Java nio Client端简单示例

java nio是一种基于Channel、Selector、Buffer的技术，它是一种非阻塞的IO实现方式

以下Client端示例

public class ClientNio {

	public static void main(String[] args) throws IOException, InterruptedException {
		SocketChannel socketChannel = SocketChannel.open();   //打开一个socket 通道
//        socketChannel.configureBlocking(false);

//		Selector selector = Selector.open();

//        socketChannel.register(selector, SelectionKey.OP_CONNECT);
		socketChannel.connect(new InetSocketAddress("127.0.0.1",8099)); //连接到server端8099端口

		ByteBuffer byteBuffer = ByteBuffer.allocate(4);   //开辟4个字节的内存
		byteBuffer.clear();
		int a = 222;

		try {
			byteBuffer.put((byte) (a >> 24));   //将4个字节从高位到低位分别放到byteBuffer中
			byteBuffer.put((byte) (a >> 16));
			byteBuffer.put((byte) (a >> 8));
			byteBuffer.put((byte) (a));
			byteBuffer.flip();  //切换写模式到读模式
			while (byteBuffer.hasRemaining()) {
				socketChannel.write(byteBuffer);  //写入通道中，服务端可接受这些信息
			}
//            socketChannel.shutdownInput();
		}finally {
			socketChannel.close();
		}
		Thread.sleep(5000);

		System.out.println("exit");
	}

}