Posted 05 September 2007 - 09:20 PM
Ok, where to start... when you parse the HTML of another website, that is called screen-scraping. It's a rather poor way to get information from a website because anytime they change the format of their webpage, your application breaks. Even with dynamically generated webpages, screen scrapers are not terribly efficient because the number of elements fluctuates from page to page. Also, the content may have a copyright, so check you source.
Java doesn't have any 'functions'; it has classes and class methods. The only 'functions' that I am aware of are static methods. I 'm not at all sure what you mean by java net functions...
JDBC is simply Java Database Connectivity, and it is a specification for a programming interface. I'm sort of curious as to what books you have on the topic. Most J2EE books have a chapter or so that adequately covers the topic.
A web page is simply a text file, so all one needs to do is parse the text. Given that all 'real' languages deal with string manipulation, one could use pretty much any language that one wants.