You only need the commons-io-2.4.jar
to use the library.
Explanation on the other ones
commons-io-2.4-sources.jar
: sourcecode for commons-io-2.4.jar
commons-io-2.4-javadoc.jar
: documentation for commons-io-2.4.jar
commons-io-2.4-tests.jar
: tests for commons-io-2.4.jar
commons-io-2.4-test-sources.jar
: sourcecode for commons-io-2.4-tests.jar