Spring Boot implements fragmented download of large files

We have already talked about uploading and downloading files in 2 lessons. Today we will mainly talk about how to download in pieces. The historical articles are detailed in the following links

• Spring Boot implements file upload and download
• Spring Boot implements large file upload in chunks

1. Benefits of multi-segment downloading

1. Use fragmented downloading: Splitting a large file into multiple small pieces for downloading can reduce memory usage and the risk of network transmission interruption. This can avoid performance problems caused by downloading the entire large file at once.
2. Resume downloading: Implement the resume downloading function, that is, after a download is interrupted, you can continue downloading from the downloaded part without having to re-download the entire file.
3. Progress bar display: Display the download progress on the page, so that users can clearly see the progress of the file download. If the whole download is done at once, the parameters can be directly obtained from the process to calculate (very precise). If it is downloaded in pieces, the total size of the downloaded part is also calculated, but the downloaded part will increase in pieces (not very precise).

Principle of fragment download