Datasource question

I have a few questions:

First off, where can I find the documentation for jdbc7.1-1.3.jar, the class
documentation...It is not included with this jar file...Do I need to have
postgresql version 7.1.3 installed in order to use this package..

I'm trying to use a datasource to connect to the postgresql database..

My application is a swing application...

what class do I instantiate to get a datasource object..

$some_class ds = new $some_class
InitialContext() it = new InitialContext();

ds = (DataSource)it.lookup("java:comp/env/jdbc/AccountExplDs");

Thank you.....

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