Besides extracting them with jar or unzip, you can also use the Midnight Commander (mc) and navigate to these files and press Enter on them as if they were directories.
If this doesn't immediately work, your flavour of mc is not configured to know the .war suffix, but you can still use this feature by typing either
(old mc) or
(mc in Debian unstable) and pressing Enter. As an added benefit, pressing Escape then Enter (in some terminals, also Alt-Enter but this is not portable so don’t depend on it) inserts the current filename into the command line, but you’ll have to press Backspace too because it adds a space, and the #uzip or /uzip:// needs to immediately follow the filename.
This is known as the mc VFS (virtual filesystem).
I won’t repeat the unzip/fastjar/jar answers here, but they’re also correct.