利用NIO的Selector处理服务器-客户端模型
package NIOTEST; import java.io.IOException; import java.net.InetAddress; import java.net.InetSocketAddress; import java.nio.ByteBuffer; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; import java.util.Iterator; import java.util.Set; public class NIOServer { public static void main(String[] args) throws IOException, InterruptedException { Selector selector = Selector.open(); ServerSocketChannel serverSocketChannel = ServerSocketChannel.open(); InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(), 8080); serverSocketChannel.socket().bind(address); serverSocketChannel.configureBlocking(false); serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT); while (true) { if (selector.select() > 0) { Set<SelectionKey> selectionKeys = selector.selectedKeys(); Iterator<SelectionKey> it = selectionKeys.iterator(); while (it.hasNext()) { SelectionKey selectionKey = it.next(); if (selectionKey.isAcceptable()) { serverSocketChannel = (ServerSocketChannel)selectionKey.channel(); SocketChannel socketChannel = serverSocketChannel.accept(); socketChannel.configureBlocking(false); socketChannel.register(selector, SelectionKey.OP_READ); System.out.println("Connected: " + socketChannel.socket().getRemoteSocketAddress()); } else if (selectionKey.isReadable()) { SocketChannel socketChannel = (SocketChannel) selectionKey.channel(); ByteBuffer buffer = ByteBuffer.allocate(1024); while (socketChannel.read(buffer) > 0) { buffer.flip(); byte[] dis = new byte[buffer.limit()]; buffer.get(dis); System.out.println("当前线程="+Thread.currentThread().getId()+"--"+new String(dis)); } } it.remove(); } } Thread.sleep(100); } } }
客户端
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package NIOTEST; import java.io.IOException; import java.net.InetAddress; import java.net.InetSocketAddress; import java.nio.ByteBuffer; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Iterator; import java.util.Set; public class NIOClient { public static void main(String[] args) throws IOException { SocketChannel socketChannel = SocketChannel.open(); InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(), 8080); socketChannel.socket().connect(address); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); ByteBuffer buffer = ByteBuffer.allocate(1024); while (true) { try { buffer.clear(); String time = sdf.format(new Date()); buffer.put(time.getBytes()); buffer.flip(); socketChannel.write(buffer); Thread.sleep(5000); } catch (Exception e) { System.out.println("Connection Close"); break; } } } }