If you attach the source code, you'll be able to view the javadoc (and of course the source code if you want) in your
IDE. You can download the source jars from any
maven repo. For example, here's the
link of spring core source code (release 3.0.0). As for the javadoc files itself, if you have downloaded spring, the archive has a docs folder which contains an api folder. This is the javadoc for spring