Package java.io

Class OutputStreamWriter

java.lang.Object

java.io.Writer

java.io.OutputStreamWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public class OutputStreamWriter
extends Writer

An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified charset. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.

Each invocation of a write() method causes the encoding converter to be invoked on the given character(s). The resulting bytes are accumulated in a buffer before being written to the underlying output stream. The size of this buffer may be specified, but by default it is large enough for most purposes. Note that the characters passed to the write() methods are not buffered.

See Also:

OutputStream

Constructor Summary

Constructors

Constructor	Description
OutputStreamWriter(OutputStream out)	Creates an OutputStreamWriter that uses the default character encoding.
OutputStreamWriter(OutputStream out, String charsetName)	Creates an OutputStreamWriter that uses the named charset.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the stream.
void	flush()	Flushes the stream.
String	getEncoding()	Returns the name of the character encoding being used by this stream.
void	write(char[] cbuf, int off, int len)	Writes a portion of an array of characters.
void	write(int c)	Writes a single character.
void	write(String str, int off, int len)	Writes a portion of a string.

Methods inherited from class java.io.Writer

append, append, append, write, write

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OutputStreamWriter

public OutputStreamWriter(OutputStream out)

Creates an OutputStreamWriter that uses the default character encoding.

Parameters:

out - An OutputStream

OutputStreamWriter

public OutputStreamWriter(OutputStream out,
                          String charsetName)
                   throws UnsupportedEncodingException

Creates an OutputStreamWriter that uses the named charset.

Parameters:

out - An OutputStream

charsetName - The name of a supported charset

Throws:

UnsupportedEncodingException - If the named encoding is not supported

Method Detail

close

public void close()
           throws IOException

Close the stream.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Writer

Throws:

IOException - If an I/O error occurs

flush

public void flush()
           throws IOException

Flushes the stream.

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException - If an I/O error occurs

getEncoding

@Nullable
public String getEncoding()

Returns the name of the character encoding being used by this stream.

If the encoding has an historical name then that name is returned; otherwise the encoding's canonical name is returned.

If this instance was created with the OutputStreamWriter(OutputStream, String) constructor then the returned name, being unique for the encoding, may differ from the name passed to the constructor. This method may return null if the stream has been closed.

Returns:

The historical name of this encoding, or possibly null if the stream has been closed

write

public void write(char[] cbuf,
                  int off,
                  int len)
           throws IOException

Writes a portion of an array of characters.

Specified by:

write in class Writer

Parameters:

cbuf - Buffer of characters

off - Offset from which to start writing characters

len - Number of characters to write

Throws:

IOException - If an I/O error occurs

write

public void write(int c)
           throws IOException

Writes a single character.

Overrides:

write in class Writer

Parameters:

c - int specifying a character to be written

Throws:

IOException - If an I/O error occurs

write

public void write(String str,
                  int off,
                  int len)
           throws IOException

Writes a portion of a string.

Overrides:

write in class Writer

Parameters:

str - A String

off - Offset from which to start writing characters

len - Number of characters to write

Throws:

IOException - If an I/O error occurs