A comprehensive guide to implementing secure file upload and download functionality in Spring Boot applications. Covers production-ready practices including storing file metadata in MongoDB while keeping actual files on the filesystem, implementing proper validation and security measures to prevent directory traversal attacks, creating organized folder structures by date, and handling multipart requests. The tutorial demonstrates both local file storage and discusses cloud storage alternatives like AWS S3, emphasizing security best practices such as MIME type validation, unique filename generation, and file size limits.
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