Channels
public
final
class
Channels
extends Object
java.lang.Object | |
↳ | java.nio.channels.Channels |
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.
Summary
Public methods | |
---|---|
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(ReadableByteChannel ch)
Constructs a stream that reads bytes from the given channel. |
static
InputStream
|
newInputStream(AsynchronousByteChannel 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, Charset charset)
Constructs a reader that decodes bytes from the given channel according to the given charset. |
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, Charset charset)
Constructs a writer that encodes characters according to the given charset 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. |
Inherited methods | |
---|---|
Public methods
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 |
InputStream : The stream from which bytes are to be read |
Returns | |
---|---|
ReadableByteChannel |
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 |
OutputStream : The stream to which bytes are to be written |
Returns | |
---|---|
WritableByteChannel |
A new writable byte channel |
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 |
ReadableByteChannel : The channel from which bytes will be read |
Returns | |
---|---|
InputStream |
A new input 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 |
AsynchronousByteChannel : The channel from which bytes will be read |
Returns | |
---|---|
InputStream |
A new input stream |
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 |
AsynchronousByteChannel : The channel to which bytes will be written |
Returns | |
---|---|
OutputStream |
A new output 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 |
WritableByteChannel : The channel to which bytes will be written |
Returns | |
---|---|
OutputStream |
A new output stream |
newReader
public static Reader newReader (ReadableByteChannel ch, Charset charset)
Constructs a reader that decodes bytes from the given channel according to the given charset.
An invocation of this method of the form
Channels.newReader(ch, charset)
Channels.newReader(ch, Charset.forName(csName).newDecoder(), -1)
The reader's default action for malformed-input and unmappable-character errors is to report them. When more control over the error handling is required, the constructor that takes a CharsetDecoder should be used.
Parameters | |
---|---|
ch |
ReadableByteChannel : The channel from which bytes will be read |
charset |
Charset : The charset to be used |
Returns | |
---|---|
Reader |
A new reader |
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 |
ReadableByteChannel : The channel from which bytes will be read |
dec |
CharsetDecoder : The charset decoder to be used |
minBufferCap |
int : The minimum capacity of the internal byte buffer,
or -1 if an implementation-dependent
default capacity is to be used |
Returns | |
---|---|
Reader |
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)
Channels.newReader(ch, Charset.forName(csName))
Parameters | |
---|---|
ch |
ReadableByteChannel : The channel from which bytes will be read |
csName |
String : The name of the charset to be used |
Returns | |
---|---|
Reader |
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 |
WritableByteChannel : The channel to which bytes will be written |
enc |
CharsetEncoder : The charset encoder to be used |
minBufferCap |
int : The minimum capacity of the internal byte buffer,
or -1 if an implementation-dependent
default capacity is to be used |
Returns | |
---|---|
Writer |
A new writer |
newWriter
public static Writer newWriter (WritableByteChannel ch, Charset charset)
Constructs a writer that encodes characters according to the given charset and writes the resulting bytes to the given channel.
An invocation of this method of the form
Channels.newWriter(ch, charset)
Channels.newWriter(ch, Charset.forName(csName).newEncoder(), -1)
The writer's default action for malformed-input and unmappable-character errors is to report them. When more control over the error handling is required, the constructor that takes a CharsetEncoder should be used.
Parameters | |
---|---|
ch |
WritableByteChannel : The channel to which bytes will be written |
charset |
Charset : The charset to be used |
Returns | |
---|---|
Writer |
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)
Channels.newWriter(ch, Charset.forName(csName))
Parameters | |
---|---|
ch |
WritableByteChannel : The channel to which bytes will be written |
csName |
String : The name of the charset to be used |
Returns | |
---|---|
Writer |
A new writer |
Throws | |
---|---|
UnsupportedCharsetException |
If no support for the named charset is available in this instance of the Java virtual machine |