Java NIO 初学 javanio

刚开始学习java nio开发，写了个简单的例子，使用NIO 实现阻塞的发送接收数据，但是发现客户端一直没有接受到数据：

@Test
	public void Server() throws IOException{
		ServerSocketChannel sChannel = ServerSocketChannel.open();
		sChannel.bind(new InetSocketAddress(9010));
		ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
		String msg = "abcdef21a下小";
		System.out.println(msg.getBytes().length);
		byteBuffer.put(msg.getBytes());
		System.out.println("存数据:capacity:"+byteBuffer.capacity());
		System.out.println("存数据:limit:"+byteBuffer.limit());
		System.out.println("存数据:position:"+byteBuffer.position());
		System.out.println("服务端已启动，等待客户端连接");
		SocketChannel channel = sChannel.accept();
		System.out.println("客户端已连接，开始发送数据");
		byteBuffer.flip();
		channel.write(byteBuffer);
		channel.close();
		sChannel.close();
	}

@Test
	public void client() throws IOException{
		SocketChannel channel = SocketChannel.open();
		channel.connect(new InetSocketAddress("localhost", 9010));
		ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
		System.out.println("客户端启动，连接上服务端，准备接受数据");
		int p =0;
		while((p=channel.read(byteBuffer))!=-1){
			System.out.println("读了几个:"+p);
			System.out.println("读后:capacity:"+byteBuffer.capacity());
			System.out.println("读后:limit:"+byteBuffer.limit());
			System.out.println("读后:position:"+byteBuffer.position());
			System.out.println("读后:remaining:"+byteBuffer.remaining());
			byteBuffer.flip();
			byte[] bts = new byte[byteBuffer.remaining()];
			byteBuffer.get(bts);
			System.out.println("客户端接收到数据:"+new String(bts));
			byteBuffer.clear();
		}
		
		
		channel.close();
	}
	

只是简单的学习，代码比较简单，当在服务端和客户端加了对应的byteBuffer.filp()之后，才能实
现服务端发送与客户端接收，其中原理，这个例子主要是立即ByteBuffer的3个重要的标识，limit、
capacity、position （限制大小，容量，当前位置），新建ByteBuffer时 limit与capacity一样，
positon=0，当使用put放入数据时