java nio selector的使用

来源：互联网发布：炫光软件编辑：程序博客网时间：2024/09/21 09:26

在继续深入netty之前，还是补习一下java的selector的使用吧，没想到java里面用起来跟epoll什么的也差不太多。。。

好吧，废话少说，直接上代码了，反正也比较的简单，也就不细说了。。。。。

package fjs;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;public class Fjs {/** * @param args * @throws IOException  */public static void main(String[] args) throws IOException {// TODO Auto-generated method stubSelector sel = Selector.open();ServerSocketChannel sc = ServerSocketChannel.open();sc.configureBlocking(false);sc.socket().bind(new InetSocketAddress(8000));sc.register(sel, SelectionKey.OP_ACCEPT);   //相当于是注册selector，并且注册事件是accept事件while (true) {sel.select();Iterator<SelectionKey> ki = sel.selectedKeys().iterator(); //用于遍历所有产生的事件while (ki.hasNext()) {SelectionKey key = ki.next();if (key.isAcceptable()) {ServerSocketChannel channel = (ServerSocketChannel) key.channel();SocketChannel ss = channel.accept();if (ss != null) {ss.configureBlocking(false);ss.register(sel, SelectionKey.OP_READ);}}if (key.isReadable()) {ByteBuffer buffer = ByteBuffer.allocate(1024);SocketChannel socketChannel = (SocketChannel) key.channel();socketChannel.read(buffer);buffer.flip();while (buffer.hasRemaining())System.out.print((char)buffer.get());socketChannel.register(sel, SelectionKey.OP_WRITE);} if (key.isWritable()) {SocketChannel ch = (SocketChannel) key.channel();ByteBuffer buff = ByteBuffer.wrap("hello world".getBytes());ch.write(buff);ch.close();}}}}}