一个基于AIO实现的简单web服务器

来源：互联网发布：招商银行数据分析编辑：程序博客网时间：2024/04/30 20:40

一下是一个基于AIO实现的简单web服务器，这是一个简单例子

/** * 一个简单的web 服务器<br/> * 通过浏览器输入localhost:8080/访问 *  * @author Joeson * @since 2014/05 *  */public class AioServer implements Runnable{private AsynchronousChannelGroup asyncChannelGroup;private AsynchronousServerSocketChannel server;public AioServer(int port) throws Exception{// 创建线程池ExecutorService executor = Executors.newFixedThreadPool(20);// 异步通道管理器asyncChannelGroup = AsynchronousChannelGroup.withThreadPool(executor);// 创建 用在服务端的异步Socket.以下简称服务器socket。// 异步通道管理器，会把服务端所用到的相关参数server = AsynchronousServerSocketChannel.open(asyncChannelGroup).bind(new InetSocketAddress(port));}public void run(){try{// 为服务端socket指定接收操作对象.accept原型是：// accept(A attachment, CompletionHandler<AsynchronousSocketChannel,// ? super A> handler)// 也就是这里的CompletionHandler的A型参数是实际调用accept方法的第一个参数// 即是listener。另一个参数V，就是原型中的客户端socketserver.accept(server,new CompletionHandler<AsynchronousSocketChannel, AsynchronousServerSocketChannel>(){String str = "<html><head><title>test</title></head><body><p>this is a socketserver test</p></body></html>";String CRLF = "\r\n";// 响应头的参数String serverLine = "Server:a simple java WebServer";String statusLine = "HTTP/1.1 200 OK" + CRLF;String contentTypeLine = "Content-type:text/html"+ CRLF;String contentLengthLine = "Content-Length:" + str.length()+ CRLF;@Overridepublic void completed(AsynchronousSocketChannel result,AsynchronousServerSocketChannel attachment){// TODO Auto-generated method stub// writeChannel(result, statusLine);// writeChannel(result, serverLine);// writeChannel(result, contentTypeLine);// writeChannel(result, contentLengthLine);// writeChannel(result, CRLF);writeChannel(result, statusLine + serverLine+ contentTypeLine + contentLengthLine+ CRLF + str);// writeChannel(result, str);try{result.shutdownOutput();result.shutdownInput();} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}try{result.close();} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}attachment.accept(attachment, this);}@Overridepublic void failed(Throwable exc,AsynchronousServerSocketChannel attachment){// TODO Auto-generated method stub}public void writeChannel(AsynchronousSocketChannel channel, String s){Future<Integer> future = channel.write(ByteBuffer.wrap(s.getBytes()));try{future.get();} catch (InterruptedException e){// TODO Auto-generated catch blocke.printStackTrace();} catch (ExecutionException e){// TODO Auto-generated catch blocke.printStackTrace();}}});Thread.sleep(400000);} catch (Exception e){e.printStackTrace();} finally{System.out.println("finished server");}}public static void main(String... args) throws Exception{AioServer server = new AioServer(8080);new Thread(server).start();}}

基于AIO实现的web服务器并发性能要比NIO以及Netty实现的服务器并发要高，这最主要的还是他是基于Proactor的IO处理模型，把读写操作转交右操作系统负责

(当然这里静态页面比较小，传输上比较节约时间，但不会有很大影响)

基于Netty以及NIO的实现的服务器并发可以达到每秒处理6-7以上千request，但是用AIO实现的话，那足可以上9000+（以我的机器为标注），而tomcat也这样的成品的产品也是9000左右而已，都是以静态相同页面为标注

不得不说，AIO的异步处理还是很强大的，不过可能在负载均衡处理控制上要比NIO差

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