Simply Hosting Files with Java

I am searching for a simple solution in java, and am afraid I am just not using the right terminology for it.

I have a directory of MP3 files I want to make available through my server. SO if I went to "localhost:1000/track1.mp3" i would be able to access that file.

In the past I have used Flask with python, and basically have been able to make entire file directories available through localhost, allowing me to go into sub directories such as : localhost:8000/subdir1/file.mp3". etc.

Does that make sense? Is there a simple solution to do this? I have been struggling to find one.