java的selector用法

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对于java的NIO我不是很了解，正在学习中，以下是一个例子，可以读取telnet的输入

package com.test.nio;import java.io.DataInputStream;import java.io.InputStream;import java.net.InetSocketAddress;import java.net.Socket;import java.nio.channels.SelectionKey;import java.nio.channels.Selector;import java.nio.channels.ServerSocketChannel;import java.nio.channels.spi.SelectorProvider;import java.util.Iterator;import java.util.Set;public class TestSelector {/** * @param args * @throws Exception  */public static void main(String[] args) throws Exception {// TODO Auto-generated method stubSelector selector=SelectorProvider.provider().openSelector();ServerSocketChannel ssc= ServerSocketChannel.open();ssc.configureBlocking(false);ssc.socket().bind(new InetSocketAddress("127.0.0.1",7979));SelectionKey acceptKey=ssc.register(selector,SelectionKey.OP_ACCEPT);//System.out.println("通道就绪个数："+selector.select());int keysAdded=0;while((keysAdded=selector.select())>0){Set readyKeys=selector.selectedKeys();Iterator i=readyKeys.iterator();while(i.hasNext()){SelectionKey sk=(SelectionKey) i.next();i.remove();ServerSocketChannel nextReady= (ServerSocketChannel) sk.channel();Socket s=nextReady.accept().socket();InputStream din=s.getInputStream();DataInputStream ds=new DataInputStream(din);String str=ds.readLine();while(str!=null){System.out.println(str);str=ds.readLine();}}}}}

使用telnet连接上，输入字符回车，可以在控制台上看到输出

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