import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
import java.net.*;
import java.util.*;

public class HttpServer{
  private Selector selector = null;
  private ServerSocketChannel serverSocketChannel = null;
  private int port = 80;
  private Charset charset=Charset.forName("GBK");

  public HttpServer()throws IOException{
    selector = Selector.open();
    serverSocketChannel= ServerSocketChannel.open();
    serverSocketChannel.socket().setReuseAddress(true);
    serverSocketChannel.configureBlocking(false);
    serverSocketChannel.socket().bind(new InetSocketAddress(port));
    System.out.println("服務器啟動");
  }

  public void service() throws IOException{
    serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT,new AcceptHandler());
    for(;;){
      int n = selector.select();

      if(n==0)continue;
      Set readyKeys = selector.selectedKeys();
      Iterator it = readyKeys.iterator();
      while (it.hasNext()){
        SelectionKey key=null;
        try{
            key = (SelectionKey) it.next();
            it.remove();
  	    final Handler handler = (Handler)key.attachment();
            handler.handle(key);
        }catch(IOException e){
           e.printStackTrace();
           try{
               if(key!=null){
                   key.cancel();
                   key.channel().close();
               }
           }catch(Exception ex){e.printStackTrace();}
        }
      }//#while
    }//#while
  }


  public static void main(String args[])throws Exception{
    final HttpServer server = new HttpServer();
    server.service();
  }
}





/****************************************************
 * 作者：孫衛琴                                     *
 * 來源：<<Java網絡編程精解>>                       *
 * 技術支持網址：www.javathinker.org                *
 ***************************************************/