Import schedules from JSP pages to Google calendar

Import schedules from JSP pages to Google calendar

here's the problem: my college has an online JSP calendar with courses
schedule that can change very often. it doesn't allowed to export the
schedule in calendar format. And The access is protected by password and
login (i have them). Now what I want to do is to import this calendar into
my google's one or at leat to retrieve these course schedule data from the
server. Simply adding the URL won't work as the target is a JPS file nor
using a webot. Since my browser is able to display the schedule data, it
means that they are available to me. So is there any web application to
retrieve them ? any web application technology i can use to achieve this ?
thanks