Added in API level 1

Summary: Inherited Fields | Ctors | Methods | Inherited Methods

OutputStreamWriter

public class OutputStreamWriter
extends Writer

java.lang.Object
↳	java.io.Writer
	↳	java.io.OutputStreamWriter

Known direct subclasses

FileWriter

FileWriter Writes text to character files using a default buffer size.

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. 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));

A surrogate pair is a character represented by a sequence of two char values: A high surrogate in the range '\uD800' to '\uDBFF' followed by a low surrogate in the range '\uDC00' to '\uDFFF'.

A malformed surrogate element is a high surrogate that is not followed by a low surrogate or a low surrogate that is not preceded by a high surrogate.

This class always replaces malformed surrogate elements and unmappable character sequences with the charset's default substitution sequence. The CharsetEncoder class should be used when more control over the encoding process is required.

See also:

Summary

Inherited fields

From class java.io.Writer


    protected
    
    
    Object

lock

The object used to synchronize operations on this stream.

Public constructors
`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.
`OutputStreamWriter(OutputStream out, Charset cs)` Creates an OutputStreamWriter that uses the given charset.
`OutputStreamWriter(OutputStream out, CharsetEncoder enc)` Creates an OutputStreamWriter that uses the given charset encoder.

Public methods
`Writer`	`append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this writer.
`Writer`	`append(CharSequence csq)` Appends the specified character sequence to this writer.
`void`	`close()` Closes the stream, flushing it first.
`void`	`flush()` Flushes the stream.
`String`	`getEncoding()` Returns the name of the character encoding being used by this stream.
`void`	`write(int c)` Writes a single character.
`void`	`write(String str, int off, int len)` Writes a portion of a string.
`void`	`write(char[] cbuf, int off, int len)` Writes a portion of an array of characters.

Inherited methods

From class


        
          java.io.Writer

`Writer`	`append(char c)` Appends the specified character to this writer.
`Writer`	`append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this writer.
`Writer`	`append(CharSequence csq)` Appends the specified character sequence to this writer.
`abstract void`	`close()` Closes the stream, flushing it first.
`abstract void`	`flush()` Flushes the stream.
`static Writer`	`nullWriter()` Returns a new `Writer` which discards all characters.
`void`	`write(String str)` Writes a string.
`void`	`write(int c)` Writes a single character.
`void`	`write(String str, int off, int len)` Writes a portion of a string.
`abstract void`	`write(char[] cbuf, int off, int len)` Writes a portion of an array of characters.
`void`	`write(char[] cbuf)` Writes an array of characters.

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface


        
          java.lang.Appendable

`abstract Appendable`	`append(char c)` Appends the specified character to this `Appendable`.
`abstract Appendable`	`append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this `Appendable`.
`abstract Appendable`	`append(CharSequence csq)` Appends the specified character sequence to this `Appendable`.

From interface


        
          java.io.Closeable


      close()

Closes this stream and releases any system resources associated with it.

From interface


        
          java.io.Flushable


      flush()

Flushes this stream by writing any buffered output to the underlying stream.

From interface


        
          java.lang.AutoCloseable


      close()

Closes this resource, relinquishing any underlying resources.

Public constructors

OutputStreamWriter

Added in API level 1

public OutputStreamWriter (OutputStream out)

Creates an OutputStreamWriter that uses the default character encoding.

Parameters
`out`	`OutputStream`: An OutputStream

OutputStreamWriter

Added in API level 1

public OutputStreamWriter (OutputStream out, 
                String charsetName)

Creates an OutputStreamWriter that uses the named charset.

Parameters
`out`	`OutputStream`: An OutputStream
`charsetName`	`String`: The name of a supported `charset`

Throws
`UnsupportedEncodingException`	If the named encoding is not supported

OutputStreamWriter

Added in API level 1

public OutputStreamWriter (OutputStream out, 
                Charset cs)

Creates an OutputStreamWriter that uses the given charset.

Parameters
`out`	`OutputStream`: An OutputStream
`cs`	`Charset`: A charset

OutputStreamWriter

Added in API level 1

public OutputStreamWriter (OutputStream out, 
                CharsetEncoder enc)

Creates an OutputStreamWriter that uses the given charset encoder.

Parameters
`out`	`OutputStream`: An OutputStream
`enc`	`CharsetEncoder`: A charset encoder

Public methods

append

Added in API level 1

public Writer append (CharSequence csq, 
                int start, 
                int end)

Appends a subsequence of the specified character sequence to this writer. Appendable.

An invocation of this method of the form out.append(csq, start, end) when csq is not null behaves in exactly the same way as the invocation

out.write(csq.subSequence(start, end).toString())

Parameters
`csq`	`CharSequence`: The character sequence from which a subsequence will be appended. If `csq` is `null`, then characters will be appended as if `csq` contained the four characters `"null"`.
`start`	`int`: The index of the first character in the subsequence
`end`	`int`: The index of the character following the last character in the subsequence

Returns
`Writer`	This writer

Throws
`IOException`

append

Added in API level 1

public Writer append (CharSequence csq)

Appends the specified character sequence to this writer.

An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation

     out.write(csq.toString())

Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.

Parameters
`csq`	`CharSequence`: The character sequence to append. If `csq` is `null`, then the four characters `"null"` are appended to this writer.

Returns
`Writer`	This writer

Throws
`IOException`

close

Added in API level 1

public void close ()

Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.

Throws
`IOException`

flush

Added in API level 1

public void flush ()

Flushes the stream.

Throws
`IOException`	If an I/O error occurs

getEncoding

Added in API level 1

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(java.io.OutputStream, java.lang.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
`String`	The historical name of this encoding, or possibly `null` if the stream has been closed

See also:

Charset

write

Added in API level 1

public void write (int c)

Writes a single character.

Parameters
`c`	`int`: int specifying a character to be written

Throws
`IOException`	If an I/O error occurs

write

Added in API level 1

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

Writes a portion of a string.

Parameters
`str`	`String`: A String
`off`	`int`: Offset from which to start writing characters
`len`	`int`: Number of characters to write

Throws
`IndexOutOfBoundsException`	If `off` is negative, or `len` is negative, or `off + len` is negative or greater than the length of the given string
`IOException`	If an I/O error occurs

write

Added in API level 1

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

Writes a portion of an array of characters.

Parameters
`cbuf`	`char`: Buffer of characters
`off`	`int`: Offset from which to start writing characters
`len`	`int`: Number of characters to write

Throws
`IndexOutOfBoundsException`	If `off` is negative, or `len` is negative, or `off + len` is negative or greater than the length of the given array
`IOException`	If an I/O error occurs