Java how to plot coordinates on a map in a webserver?

I have a script that spits out an array of lat,lon coordinates every second. What I would like to do is to plot all the coordinates in the array on a map when I go to http://localhost:8000. The map needs to update the coordinates as a new array of coordinates are pushed out from the script.

I've had a look at webservers and javascript but I need a bit of assistance to be pointed in the right direction.

Thank you