InputStreamReader (FlexDoc/Javadoc 2.0 Demo)

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters 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 one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation.

For top efficiency, consider wrapping an InputStreamReader within a BufferedReader. For example:

 BufferedReader in
   = new BufferedReader(new InputStreamReader(anInputStream));

Since:

1.1

Author:

Mark Reinhold

See Also:

Charset

read

public int read	(CharBuffer target)
throws	IOException

Description copied from class: Reader

Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.

Specified by:

read in interface Readable

Overrides:

read in class Reader

Parameters:

target - the buffer to read characters into

Returns:

The number of characters added to the buffer, or -1 if this source of characters is at its end

Throws:

IOException - if an I/O error occurs

read

public int read	()
throws	IOException

Reads a single character.

Overrides:

read in class Reader

Returns:

The character read, or -1 if the end of the stream has been reached

Throws:

IOException - If an I/O error occurs

read

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

Reads characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.

If len is zero, then no characters are read and 0 is returned; otherwise, there is an attempt to read at least one character. If no character is available because the stream is at its end, the value -1 is returned; otherwise, at least one character is read and stored into cbuf.

Overrides:

read in class Reader

Parameters:

cbuf - Destination buffer

off - Offset at which to start storing characters

len - Maximum number of characters to read

Returns:

The number of characters read, or -1 if the end of the stream has been reached

Throws:

IndexOutOfBoundsException - If off is negative, or len is negative, or len is greater than cbuf.length - off

IOException - If an I/O error occurs

ready

public boolean ready	()
throws	IOException

Tells whether this stream is ready to be read. An InputStreamReader is ready if its input buffer is not empty, or if bytes are available to be read from the underlying byte stream.

Overrides:

ready in class Reader

Returns:

True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

Throws:

IOException - If an I/O error occurs

public void close	()
throws	IOException

Description copied from class: Reader

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

Specified by:

close in interface Closeable

close in interface AutoCloseable

Overrides:

close in class Reader

Throws:

IOException - If an I/O error occurs

Overview

Module

Package

Class

Use

Tree

Deprecated

Index

Help

PREV CLASS NEXT CLASS All Classes All Packages

FRAMES NO FRAMES

FlexDoc/Javadoc 2.0
Demo Java Doc

Java API documentation generated with FlexDoc/Javadoc 2.0 using JavadocClassic 3.0 template set.

FlexDoc/Javadoc is a template-driven programming tool for rapid development of any Javadoc-based Java API documentation generators (i.e. doclets). If you need to customize your Javadoc without writing a full-blown doclet from scratch, FlexDoc/Javadoc may be the only tool able to help you! Find out more at www.flexdoc.xyz

Constructor Summary
InputStreamReader(InputStream in) Creates an InputStreamReader that uses the default charset.
InputStreamReader(InputStream in, Charset cs) Creates an InputStreamReader that uses the given charset.
InputStreamReader(InputStream in, CharsetDecoder dec) Creates an InputStreamReader that uses the given charset decoder.
InputStreamReader(InputStream in, String charsetName) Creates an InputStreamReader that uses the named charset.

Method Summary
void	close() Closes the stream and releases any system resources associated with it.
String	getEncoding() Returns the name of the character encoding being used by this stream.
int	read() Reads a single character.
int	read(char[] cbuf, int off, int len) Reads characters into a portion of an array.
int	read(CharBuffer target) Attempts to read characters into the specified character buffer.
boolean	ready() Tells whether this stream is ready to be read.

public InputStreamReader	(InputStream in, String charsetName)
throws	UnsupportedEncodingException