Channels (Java Platform SE 8 )

java.lang.Object
- java.nio.channels.Channels

```
public final class Channels
extends Object
```
Utility methods for channels and streams.
This class defines static methods that support the interoperation of the stream classes of the java.io package with the channel classes of this package.

Since:

1.4

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static ReadableByteChannel`	`newChannel(InputStream in)` Constructs a channel that reads bytes from the given stream.
`static WritableByteChannel`	`newChannel(OutputStream out)` Constructs a channel that writes bytes to the given stream.
`static InputStream`	`newInputStream(AsynchronousByteChannel ch)` Constructs a stream that reads bytes from the given channel.
`static InputStream`	`newInputStream(ReadableByteChannel ch)` Constructs a stream that reads bytes from the given channel.
`static OutputStream`	`newOutputStream(AsynchronousByteChannel ch)` Constructs a stream that writes bytes to the given channel.
`static OutputStream`	`newOutputStream(WritableByteChannel ch)` Constructs a stream that writes bytes to the given channel.
`static Reader`	`newReader(ReadableByteChannel ch, CharsetDecoder dec, int minBufferCap)` Constructs a reader that decodes bytes from the given channel using the given decoder.
`static Reader`	`newReader(ReadableByteChannel ch, String csName)` Constructs a reader that decodes bytes from the given channel according to the named charset.
`static Writer`	`newWriter(WritableByteChannel ch, CharsetEncoder enc, int minBufferCap)` Constructs a writer that encodes characters using the given encoder and writes the resulting bytes to the given channel.
`static Writer`	`newWriter(WritableByteChannel ch, String csName)` Constructs a writer that encodes characters according to the named charset and writes the resulting bytes to the given channel.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - newInputStream
```
public static InputStream newInputStream(ReadableByteChannel ch)
```
    Constructs a stream that reads bytes from the given channel.
    The read methods of the resulting stream will throw an IllegalBlockingModeException if invoked while the underlying channel is in non-blocking mode. The stream will not be buffered, and it will not support the mark or reset methods. The stream will be safe for access by multiple concurrent threads. Closing the stream will in turn cause the channel to be closed.
    
    Parameters:
    
    ch - The channel from which bytes will be read
    
    Returns:
    
    A new input stream
  - newOutputStream
```
public static OutputStream newOutputStream(WritableByteChannel ch)
```
    Constructs a stream that writes bytes to the given channel.
    The write methods of the resulting stream will throw an IllegalBlockingModeException if invoked while the underlying channel is in non-blocking mode. The stream will not be buffered. The stream will be safe for access by multiple concurrent threads. Closing the stream will in turn cause the channel to be closed.
    
    Parameters:
    
    ch - The channel to which bytes will be written
    
    Returns:
    
    A new output stream
  - newInputStream
```
public static InputStream newInputStream(AsynchronousByteChannel ch)
```
    Constructs a stream that reads bytes from the given channel.
    The stream will not be buffered, and it will not support the mark or reset methods. The stream will be safe for access by multiple concurrent threads. Closing the stream will in turn cause the channel to be closed.
    
    Parameters:
    
    ch - The channel from which bytes will be read
    
    Returns:
    
    A new input stream
    
    Since:
    
    1.7
  - newOutputStream
```
public static OutputStream newOutputStream(AsynchronousByteChannel ch)
```
    Constructs a stream that writes bytes to the given channel.
    The stream will not be buffered. The stream will be safe for access by multiple concurrent threads. Closing the stream will in turn cause the channel to be closed.
    
    Parameters:
    
    ch - The channel to which bytes will be written
    
    Returns:
    
    A new output stream
    
    Since:
    
    1.7
  - newChannel
```
public static ReadableByteChannel newChannel(InputStream in)
```
    Constructs a channel that reads bytes from the given stream.
    The resulting channel will not be buffered; it will simply redirect its I/O operations to the given stream. Closing the channel will in turn cause the stream to be closed.
    
    Parameters:
    
    in - The stream from which bytes are to be read
    
    Returns:
    
    A new readable byte channel
  - newChannel
```
public static WritableByteChannel newChannel(OutputStream out)
```
    Constructs a channel that writes bytes to the given stream.
    The resulting channel will not be buffered; it will simply redirect its I/O operations to the given stream. Closing the channel will in turn cause the stream to be closed.
    
    Parameters:
    
    out - The stream to which bytes are to be written
    
    Returns:
    
    A new writable byte channel
  - newReader
```
public static Reader newReader(ReadableByteChannel ch,
                               CharsetDecoder dec,
                               int minBufferCap)
```
    Constructs a reader that decodes bytes from the given channel using the given decoder.
    The resulting stream will contain an internal input buffer of at least minBufferCap bytes. The stream's read methods will, as needed, fill the buffer by reading bytes from the underlying channel; if the channel is in non-blocking mode when bytes are to be read then an IllegalBlockingModeException will be thrown. The resulting stream will not otherwise be buffered, and it will not support the mark or reset methods. Closing the stream will in turn cause the channel to be closed.
    
    Parameters:
    
    ch - The channel from which bytes will be read
    
    dec - The charset decoder to be used
    
    minBufferCap - The minimum capacity of the internal byte buffer, or -1 if an implementation-dependent default capacity is to be used
    
    Returns:
    
    A new reader
  - newReader
```
public static Reader newReader(ReadableByteChannel ch,
                               String csName)
```
    Constructs a reader that decodes bytes from the given channel according to the named charset.
    An invocation of this method of the form
    Channels.newReader(ch, csname)
    behaves in exactly the same way as the expression
    Channels.newReader(ch, Charset.forName(csName) .newDecoder(), -1);
    Parameters:
    
    ch - The channel from which bytes will be read
    
    csName - The name of the charset to be used
    
    Returns:
    
    A new reader
    
    Throws:
    
    UnsupportedCharsetException - If no support for the named charset is available in this instance of the Java virtual machine
  - newWriter
```
public static Writer newWriter(WritableByteChannel ch,
                               CharsetEncoder enc,
                               int minBufferCap)
```
    Constructs a writer that encodes characters using the given encoder and writes the resulting bytes to the given channel.
    The resulting stream will contain an internal output buffer of at least minBufferCap bytes. The stream's write methods will, as needed, flush the buffer by writing bytes to the underlying channel; if the channel is in non-blocking mode when bytes are to be written then an IllegalBlockingModeException will be thrown. The resulting stream will not otherwise be buffered. Closing the stream will in turn cause the channel to be closed.
    
    Parameters:
    
    ch - The channel to which bytes will be written
    
    enc - The charset encoder to be used
    
    minBufferCap - The minimum capacity of the internal byte buffer, or -1 if an implementation-dependent default capacity is to be used
    
    Returns:
    
    A new writer
  - newWriter
```
public static Writer newWriter(WritableByteChannel ch,
                               String csName)
```
    Constructs a writer that encodes characters according to the named charset and writes the resulting bytes to the given channel.
    An invocation of this method of the form
    Channels.newWriter(ch, csname)
    behaves in exactly the same way as the expression
    Channels.newWriter(ch, Charset.forName(csName) .newEncoder(), -1);
    Parameters:
    
    ch - The channel to which bytes will be written
    
    csName - The name of the charset to be used
    
    Returns:
    
    A new writer
    
    Throws:
    
    UnsupportedCharsetException - If no support for the named charset is available in this instance of the Java virtual machine

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Class Channels

Method Summary

Methods inherited from class java.lang.Object

Method Detail

newInputStream

newOutputStream

newInputStream

newOutputStream

newChannel

newChannel

newReader

newReader

newWriter

newWriter