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

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Class java.io.PipedInputStream

java.lang.Object
   |
   +----java.io.InputStream
           |
           +----java.io.PipedInputStream

public class PipedInputStream
extends InputStream

A piped input stream is the receiving end of a communications pipe. Two threads can communicate by having one thread send data through a piped output stream and having the other thread read the data through a piped input stream.

See Also:: PipedOutputStream

buffer: The circular buffer into which incoming data is placed.
in
out
PIPE_SIZE

PipedInputStream(): Creates a piped input stream that is not yet connected to a piped output stream.
PipedInputStream(PipedOutputStream): Creates a piped input stream connected to the specified piped output stream.

available(): Returns the number of bytes that can be read from this input stream without blocking.
close(): Closes this piped input stream and releases any system resources associated with the stream.
connect(PipedOutputStream): Connects this piped input stream to a sender.
read(): Reads the next byte of data from this piped input stream.
read(byte[], int, int): Reads up to len bytes of data from this piped input stream into an array of bytes.
receive(int): Receives a byte of data.

PIPE_SIZE

 protected static final int PIPE_SIZE

buffer

 protected byte buffer[]

The circular buffer into which incoming data is placed.

 protected int in

out

 protected int out

PipedInputStream

 public PipedInputStream(PipedOutputStream src) throws IOException

Creates a piped input stream connected to the specified piped output stream.

Parameters:: src - the stream to connect to.
Throws: IOException: if an I/O error occurs.

PipedInputStream

 public PipedInputStream()

Creates a piped input stream that is not yet connected to a piped output stream. It must be connected to a piped output stream, either by the receiver or the sender, before being used.

See Also:: connect, connect

connect

 public void connect(PipedOutputStream src) throws IOException

Connects this piped input stream to a sender.

Parameters:: src - The piped output stream to connect to.
Throws: IOException: if an I/O error occurs.

receive

 protected synchronized void receive(int b) throws IOException

Receives a byte of data. This method will block if no input is available.

Parameters:: b - the byte being received
Throws: IOException: If the pipe is broken.

read

 public synchronized int read() throws IOException

Reads the next byte of data from this piped input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because this end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Returns:: the next byte of data, or -1 if the end of the stream is reached.
Throws: IOException: if the pipe is broken.
Overrides:: read in class InputStream

read

 public synchronized int read(byte b[],
                              int off,
                              int len) throws IOException

Reads up to len bytes of data from this piped input stream into an array of bytes. This method blocks until at least one byte of input is available.

Parameters:: b - the buffer into which the data is read.; off - the start offset of the data.; len - the maximum number of bytes read.
Returns:: the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws: IOException: if an I/O error occurs.
Overrides:: read in class InputStream

available

 public synchronized int available() throws IOException

Returns the number of bytes that can be read from this input stream without blocking. This method overrides the available method of the parent class.

Returns:: the number of bytes that can be read from this input stream without blocking.
Throws: IOException: if an I/O error occurs.
Overrides:: available in class InputStream

close

 public void close() throws IOException

Closes this piped input stream and releases any system resources associated with the stream.

Throws: IOException: if an I/O error occurs.
Overrides:: close in class InputStream

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