The zipdiff tool compares the contents of two zip files. It is
equally suited for comparing jar, EAR, WAR, or RAR files.
The project includes a task for Ant.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release has new command line options, improved documentation, improved error handling, an improved Ant task, improved HTML output (zipdiff.output.HTMLBuilder), and a new zipdiff.output.AbstractBuilder class.