Documents Bulk Uploader is a Java application that allows importing files as documents in a bulk manner. With Documents Bulk Uploader, you can upload the files located in a folder from your local drive (the "source folder") into a specified folder of a Jira project (the "destination folder"). In the source folder, you can have as many sub-folders as you want; the upload process will create a folder structure in Documents as the one from the specified source folder. The files are imported as documents of type File.
Documents Bulk Uploader can be used for day-by-day document import but also when migrating from another document management system.
A list of the available versions of Documents Bulk Uploader, along with links to documentation, can be found here.