Java中channel用法總結

Java中channel用法總結。本站提示廣大學習愛好者：（Java中channel用法總結）文章只能為提供參考，不一定能成為您想要的結果。以下是Java中channel用法總結正文

本文實例總結了Java中channel用法。分享給年夜家供年夜家參考。詳細剖析以下：

1.Channel接口的界說：

public interface Channel
{
  public boolean isOpen( );
  public void close( ) throws IOException;
}

2.Channel的罕見類型：

FileChannel, SocketChannel, ServerSocketChannel, and DatagramChannel；
FileChannel經由過程RandomAccessFile, FileInputStream, FileOutputStream的getChannel()來初始化。

SocketChannel sc = SocketChannel.open();
sc.connect (new InetSocketAddress ("somehost", someport));
ServerSocketChannel ssc = ServerSocketChannel.open( );
ssc.socket().bind (new InetSocketAddress (somelocalport));
DatagramChannel dc = DatagramChannel.open();

3.Scatter/Gather，必需應用ByteBuffer.allocateDirect(100)

public interface ScatteringByteChannel extends ReadableByteChannel {
  public long read (ByteBuffer [] dsts) throws IOException;
  public long read (ByteBuffer [] dsts, int offset, int length) throws IOException;
}
public interface GatheringByteChannel extends WritableByteChannel {
  public long write(ByteBuffer[] srcs) throws IOException;
  public long write(ByteBuffer[] srcs, int offset, int length) throws IOException;
}

4.file lock是和file相干，而不是channel。可以對過程有用，而不是線程。可以經由過程內存映照文件(memory-mapped file)來完成線程同步

5.buffer = fileChannel.map (FileChannel.MapMode.READ_ONLY, 100, 200);

6.MappedByteBuffer are direct. load( )將全部文件加載到內存（改辦法不克不及包管完成）。force( )將數據flush到硬盤。

7.未綁定端口的DatagramChannel體系會主動分派端口。DatagramChannel的connect()，將包管只接收指定源地址的數據包。這時候候，可使用通俗的read和write辦法，包含Scatter/Gather

願望本文所述對年夜家的java法式設計有所贊助。