JFilecChooser for web applications

I have a web application that executes just fine, but now need to add a DIRECTORY widget to allow the user to select a directory and the uploading to the server many data files.

The web application is secured to only specific individuals via Security Roles etc. so no problem there.

The user will be posted by CD, or emailed the files to be uploaded from a third party so the files can exist on a user machine machine not just the server.

I know about jFileChooser which allows the choosing of only directories for java local applications but can't find an equivalent for a web application.

How do I do the equivalent for web applications? MTIA