Spring Boot File Upload Example

This is an example project for a file upload in Spring Boot 3.5.7. Uploads can be part of any form using DTOs. In this example you can manage profiles with a resume in PDF or DOC format in a Thymeleaf frontend. Implementation details:

• Separate table FileContent for storing file content
• The entity Profile contains a JSON object FileData with the name and UID of the file
• The FileDataService provides utility functions for uploads and downloads
• The ConverterConfig registers a converter for transforming uploads from MultipartFile to a FileData object transparently
• The annotation ValidFileType ensures the correct file type

This project was created using Bootify.io. Choose your preferred frontend and preferences, create your own database schema including file fields, and get a working Spring Boot application directly in your browser.

Development

Update your local database connection in application.yml or create your own application-local.yml file to override settings for development.

During development it is recommended to use the profile local. In IntelliJ -Dspring.profiles.active=local can be added in the VM options of the Run Configuration after enabling this property in "Modify options".

After starting the application it is accessible under localhost:8080.

Build

The application can be built using the following command:

mvnw clean package

Start your application with the following command - here with the profile production:

java -Dspring.profiles.active=production -jar ./target/file-upload-0.0.1-SNAPSHOT.jar

If required, a Docker image can be created with the Spring Boot plugin. Add SPRING_PROFILES_ACTIVE=production as environment variable when running the container.

mvnw spring-boot:build-image -Dspring-boot.build-image.imageName=io.bootify/file-upload

Further readings

• Maven docs
• Spring Boot reference
• Spring Data JPA reference
• Thymeleaf docs
• Bootstrap docs