All Classes

Class	Description
AbstractByteArrayOutputStream<T extends AbstractByteArrayOutputStream<T>>	This is the base class for implementing an output stream in which the data is written into a byte array.
AbstractByteArrayOutputStream.InputStreamConstructor<T extends java.io.InputStream>	Constructor for an InputStream subclass.
AbstractCharacterFilterReader	A filter reader that filters out characters where subclasses decide which characters to filter out.
AbstractFileFilter	Abstracts the implementation of the FileFilter (IO), FilenameFilter (IO), PathFilter (NIO) interfaces via our own IOFileFilter interface.
AbstractInputStream	Abstracts some InputStream operations for implementations in this package.
AbstractOrigin<T,B extends AbstractOrigin<T,B>>	Abstracts and wraps an origin for builders, where an origin is a byte[], Channel, CharSequence, File, InputStream, IORandomAccessFile, OutputStream, Path, RandomAccessFile, Reader, URI, or Writer.
AbstractOrigin.AbstractRandomAccessFileOrigin<T extends java.io.RandomAccessFile,B extends AbstractOrigin.AbstractRandomAccessFileOrigin<T,B>>	A RandomAccessFile origin.
AbstractOrigin.ByteArrayOrigin	A byte[] origin.
AbstractOrigin.ChannelOrigin	A Channel origin.
AbstractOrigin.CharSequenceOrigin	A CharSequence origin.
AbstractOrigin.FileOrigin	A File origin.
AbstractOrigin.InputStreamOrigin	An InputStream origin.
AbstractOrigin.IORandomAccessFileOrigin	An IORandomAccessFile origin.
AbstractOrigin.OutputStreamOrigin	An OutputStream origin.
AbstractOrigin.PathOrigin	A Path origin.
AbstractOrigin.RandomAccessFileOrigin	A RandomAccessFile origin.
AbstractOrigin.ReaderOrigin	A Reader origin.
AbstractOrigin.URIOrigin	A URI origin.
AbstractOrigin.WriterOrigin	A Writer origin.
AbstractOriginSupplier<T,B extends AbstractOriginSupplier<T,B>>	Abstracts building an instance of type T where T is unbounded from a wrapped origin.
AbstractStreamBuilder<T,B extends AbstractStreamBuilder<T,B>>	Abstracts building a typed instance of type T where T is unbounded.
AbstractSupplier<T,B extends AbstractSupplier<T,B>>	Abstracts supplying an instance of type T where T is unbounded.
AccumulatorPathVisitor	Accumulates normalized paths during visitation.
AccumulatorPathVisitor.Builder	Builds instances of AccumulatorPathVisitor.
AgeFileFilter	Filters files based on a cutoff time, can filter either newer files or files equal to or older.
AndFileFilter	A FileFilter providing conditional AND logic across a list of file filters.
AppendableOutputStream<T extends java.lang.Appendable>	OutputStream implementation that writes the data to an Appendable Object.
AppendableWriter<T extends java.lang.Appendable>	Writer implementation that writes the data to an Appendable Object.
AutoCloseInputStream	Proxy stream that closes and discards the underlying stream as soon as the end of input has been reached or when the stream is explicitly closed.
AutoCloseInputStream.Builder	Builds a new AutoCloseInputStream instance.
BOMInputStream	This class is used to wrap a stream that includes an encoded ByteOrderMark as its first bytes.
BOMInputStream.Builder	Builds a new BOMInputStream.
BoundedInputStream	Reads bytes up to a maximum count and stops once reached.
BoundedInputStream.Builder	Builds a new BoundedInputStream.
BoundedReader	A reader that imposes a limit to the number of characters that can be read from an underlying reader, returning EOF when this limit is reached, regardless of state of underlying reader.
BrokenInputStream	Always throws an exception from all InputStream methods where IOException is declared.
BrokenOutputStream	Always throws an exception from all OutputStream methods where IOException is declared.
BrokenReader	Always throws an exception from all Reader methods where IOException is declared.
BrokenWriter	Always throws an exception from all Writer methods where IOException is declared.
BufferedFileChannelInputStream	InputStream implementation which uses direct buffer to read a file to avoid extra copy of data between Java and native memory which happens when using BufferedInputStream.
BufferedFileChannelInputStream.Builder	Builds a new BufferedFileChannelInputStream.
ByteArrayOutputStream	Implements a ThreadSafe version of AbstractByteArrayOutputStream using instance synchronization.
ByteArraySeekableByteChannel	A SeekableByteChannel implementation backed by a byte array.
ByteBuffers	Manufactures ByteBuffer instances.
ByteOrderMark	Byte Order Mark (BOM) representation.
ByteOrderParser	Converts Strings to ByteOrder instances.
CanExecuteFileFilter	This filter accepts Files that can be executed.
CanReadFileFilter	This filter accepts Files that can be read.
CanWriteFileFilter	This filter accepts Files that can be written to.
CharacterFilterReader	A filter reader that filters out a given character represented as an int code point, handy to remove known junk characters from CSV files for example.
CharacterSetFilterReader	A filter reader that removes a given set of characters represented as int code points, handy to remove known junk characters from CSV files for example.
CharSequenceInputStream	Implements an InputStream to read bytes from String, StringBuffer, StringBuilder or CharBuffer, encoded using the specified Charset.
CharSequenceInputStream.Builder	Builds a new CharSequenceInputStream.
CharSequenceReader	Reader implementation that can read from String, StringBuffer, StringBuilder or CharBuffer.
CharsetDecoders	Works with CharsetDecoder.
CharsetEncoders	Works with CharsetEncoder.
Charsets	Charsets required of every implementation of the Java platform.
ChecksumInputStream	Automatically verifies a Checksum value once the stream is exhausted or the count threshold is reached.
ChecksumInputStream.Builder	Builds a new ChecksumInputStream.
ChunkedOutputStream	OutputStream which breaks larger output blocks into chunks.
ChunkedOutputStream.Builder	Builds a new UnsynchronizedByteArrayOutputStream.
ChunkedWriter	Writer which breaks larger output blocks into chunks.
CircularBufferInputStream	Implements a buffered input stream, which is internally based on a CircularByteBuffer.
CircularByteBuffer	A buffer, which doesn't need reallocation of byte arrays, because it reuses a single byte array.
CircularInputStream	An InputStream that repeats provided bytes for given target byte count.
ClassLoaderObjectInputStream	A special ObjectInputStream that loads a class based on a specified ClassLoader rather than the system default.
ClassNameMatcher	An object that matches a Class name to a condition.
CleaningPathVisitor	Deletes files but not directories as a visit proceeds.
ClosedInputStream	Always returns IOUtils.EOF to all attempts to read something from an input stream.
ClosedOutputStream	Throws an IOException on all attempts to write to the stream.
ClosedReader	Always returns IOUtils.EOF to all attempts to read something from it.
ClosedWriter	Throws an IOException on all attempts to write with ClosedWriter.close() implemented as a noop.
CloseShieldChannel	Creates a close-shielding proxy for a Channel.
CloseShieldInputStream	Proxy stream that prevents the underlying input stream from being closed.
CloseShieldOutputStream	Proxy stream that prevents the underlying output stream from being closed.
CloseShieldReader	Proxy reader that prevents the underlying reader from being closed.
CloseShieldWriter	Proxy writer that prevents the underlying writer from being closed.
CompositeFileComparator	Compare two files using a set of delegate file Comparator.
ConditionalFileFilter	Defines operations for conditional file filters.
CopyDirectoryVisitor	Copies a source directory to a target directory.
CopyUtils	Deprecated. Use IOUtils.
Counters	Provides counters for files, directories, and sizes, as a visit proceeds.
Counters.Counter	Counts using a number.
Counters.PathCounters	Counts files, directories, and sizes, as a visit proceeds.
CountingInputStream	Deprecated. Use BoundedInputStream (unbounded by default).
CountingOutputStream	A decorating output stream that counts the number of bytes that have passed through.
CountingPathVisitor	Counts files, directories, and sizes, as a visit proceeds.
CountingPathVisitor.AbstractBuilder<T,B extends CountingPathVisitor.AbstractBuilder<T,B>>	Builds instances of CountingPathVisitor.
CountingPathVisitor.Builder	Builds instances of CountingPathVisitor.
DefaultFileComparator	Compares two files using the default File.compareTo(File) method.
DeferredFileOutputStream	An output stream which will retain data in memory until a specified threshold is reached, and only then commit it to disk.
DeferredFileOutputStream.Builder	Builds a new DeferredFileOutputStream.
DelegateFileFilter	This class turns a Java FileFilter or FilenameFilter into an IO FileFilter.
DeleteOption	An object that configures how to delete a file.
DeletingPathVisitor	Deletes files and directories as a visit proceeds.
DemuxInputStream	Data written to this stream is forwarded to a stream that has been associated with this thread.
DemuxOutputStream	Forwards data to a stream that has been associated with this thread.
DirectoryFileComparator	Compare two files using the File.isDirectory() method.
DirectoryFileFilter	This filter accepts Files that are directories.
DirectoryStreamFilter	A DirectoryStream.Filter that delegates to a PathFilter.
DirectoryWalker<T>	Deprecated. Apache Commons IO no longer uses this class.
DirectoryWalker.CancelException	CancelException is thrown in DirectoryWalker to cancel the current processing.
EmptyFileFilter	This filter accepts files or directories that are empty.
EndianUtils	Helps with reading and writing primitive numeric types (short, int, long, float, and double) that are encoded in little-endian using two's complement or unsigned representations.
Erase	Erases IOException for the compiler but still throws that exception at runtime.
ExtensionFileComparator	Compare the file name extensions for order (see FilenameUtils.getExtension(String)).
FalseFileFilter	A file filter that always returns false.
FileAlterationListener	Receives events of file system modifications.
FileAlterationListenerAdaptor	Convenience FileAlterationListener implementation that does nothing.
FileAlterationMonitor	A runnable that spawns a monitoring thread triggering any registered FileAlterationObserver at a specified interval.
FileAlterationObserver	FileAlterationObserver represents the state of files below a root directory, checking the file system and notifying listeners of create, change or delete events.
FileAlterationObserver.Builder	Builds instances of FileAlterationObserver.
FileChannels	Works with FileChannel.
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.
FileEntry	The state of a file or directory, capturing the following File attributes at a point in time.
FileEqualsFileFilter	Accepts only an exact File object match.
FileExistsException	Indicates that a file already exists.
FileFileFilter	This filter accepts Files that are files (not directories).
FileFilterUtils	Useful utilities for working with file filters.
FilenameUtils	General file name and file path manipulation utilities.
FilesUncheck	Delegates to Files to uncheck calls by throwing UncheckedIOException instead of IOException.
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).
FileSystemProviders	Helps to work with FileSystemProvider.
FileSystemUtils	Deprecated. As of 2.6 deprecated without replacement.
FileTimes	Helps use FileTime and interoperate Date and NTFS times.
FileUtils	General file manipulation utilities.
FileWriterWithEncoding	Writer of files that allows the encoding to be set.
FileWriterWithEncoding.Builder	Builds a new FileWriterWithEncoding.
FilterCollectionWriter	Abstract class for writing filtered character streams to a Collection of writers.
HexDump	Dumps data in hexadecimal format.
HiddenFileFilter	This filter accepts Files that are hidden.
InfiniteCircularInputStream	An InputStream that infinitely repeats the provided bytes.
IOBaseStream<T,S extends IOBaseStream<T,S,B>,B extends java.util.stream.BaseStream<T,B>>	Like BaseStream but throws IOException.
IOBiConsumer<T,U>	Like BiConsumer but throws IOException.
IOBiFunction<T,U,R>	Like BiFunction but throws IOException.
IOBinaryOperator<T>	Like BinaryOperator but throws IOException.
IOBooleanSupplier	Like BooleanSupplier but throws IOException.
IOCase	Enumeration of IO case sensitivity.
IOComparator<T>	Like Comparator but throws IOException.
IOConsumer<T>	Like Consumer but throws IOException.
IOExceptionList	An IOException based on a list of Throwable causes.
IOExceptionWithCause	Deprecated. (since 2.5) use IOException instead
IOFileFilter	An interface which brings the FileFilter, FilenameFilter, PathFilter, and PathMatcher interfaces together.
IOFunction<T,R>	Like Function but throws IOException.
IOIndexedException	A IOException associated with a source index.
IOIntConsumer	Like IntConsumer but throws IOException.
IOIntSupplier	Like IntSupplier but throws IOException.
IOIterable<T>	Like Iterable but throws IOException.
IOIterator<E>	Like Iterator but throws IOException.
IOLongSupplier	Like LongSupplier but throws IOException.
IOPredicate<T>	Like Predicate but throws IOException.
IOQuadFunction<T,U,V,W,R>	Represents a function that accepts four arguments and produces a result.
IORandomAccessFile	Extends RandomAccessFile to provide access to the File and mode passed on construction.
IORunnable	Like Runnable but throws IOException.
IOSpliterator<T>	Like Spliterator but throws IOException.
IOStream<T>	Like Stream but throws IOException.
IOSupplier<T>	Like Supplier but throws IOException.
IOTriConsumer<T,U,V>	Like BiConsumer but throws IOException.
IOTriFunction<T,U,V,R>	Represents a function that accepts three arguments and produces a result.
IOUnaryOperator<T>	Like UnaryOperator but throws IOException.
IOUtils	General IO stream manipulation utilities.
LastModifiedFileComparator	Compare the last modified date/time of two files for order (see FileUtils.lastModifiedUnchecked(File)).
LineIterator	An Iterator over the lines in a Reader.
LockableFileWriter	FileWriter that will create and honor lock files to allow simple cross thread file lock handling.
LockableFileWriter.Builder	Builds a new LockableFileWriter.
MagicNumberFileFilter	File filter for matching files containing a "magic number".
MarkShieldInputStream	This is an alternative to ByteArrayInputStream which removes the synchronization overhead for non-concurrent access; as such this class is not thread-safe.
MemoryMappedFileInputStream	An InputStream that utilizes memory mapped files to improve performance.
MemoryMappedFileInputStream.Builder	Builds a new MemoryMappedFileInputStream.
MessageDigestCalculatingInputStream	Deprecated. Use MessageDigestInputStream.
MessageDigestCalculatingInputStream.Builder	Builds a new MessageDigestCalculatingInputStream.
MessageDigestCalculatingInputStream.MessageDigestMaintainingObserver	Maintains the message digest.
MessageDigestInputStream	This class is an example for using an ObservableInputStream.
MessageDigestInputStream.Builder	Builds new MessageDigestInputStream.
MessageDigestInputStream.MessageDigestMaintainingObserver	Maintains the message digest.
NameFileComparator	Compare the names of two files for order (see File.getName()).
NameFileFilter	Filters file names for a certain name.
NoopPathVisitor	A noop path visitor.
NotFileFilter	This filter produces a logical NOT of the filters specified.
NullAppendable	Appends all data to the famous /dev/null.
NullInputStream	A lightweight InputStream that emulates a stream of a specified size.
NullOutputStream	Never writes data.
NullPrintStream	Never prints data.
NullReader	A functional, lightweight Reader that emulates a reader of a specified size.
NullWriter	Never writes data.
ObjectStreamClassPredicate	A predicate (boolean-valued function) of one argument to accept and reject classes.
ObservableInputStream	The ObservableInputStream allows, that an InputStream may be consumed by other receivers, apart from the thread, which is reading it.
ObservableInputStream.AbstractBuilder<T extends ObservableInputStream.AbstractBuilder<T>>	For subclassing builders from BoundedInputStream subclassses.
ObservableInputStream.Builder	Builds instances of ObservableInputStream.
ObservableInputStream.Observer	Abstracts observer callback for ObservableInputStreams.
OrFileFilter	A FileFilter providing conditional OR logic across a list of file filters.
PathEqualsFileFilter	Accepts only an exact Path object match.
PathFileComparator	Compare the path of two files for order (see File.getPath()).
PathFilter	A filter for Paths.
PathMatcherFileFilter	Delegates matching to a PathMatcher.
PathUtils	NIO Path utilities.
PathVisitor	A FileVisitor typed to a Path.
PathVisitorFileFilter	A file filter backed by a path visitor.
PeekableInputStream	Implements a buffered input stream, which allows to peek into the buffers first bytes.
PrefixFileFilter	Filters file names for a certain prefix.
ProxyCollectionWriter	A Proxy stream collection which acts as expected, that is it passes the method calls on to the proxied streams and doesn't change which methods are being called.
ProxyInputStream	A proxy stream which acts as a FilterInputStream, by passing all method calls on to the proxied stream, not changing which methods are called.
ProxyInputStream.AbstractBuilder<T,B extends AbstractStreamBuilder<T,B>>	Abstracts builder properties for subclasses.
ProxyOutputStream	A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.
ProxyOutputStream.Builder	Builds instances of ProxyOutputStream.
ProxyReader	A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.
ProxyWriter	A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.
QueueInputStream	Simple alternative to JDK PipedInputStream; queue input stream provides what's written in queue output stream.
QueueInputStream.Builder	Builds a new QueueInputStream.
QueueOutputStream	Simple alternative to JDK PipedOutputStream; queue input stream provides what's written in queue output stream.
RandomAccessFileInputStream	Streams data from a RandomAccessFile starting at its current position.
RandomAccessFileInputStream.Builder	Builds a new RandomAccessFileInputStream.
RandomAccessFileMode	Enumerates access modes for RandomAccessFile with factory methods.
RandomAccessFileOutputStream	An OutputStream that writes to a RandomAccessFile.
RandomAccessFileOutputStream.Builder	Builds a new RandomAccessFileOutputStream.
RandomAccessFiles	Works with RandomAccessFile.
ReadAheadInputStream	Implements InputStream to asynchronously read ahead from an underlying input stream when a specified amount of data has been read from the current buffer.
ReadAheadInputStream.Builder	Builds a new ReadAheadInputStream.
ReaderInputStream	InputStream implementation that reads a character stream from a Reader and transforms it to a byte stream using a specified charset encoding.
ReaderInputStream.Builder	Builds a new ReaderInputStream.
RegexFileFilter	Filters files using supplied regular expression(s).
ReversedLinesFileReader	Reads lines in a file reversely (similar to a BufferedReader, but starting at the last line).
ReversedLinesFileReader.Builder	Builds a new ReversedLinesFileReader.
SequenceReader	Provides the contents of multiple Readers in sequence.
SimplePathVisitor	A SimpleFileVisitor typed to a Path.
SimplePathVisitor.AbstractBuilder<T,B extends AbstractSupplier<T,B>>	Abstracts builder for subclasses.
SizeFileComparator	Compare the length/size of two files for order (see File.length() and FileUtils.sizeOfDirectory(File)).
SizeFileFilter	Filters files based on size, can filter either smaller files or files equal to or larger than a given threshold.
StandardDeleteOption	Defines the standard delete options.
StandardLineSeparator	Enumerates standard line separators: StandardLineSeparator.CR, StandardLineSeparator.CRLF, StandardLineSeparator.LF.
StreamIterator<E>	Wraps and presents a Stream as a AutoCloseable Iterator resource that automatically closes itself when reaching the end of stream.
StringBuilderWriter	Writer implementation that outputs to a StringBuilder.
SuffixFileFilter	Filters files based on the suffix (what the file name ends with).
SwappedDataInputStream	DataInput for systems relying on little-endian data formats.
SymbolicLinkFileFilter	This filter accepts Files that are symbolic links.
TaggedInputStream	An input stream decorator that tags potential exceptions so that the stream that caused the exception can easily be identified.
TaggedIOException	An IOException decorator that adds a serializable tag to the wrapped exception.
TaggedOutputStream	An output stream decorator that tags potential exceptions so that the stream that caused the exception can easily be identified.
TaggedReader	A reader decorator that tags potential exceptions so that the reader that caused the exception can easily be identified.
TaggedWriter	A writer decorator that tags potential exceptions so that the reader that caused the exception can easily be identified.
Tailer	Simple implementation of the Unix "tail -f" functionality.
Tailer.Builder	Builds a new Tailer.
Tailer.RandomAccessResourceBridge	Bridges access to a resource for random access, normally a file.
Tailer.Tailable	A tailable resource like a file.
TailerListener	Listens to events from a Tailer.
TailerListenerAdapter	TailerListener Adapter.
TeeInputStream	InputStream proxy that transparently writes a copy of all bytes read from the proxied stream to a given OutputStream.
TeeOutputStream	Classic splitter of OutputStream.
TeeReader	Reader proxy that transparently writes a copy of all characters read from the proxied reader to a given Reader.
TeeWriter	Classic splitter of Writer.
ThreadUtils	Helps work with threads.
ThresholdingOutputStream	An output stream which triggers an event on the first write that causes the total number of bytes written to the stream to exceed a configured threshold, and every subsequent write.
ThrottledInputStream	Provides bandwidth throttling on an InputStream as a filter input stream.
ThrottledInputStream.Builder	Builds a new ThrottledInputStream.
TimestampedObserver	An observer with timestamps.
TrueFileFilter	A file filter that always returns true.
Uncheck	Unchecks calls by throwing UncheckedIOException instead of IOException.
UncheckedAppendable	An Appendable that throws UncheckedIOException instead of IOException.
UncheckedBufferedReader	A BufferedReader that throws UncheckedIOException instead of IOException.
UncheckedBufferedReader.Builder	Builds a new UncheckedBufferedReader.
UncheckedFilterInputStream	A BufferedReader that throws UncheckedIOException instead of IOException.
UncheckedFilterInputStream.Builder	Builds a new UncheckedFilterInputStream.
UncheckedFilterOutputStream	A FilterOutputStream that throws UncheckedIOException instead of UncheckedIOException.
UncheckedFilterOutputStream.Builder	Builds a new UncheckedFilterOutputStream.
UncheckedFilterReader	A FilterReader that throws UncheckedIOException instead of IOException.
UncheckedFilterReader.Builder	Builds a new UncheckedFilterReader.
UncheckedFilterWriter	A FilterWriter that throws UncheckedIOException instead of IOException.
UncheckedFilterWriter.Builder	Builds a new UncheckedFilterWriter.
UnixLineEndingInputStream	A filtering input stream that ensures the content will have UNIX-style line endings, LF.
UnsynchronizedBufferedInputStream	An unsynchronized version of BufferedInputStream, not thread-safe.
UnsynchronizedBufferedInputStream.Builder	Builds a new UnsynchronizedBufferedInputStream.
UnsynchronizedBufferedReader	Wraps an existing Reader and buffers the input without any synchronization.
UnsynchronizedByteArrayInputStream	This is an alternative to ByteArrayInputStream which removes the synchronization overhead for non-concurrent access; as such this class is not thread-safe.
UnsynchronizedByteArrayInputStream.Builder	Builds a new UnsynchronizedByteArrayInputStream.
UnsynchronizedByteArrayOutputStream	Implements a version of AbstractByteArrayOutputStream without any concurrent thread safety.
UnsynchronizedByteArrayOutputStream.Builder	Builds a new UnsynchronizedByteArrayOutputStream.
UnsynchronizedFilterInputStream	An unsynchronized version of FilterInputStream, not thread-safe.
UnsynchronizedFilterInputStream.Builder	Builds a new UnsynchronizedFilterInputStream.
UnsynchronizedReader	A Reader without any of the superclass' synchronization.
ValidatingObjectInputStream	An ObjectInputStream that's restricted to deserialize a limited set of classes.
ValidatingObjectInputStream.Builder	Builds a new ValidatingObjectInputStream.
WildcardFileFilter	Filters files using the supplied wildcards.
WildcardFileFilter.Builder	Builds a new WildcardFileFilter instance.
WildcardFilter	Deprecated. Use WildcardFileFilter.
WindowsLineEndingInputStream	A filtering input stream that ensures the content will have Windows line endings, CRLF.
WriterOutputStream	OutputStream implementation that transforms a byte stream to a character stream using a specified charset encoding and writes the resulting stream to a Writer.
WriterOutputStream.Builder	Builds a new WriterOutputStream.
XmlStreamReader	Character stream that handles all the necessary Voodoo to figure out the charset encoding of the XML document within the stream.
XmlStreamReader.Builder	Builds a new XmlStreamReader.
XmlStreamReaderException	The XmlStreamReaderException is thrown by the XmlStreamReader constructors if the charset encoding cannot be determined according to the XML 1.0 specification and RFC 3023.
XmlStreamWriter	Character stream that handles all the necessary work to figure out the charset encoding of the XML document written to the stream.
XmlStreamWriter.Builder	Builds a new XmlStreamWriter.