NIO的工作方式（一）

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package com.yyj.nio;import java.io.IOException;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 NIODemo {public void selector() throws IOException{ByteBuffer buffer = ByteBuffer.allocate(1024); //定义一个缓冲区数组长度为1024//打开选择器Selector selector = Selector.open();ServerSocketChannel ssc = ServerSocketChannel.open();ssc.configureBlocking(false);//设置为非阻塞方式ssc.socket().bind(new InetSocketAddress(8080));ssc.register(selector, SelectionKey.OP_ACCEPT); //注册监听事件while(true){Set selectedKeys = selector.selectedKeys();//取得所有key集合Iterator it =  selectedKeys.iterator();while(it.hasNext()){SelectionKey key = (SelectionKey) it.next();if((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT){ServerSocketChannel ssChannel = (ServerSocketChannel) key.channel();SocketChannel sc = ssChannel.accept();sc.configureBlocking(false);sc.register(selector, SelectionKey.OP_READ);it.remove();}else if((key.readyOps() & SelectionKey.OP_READ)  == SelectionKey.OP_READ){SocketChannel sc = (SocketChannel) key.channel();while(true){buffer.clear();int n = sc.read(buffer);if(n<0){break;}buffer.flip();}it.remove();}}}}}
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