configure Application Properties

Add this to application.properties:

properties

spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB

5. Test Your APIs

You can test the endpoints using Postman or any frontend application:

• POST /files/upload with a form-data body containing a file.

• GET /files/download/{filename} to retrieve and download the file.

Why Learn These Skills at Quality Thought?

Incorporating real-world scenarios like file management into the curriculum is one of the reasons why Quality Thought is considered the best Java Full Stack course in Hyderabad. Their curriculum covers:

• Core Java & Advanced Java

• Spring Boot, REST APIs, Microservices

• Angular or React for front-end

• Live project work

• Soft skills & interview preparation

Whether you’re a fresher, a career switcher, or someone with an academic gap, the support system and practical training at Quality Thought ensure you are job-ready by the time you complete your course.

If you’re serious about starting or rebooting your career in Java development, Quality Thought is your go-to institute for professional, placement-driven Java full stack training in Hyderabad.

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