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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class OutputStreamWriter - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.io
Class OutputStreamWriter

java.lang.Object
  |
  +--java.io.Writer
        |
        +--java.io.OutputStreamWriter

Direct Known Subclasses:

FileWriter

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public class OutputStreamWriter

extends Writer

Write characters to an output stream, translating characters into bytes according to a specified character encoding. Each OutputStreamWriter incorporates its own CharToByteConverter, and is thus a bridge from character streams to byte streams.

The encoding used by an OutputStreamWriter may be specified by name, by providing a CharToByteConverter, or by accepting the default encoding, which is defined by the system property file.encoding.

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. For top efficiency, consider wrapping an OutputStreamWriter within a BufferedWriter so as to avoid frequent converter invocations. For example,

 Writer out
   = new BufferedWriter(new OutputStreamWriter(System.out));
 

Since:

JDK1.1

See Also:

BufferedWriter, OutputStream

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Fields inherited from class java.io.Writer

lock

 

Constructor Summary

OutputStreamWriter(OutputStream out)           Create an OutputStreamWriter that uses the default character encoding.

OutputStreamWriter(OutputStream out, String enc)           Create an OutputStreamWriter that uses the named character encoding.

 

Method Summary
void	close()           Close the stream.
void	flush()           Flush the stream.
String	getEncoding()           Returns the canonical name of the character encoding being used by this stream.
void	write(char[] cbuf, int off, int len)           Write a portion of an array of characters.
void	write(int c)           Write a single character.
void	write(String str, int off, int len)           Write a portion of a string.

 

Methods inherited from class java.io.Writer

write, write

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

OutputStreamWriter

public OutputStreamWriter(OutputStream out,
                          String enc)
                   throws UnsupportedEncodingException

Create an OutputStreamWriter that uses the named character encoding.

Parameters:

out - An OutputStream

enc - Name of the encoding to be used

Throws:

UnsupportedEncodingException - If the named encoding is not supported

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OutputStreamWriter

public OutputStreamWriter(OutputStream out)

Create an OutputStreamWriter that uses the default character encoding.

Parameters:

out - An OutputStream

Method Detail

getEncoding

public String getEncoding()

Returns the canonical name of the character encoding being used by this stream. If this OutputStreamWriter was created with the OutputStreamWriter(OutputStream, String) constructor, the returned encoding name, being canonical, may differ from the encoding name passed to the constructor. May return null if the stream has been closed.

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write

public void write(int c)
           throws IOException

Write a single character.

Overrides:

write in class Writer

Throws:

IOException - If an I/O error occurs

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write

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

Write a portion of an array of characters.

Overrides:

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

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write

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

Write 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

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flush

public void flush()
           throws IOException

Flush the stream.

Overrides:

flush in class Writer

Throws:

IOException - If an I/O error occurs

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close

public void close()
           throws IOException

Close the stream.

Overrides:

close in class Writer

Throws:

IOException - If an I/O error occurs

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