【游戏服务端开服 三 】 异步通信的服务端

 

package rodking.server;

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;

/**
 * @author rodking
 * @des 非阻塞的通信
 */
public class NIOServer {
    private Selector selector;

    public void initServer(int port) throws IOException {
        ServerSocketChannel serverChannel = ServerSocketChannel.open();
        // 设置为非阻塞模式
        serverChannel.configureBlocking(false);
        serverChannel.socket().bind(new InetSocketAddress(port));
        this.selector = Selector.open();

        serverChannel.register(this.selector, SelectionKey.OP_ACCEPT);
    }

    public void lisiten() throws IOException {
        System.out.println("Server Start...");
        while (true) {
            selector.select();
            Iterator<?> it = selector.selectedKeys().iterator();
            while (it.hasNext()) {
                SelectionKey key = (SelectionKey) it.next();
                it.remove();
                if (key.isAcceptable()) {
                    ServerSocketChannel server = (ServerSocketChannel) key.channel();
                    SocketChannel channel = server.accept();
                    channel.configureBlocking(false);
                    channel.write(ByteBuffer.wrap(new String("you giv me a message").getBytes()));

                    channel.register(selector, SelectionKey.OP_READ);

                } else if (key.isReadable()) {
                    read(key);
                }

            }
        }
    }

    private void read(SelectionKey key) throws IOException {
        SocketChannel channel = (SocketChannel) key.channel();
        ByteBuffer buf = ByteBuffer.allocate(10);
        channel.read(buf);
        byte[] data = buf.array();
        String str = new String(data).trim();
        System.out.println(" received message " + str);
        ByteBuffer outBuf = ByteBuffer.wrap(str.getBytes());
        channel.write(outBuf);
    }

    public static void main(String[] args) throws IOException {
        NIOServer nioServer = new NIOServer();
        nioServer.initServer(9000);
        nioServer.lisiten();
    }
}