AIO

AIO

AIO编程，在NIO基础上引入了异步通道的概念，并提供了异步文件和异步套接字通道的实现。从而在真正意义上实现了异步非阻塞，之前我们学习的NIO只是非阻塞而并非异步。而AIO它不需要通过多路复用器对注册的通道进行轮询操作即可实现异步读写，从而简化了NIO编程模型。也可以称之为NIO2.0，这种模式才真正属于我们异步非阻塞的模型。
AsynchronousServerSocketChannel
AsynchronousSocketChannel

Client.java

public class Client implements Runnable{    private AsynchronousSocketChannel asc;    public Client() throws IOException{        asc = AsynchronousSocketChannel.open();    }    public void connect(){        asc.connect(new InetSocketAddress("127.0.0.1",8765));    }    public void write(String request){        try {            asc.write(ByteBuffer.wrap(request.getBytes())).get();            read();        } catch (Exception e) {            e.printStackTrace();        }     }    public void read(){        try {            ByteBuffer buf = ByteBuffer.allocate(1024);            asc.read(buf).get();            buf.flip();            byte[] respByte = new byte[buf.remaining()];            buf.get(respByte);            System.out.println(new String(respByte).trim());        }catch (Exception e) {            e.printStackTrace();        }    }    @Override    public void run() {        while(true){        }    }    public static void main(String[] args) throws IOException, InterruptedException {        Client c1 = new Client();        c1.connect();        Client c2 = new Client();        c2.connect();        Client c3 = new Client();        c3.connect();        new Thread(c1,"c1").start();        new Thread(c2,"c2").start();        new Thread(c3,"c3").start();        Thread.sleep(1000);        c1.write("c1 aaa");        c2.write("c2 bbbb");        c3.write("c3 ccccc");    }}

Server.java

public class Server {    //线程池    private ExecutorService executorService;    //线程组    private AsynchronousChannelGroup threadGroup;    //服务器通道    public AsynchronousServerSocketChannel assc;    public Server(int port) {        try {            //创建一个缓冲池            executorService = Executors.newCachedThreadPool();            //创建线程组            threadGroup = AsynchronousChannelGroup.withCachedThreadPool(executorService, 1);            //创建服务器通道            assc = AsynchronousServerSocketChannel.open(threadGroup);            //进行绑定            assc.bind(new InetSocketAddress(port));            System.out.println("server start，port："+port);            //进行阻塞            assc.accept(this,new ServerCompletionHandler());            //一直阻塞 不让服务器停止            Thread.sleep(Integer.MAX_VALUE);        } catch (Exception e) {            e.printStackTrace();        }     }    public static void main(String[] args) {        Server server = new Server(8765);    }}

ServerCompletionHandler.java

public class ServerCompletionHandler implements CompletionHandler<AsynchronousSocketChannel,Server> {    @Override    public void completed(AsynchronousSocketChannel asc, Server attachment) {        //当有下一个客户端接入的时候直接调用Server的accept方法，这样反复执行下去，保证多个客户端可以阻塞//      attachment.assc.accept(attachment,this);        read(asc);    }    @Override    public void failed(Throwable exc, Server attachment) {        exc.printStackTrace();    }    private void read(final AsynchronousSocketChannel asc){        //读取数据        ByteBuffer buf = ByteBuffer.allocate(1024);        asc.read(buf,buf,new CompletionHandler<Integer, ByteBuffer>() {            @Override            public void completed(Integer resultSize, ByteBuffer attachment) {                //进行读取之后，重置标志位                attachment.flip();                //获取读取的字节数                System.out.println("Server-->收到客户端的数据长度为："+resultSize);                //获取读取的数据                String resultData = new String(attachment.array()).trim();                System.out.println("Server-->收到客户端的数据信息为："+resultData);                String response = "服务器响应，收到客户端发来的数据："+resultData;                write(asc,response);            }            @Override            public void failed(Throwable exc, ByteBuffer attachment) {                exc.printStackTrace();                          }        });    }    public void write(AsynchronousSocketChannel asc,String response){        try {            ByteBuffer buf = ByteBuffer.allocate(1024);            buf.put(response.getBytes());            buf.flip();            asc.write(buf).get();        } catch (Exception e) {            e.printStackTrace();        }    }}