public class TimeServer { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { int port = 8080; if (args != null && args.length > 0) { try { port = Integer.valueOf(args[0]); } catch (NumberFormatException e) { // 采用默认值 } } MultiplexerTimeServer timeServer = new MultiplexerTimeServer(port); new Thread(timeServer, "NIO-MultiplexerTimeServer-001").start(); }}
public class MultiplexerTimeServer implements Runnable { private Selector selector; private ServerSocketChannel servChannel; private volatile boolean stop; /** * 初始化多路复用器、绑定监听端口 * * @param port */ public MultiplexerTimeServer(int port) { try { selector = Selector.open(); servChannel = ServerSocketChannel.open(); servChannel.configureBlocking(false); servChannel.socket().bind(new InetSocketAddress(port), 1024); servChannel.register(selector, SelectionKey.OP_ACCEPT); System.out.println("The time server is start in port : " + port); } catch (IOException e) { e.printStackTrace(); System.exit(1); } } public void stop() { this.stop = true; } /* * (non-Javadoc) * * @see java.lang.Runnable#run() */ @Override public void run() { while (!stop) { try { selector.select(1000); SetselectedKeys = selector.selectedKeys(); Iterator it = selectedKeys.iterator(); SelectionKey key = null; while (it.hasNext()) { key = it.next(); it.remove(); try { handleInput(key); } catch (Exception e) { if (key != null) { key.cancel(); if (key.channel() != null) key.channel().close(); } } } } catch (Throwable t) { t.printStackTrace(); } } // 多路复用器关闭后,所有注册在上面的Channel和Pipe等资源都会被自动去注册并关闭,所以不需要重复释放资源 if (selector != null) try { selector.close(); } catch (IOException e) { e.printStackTrace(); } } private void handleInput(SelectionKey key) throws IOException { if (key.isValid()) { // 处理新接入的请求消息 if (key.isAcceptable()) { // Accept the new connection ServerSocketChannel ssc = (ServerSocketChannel) key.channel(); SocketChannel sc = ssc.accept(); sc.configureBlocking(false); // Add the new connection to the selector sc.register(selector, SelectionKey.OP_READ); } if (key.isReadable()) { // Read the data SocketChannel sc = (SocketChannel) key.channel(); ByteBuffer readBuffer = ByteBuffer.allocate(1024); int readBytes = sc.read(readBuffer); if (readBytes > 0) { readBuffer.flip(); byte[] bytes = new byte[readBuffer.remaining()]; readBuffer.get(bytes); String body = new String(bytes, "UTF-8"); System.out.println("The time server receive order : " + body); String currentTime = "QUERY TIME ORDER" .equalsIgnoreCase(body) ? new java.util.Date( System.currentTimeMillis()).toString() : "BAD ORDER"; doWrite(sc, currentTime); } else if (readBytes < 0) { // 对端链路关闭 key.cancel(); sc.close(); } else ; // 读到0字节,忽略 } } } private void doWrite(SocketChannel channel, String response) throws IOException { if (response != null && response.trim().length() > 0) { byte[] bytes = response.getBytes(); ByteBuffer writeBuffer = ByteBuffer.allocate(bytes.length); writeBuffer.put(bytes); writeBuffer.flip(); channel.write(writeBuffer); } }}
public class TimeClient { /** * @param args */ public static void main(String[] args) { int port = 8080; if (args != null && args.length > 0) { try { port = Integer.valueOf(args[0]); } catch (NumberFormatException e) { // 采用默认值 } } new Thread(new TimeClientHandle("127.0.0.1", port), "TimeClient-001") .start(); }}
public class TimeClientHandle implements Runnable { private String host; private int port; private Selector selector; private SocketChannel socketChannel; private volatile boolean stop; public TimeClientHandle(String host, int port) { this.host = host == null ? "127.0.0.1" : host; this.port = port; try { selector = Selector.open(); socketChannel = SocketChannel.open(); socketChannel.configureBlocking(false); } catch (IOException e) { e.printStackTrace(); System.exit(1); } } /* * (non-Javadoc) * * @see java.lang.Runnable#run() */ @Override public void run() { try { doConnect(); } catch (IOException e) { e.printStackTrace(); System.exit(1); } while (!stop) { try { selector.select(1000); SetselectedKeys = selector.selectedKeys(); Iterator it = selectedKeys.iterator(); SelectionKey key = null; while (it.hasNext()) { key = it.next(); it.remove(); try { handleInput(key); } catch (Exception e) { if (key != null) { key.cancel(); if (key.channel() != null) key.channel().close(); } } } } catch (Exception e) { e.printStackTrace(); System.exit(1); } } // 多路复用器关闭后,所有注册在上面的Channel和Pipe等资源都会被自动去注册并关闭,所以不需要重复释放资源 if (selector != null) try { selector.close(); } catch (IOException e) { e.printStackTrace(); } } private void handleInput(SelectionKey key) throws IOException { if (key.isValid()) { // 判断是否连接成功 SocketChannel sc = (SocketChannel) key.channel(); if (key.isConnectable()) { if (sc.finishConnect()) { sc.register(selector, SelectionKey.OP_READ); doWrite(sc); } else System.exit(1);// 连接失败,进程退出 } if (key.isReadable()) { ByteBuffer readBuffer = ByteBuffer.allocate(1024); int readBytes = sc.read(readBuffer); if (readBytes > 0) { readBuffer.flip(); byte[] bytes = new byte[readBuffer.remaining()]; readBuffer.get(bytes); String body = new String(bytes, "UTF-8"); System.out.println("Now is : " + body); this.stop = true; } else if (readBytes < 0) { // 对端链路关闭 key.cancel(); sc.close(); } else ; // 读到0字节,忽略 } } } private void doConnect() throws IOException { // 如果直接连接成功,则注册到多路复用器上,发送请求消息,读应答 if (socketChannel.connect(new InetSocketAddress(host, port))) { socketChannel.register(selector, SelectionKey.OP_READ); doWrite(socketChannel); } else socketChannel.register(selector, SelectionKey.OP_CONNECT); } private void doWrite(SocketChannel sc) throws IOException { byte[] req = "QUERY TIME ORDER".getBytes(); ByteBuffer writeBuffer = ByteBuffer.allocate(req.length); writeBuffer.put(req); writeBuffer.flip(); sc.write(writeBuffer); if (!writeBuffer.hasRemaining()) System.out.println("Send order 2 server succeed."); }}