SocketChannel在java中如何实现客户端
这篇文章主要介绍“SocketChannel在java中如何实现客户端”,在日常操作中,相信很多人在SocketChannel在java中如何实现客户端问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”SocketChannel在java中如何实现客户端”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
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1、步骤
(1)创建SocketChannel实例,并将其配置为非阻塞模式,只有在SocketChannel实例中,任何I/O操作都是非阻塞的。
(2)使用connect()方法连接服务器,同时使用while循环连续检测和完全连接。在需要立即进行I/O操作之前,必须使用finishConnect()来完成连接过程。
(3)用ByteBuffer读写字节,假如SelectableChannel是一种非阻塞模式,那么它的I/O操作读写字节可能比实际字节少,甚至没有。因此,我们使用循环连续的读写来确保读写完成。
2、实例
public class NonBlockingTCPClient { public static void main(String[] args) { byte[] data = "hello".getBytes(); SocketChannel channel = null; try { // 1. open a socket channel channel = SocketChannel.open(); // adjust to be nonblocking channel.configureBlocking(false); // 2. init connection to server and repeatedly poll with complete // connect() and finishConnect() are nonblocking operation, both return immediately if (!channel.connect(new InetSocketAddress(InetAddress.getLocalHost(), 8899))) { while (!channel.finishConnect()) { System.out.print("."); } } System.out.println("Connected to server..."); ByteBuffer writeBuffer = ByteBuffer.wrap(data); ByteBuffer readBuffer = ByteBuffer.allocate(data.length); int totalBytesReceived = 0; int bytesReceived; // 3. read and write bytes while (totalBytesReceived < data.length) { if (writeBuffer.hasRemaining()) { channel.write(writeBuffer); } if ((bytesReceived = channel.read(readBuffer)) == -1) { throw new SocketException("Connection closed prematurely"); } totalBytesReceived += bytesReceived; System.out.print("."); } System.out.println("Server said: " + new String(readBuffer.array())); } catch (IOException e) { e.printStackTrace(); } finally { // 4 .close socket channel try { if (channel != null) { channel.close(); } } catch (IOException e) { e.printStackTrace(); } } } }
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