Where to begin?? Drupal/java/xml web application

[PSX Nikos]

I am a complete newbie in the programming world.I just set up an Amazon EC2 linux server and got Drupal up and running.Now I need the server to somehow, once a day:1 - access external pages -- xyz.com/1, xyz.com/2, xyz.com/32 - save certain text and numbers from each page's html3 - do some math on the numbers4 - save the text and numbers in an xml file5 - host that xml file on a public facing page on the Drupal site.Basically I am collecting data from an external site and consolidating it in to a single XML file that will be hosted on my site and consumed elsewhere.I have no idea where to begin or what to even search for. I am hoping someone can tell me what tool to use/subject to research and I can take it from there.If I write a java application that does these things, will my drupal site execute it daily and post the output on the website?Thanks a lot.