netty下载

netty下载


package com.zzq.nio.reactor; 
 
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 Reactor implements Runnable { 
 
    private ServerSocketChannel serverSocketChannel = null; 
 
    private Selector            selector            = null; 
 
    public Reactor() { 
        try { 
            selector = Selector.open(); 
            serverSocketChannel = ServerSocketChannel.open(); 
            serverSocketChannel.configureBlocking(false); 
            serverSocketChannel.socket().bind(new InetSocketAddress(8888)); 
            SelectionKey selectionKey = serverSocketChannel.register(selector, 
                SelectionKey.OP_ACCEPT); 
            selectionKey.attach(new Acceptor()); 
            System.out.println("服务器启动正常!"); 
        } catch (IOException e) { 
            System.out.println("启动服务器时出现异常!"); 
            e.printStackTrace(); 
        } 
    } 
 
    public void run() { 
        while (true) { 
            try { 
                selector.select(); 
 
                Iterator<SelectionKey> iter = selector.selectedKeys().iterator(); 
                while (iter.hasNext()) { 
                    SelectionKey selectionKey = iter.next(); 
                    dispatch((Runnable) selectionKey.attachment()); 
                    iter.remove(); 
                } 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
 
    public void dispatch(Runnable runnable) { 
        if (runnable != null) { 
            runnable.run(); 
        } 
    } 
 
    public static void main(String[] args) { 
        new Thread(new Reactor()).start(); 
    } 
 
    class Acceptor implements Runnable { 
        public void run() { 
            try { 
                SocketChannel socketChannel = serverSocketChannel.accept(); 
                if (socketChannel != null) { 
                    System.out.println("接收到来自客户端（" 
                                       + socketChannel.socket().getInetAddress().getHostAddress() 
                                       + "）的连接"); 
                    new Handler(selector, socketChannel); 
                } 
 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
} 
 
class Handler implements Runnable { 
 
    private static final int READ_STATUS  = 1; 
 
    private static final int WRITE_STATUS = 2; 
 
    private SocketChannel    socketChannel; 
 
    private SelectionKey     selectionKey; 
 
    private int              status       = READ_STATUS; 
 
    public Handler(Selector selector, SocketChannel socketChannel) { 
        this.socketChannel = socketChannel; 
        try { 
            socketChannel.configureBlocking(false); 
            selectionKey = socketChannel.register(selector, 0); 
            selectionKey.interestOps(SelectionKey.OP_READ); 
            selectionKey.attach(this); 
            selector.wakeup(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
 
    public void run() { 
        try { 
            if (status == READ_STATUS) { 
                read(); 
                selectionKey.interestOps(SelectionKey.OP_WRITE); 
                status = WRITE_STATUS; 
            } else if (status == WRITE_STATUS) { 
                process(); 
                selectionKey.cancel(); 
                System.out.println("服务器发送消息成功!"); 
            } 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
 
    public void read() throws IOException { 
        ByteBuffer buffer = ByteBuffer.allocate(1024); 
        socketChannel.read(buffer); 
        System.out.println("接收到来自客户端（" + socketChannel.socket().getInetAddress().getHostAddress() 
                           + "）的消息：" + new String(buffer.array())); 
    } 
 
    public void process() throws IOException { 
        String content = "Hello World!"; 
        ByteBuffer buffer = ByteBuffer.wrap(content.getBytes()); 
        socketChannel.write(buffer); 
    } 
}