java SocketChannel and ServerSocketChannel

1 SocketChannel

1.1 打开一个SocketChannel

SocketChannel socketChannel = SocketChannel.open();

socketChannel.connect(new InetSocketAddress("http://www.baidu.com", 80));

1.2 关闭一个SocketChannel

socketChannel.close();

1.3 读取一个SocketChannel

ByteBuffer buf = ByteBuffer.allocate(48);

int byteRead = socketChannel.read(buf);

2 ServerSocketChannel

2.1 ServerSocketChannel in blocking mode

    ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

    serverSocketChannel.socket().bind(new InetSocketAddress(1111));

    while(true) {

        SocketChannel socketChannel = serverSocketChannel.accept();

        // do something with socketChannel.......

    }

2.2 ServerSocketChannel in non-blocking mode

    ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

    serverSocketChannel.socket().bind(new InetSocketAddress(1111));

    serverSocketChannel.configureBlocking(false);

    while(true) {

        SocketChannel socketChannel = serverSocketChannel.accept();

        if (socketChannel != null)

        {

            // do something with socketChannel.......

        }

    }

在non-blocking mode时，没有人来connect的时候accept()就会直接返回。这也是non-blocking的意义所在，对于文件而言，总是可以读写的，不存在block一说，也就没有non-blocking mode了。