org.apache.commons.io
Classes 
CopyUtils
DirectoryWalker
EndianUtils
FileCleaner
FileCleaner.Reaper
FileCleaner.Tracker
FileDeleteStrategy
FileDeleteStrategy.ForceFileDeleteStrategy
FilenameUtils
FileSystemUtils
FileUtils
HexDump
IOCase
IOUtils
LineIterator
Exceptions 
DirectoryWalker.CancelException