I'll help you create the UI components for file upload and download. Since you're using HTML, CSS, and JavaScript, we'll create a simple yet functional UI. ```html File Sharing Platform

File Sharing Platform

``` This code creates a simple UI with: 1. A file input to select files 2. An upload button to submit files to the server 3. A list of existing files with download buttons 4. JavaScript functions to handle file upload and download operations Key features: - Multiple file upload support - Download button for each file - Error handling and user feedback - Clean and responsive design - Automatic loading of existing files To connect this with your Spring Boot backend: 1. The upload functionality uses the endpoint `/api/upload` 2. The download functionality uses the endpoint `/api/download/{fileName}` 3. The file list loads from `/api/files` Make sure your Spring Boot controllers have these endpoints implemented. Next steps: 1. Test the UI by uploading and downloading files 2. Add error handling and loading states 3. Add file type and size validations 4. Style the UI to match your application's theme To learn more about: - HTML File Input: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file - Fetch API: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API - JavaScript Blob: https://developer.mozilla.org/en-US/docs/Web/API/Blob