Class java.io.InputStreamReader - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.io.InputStreamReader

java.lang.Object
   |
   +----java.io.Reader
           |
           +----java.io.InputStreamReader

public class InputStreamReader
extends Reader

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and translates them into characters according to a specified character encoding. The encoding that it uses may be specified by name, or the platform's default encoding 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. For top efficiency, consider wrapping an InputStreamReader within a BufferedReader; for example,

 BufferedReader in
   = new BufferedReader(new InputStreamReader(System.in));

See Also:: BufferedReader, InputStream

InputStreamReader(InputStream): Create an InputStreamReader that uses the default character encoding.
InputStreamReader(InputStream, String): Create an InputStreamReader that uses the named character encoding.

close(): Close the stream.
getEncoding(): Return the name of the encoding being used by this stream.
read(): Read a single character.
read(char[], int, int): Read characters into a portion of an array.
ready(): Tell whether this stream is ready to be read.

InputStreamReader

 public InputStreamReader(InputStream in)

Create an InputStreamReader that uses the default character encoding.

Parameters:: in - An InputStream

InputStreamReader

 public InputStreamReader(InputStream in,
                          String enc) throws UnsupportedEncodingException

Create an InputStreamReader that uses the named character encoding.

Parameters:: in - An InputStream; enc - Name of encoding to be used
Throws: UnsupportedEncodingException: If the named encoding is not supported

getEncoding

 public String getEncoding()

Return the name of the encoding being used by this stream. May return null if the stream has been closed.

read

 public int read() throws IOException

Read a single character.

Returns:: The character read, or -1 if the end of the stream has been reached
Throws: IOException: If an I/O error occurs
Overrides:: read in class Reader

read

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

Read characters into a portion of an array.

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: IOException: If an I/O error occurs
Overrides:: read in class Reader

ready

 public boolean ready() throws IOException

Tell 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.

Throws: IOException: If an I/O error occurs
Overrides:: ready in class Reader

close

 public void close() throws IOException

Close the stream.

Throws: IOException: If an I/O error occurs
Overrides:: close in class Reader

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Submit a bug or feature - Version 1.1.8 of Java Platform API Specification
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries.
Copyright 1995-1999 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.