Package org.apache.commons.io

This package defines utility classes for working with streams, readers, writers and files. The most commonly used classes are described here:

IOUtils is the most frequently used class. It provides operations to read, write, copy and close streams.

FileUtils provides operations based around the JDK File class. These include reading, writing, copying, comparing and deleting.

FilenameUtils provides utilities based on filenames. This utility class manipulates filenames without using File objects. It aims to simplify the transition between Windows and Unix. Before using this class however, you should consider whether you should be using File objects.

FileSystemUtils allows access to the filing system in ways the JDK does not support. At present this allows you to get the free space on a drive.

EndianUtils swaps data between Big-Endian and Little-Endian formats.

Class Summary

Class	Description
ByteOrderMark	Byte Order Mark (BOM) representation - see BOMInputStream.
ByteOrderParser	Converts Strings to ByteOrder instances.
Charsets	Charsets required of every implementation of the Java platform.
CopyUtils	Deprecated. Use IOUtils.
DirectoryWalker<T>	Deprecated. Apache Commons IO no longer uses this class.
EndianUtils	Utility code for dealing with different endian systems.
FileCleaner	Deprecated. Use FileCleaningTracker
FileCleaningTracker	Keeps track of files awaiting deletion, and deletes them when an associated marker object is reclaimed by the garbage collector.
FileDeleteStrategy	Strategy for deleting files.
FilenameUtils	General file name and file path manipulation utilities.
FileSystemUtils	Deprecated. As of 2.6 deprecated without replacement.
FileUtils	General file manipulation utilities.
HexDump	Dumps data in hexadecimal format.
IOUtils	General IO stream manipulation utilities.
LineIterator	An Iterator over the lines in a Reader.

Enum Summary

Enum	Description
FileSystem	Abstracts an OS' file system details, currently supporting the single use case of converting a file name String to a legal file name with FileSystem.toLegalFileName(String, char).
IOCase	Enumeration of IO case sensitivity.
StandardLineSeparator	Enumerates standard line separators: StandardLineSeparator.CR, StandardLineSeparator.CRLF, StandardLineSeparator.LF.

Exception Summary

Exception	Description
DirectoryWalker.CancelException	CancelException is thrown in DirectoryWalker to cancel the current processing.
FileExistsException	Indicates that a file already exists.
IOExceptionList	A IOException based on a list of Throwable causes.
IOExceptionWithCause	Deprecated. (since 2.5) use IOException instead
IOIndexedException	A IOException associated with a source index.
TaggedIOException	An IOException decorator that adds a serializable tag to the wrapped exception.