org.apache.commons.io
Classes 
ByteOrderMark
CopyUtils
DirectoryWalker
EndianUtils
FileCleaner
FileCleaningTracker
FileDeleteStrategy
FilenameUtils
FileSystemUtils
FileUtils
HexDump
IOCase
IOUtils
LineIterator
Exceptions 
DirectoryWalker.CancelException
FileExistsException
IOExceptionWithCause
TaggedIOException