final Selector selector;
final ServerSocketChannel serverSocket;

　　Reactor(int port) throws IOException {
selector = Selector.open();
serverSocket = ServerSocketChannel.open();
InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(),port);
serverSocket.socket().bind(address);

serverSocket.configureBlocking(false);
//向selector注册该channel
SelectionKey sk =serverSocket.register(selector,SelectionKey.OP_ACCEPT);

logger.debug("–>Start serverSocket.register!");

//利用sk的attache功能绑定Acceptor 如果有事情，触发Acceptor
sk.attach(new Acceptor());
logger.debug("–>attach(new Acceptor()!");
}

public void run() { // normally in a new Thread
try {
while (!Thread.interrupted())
{
selector.select();
Set selected = selector.selectedKeys();
Iterator it = selected.iterator();
//Selector如果发现channel有OP_ACCEPT或READ事件发生，下列遍历就会进行。
while (it.hasNext())
//来一个事件 第一次触发一个accepter线程
//以后触发SocketReadHandler
dispatch((SelectionKey)(it.next()));
selected.clear();
}
}catch (IOException ex) {
logger.debug("reactor stop!"+ex);
}
}

　　//运行Acceptor或SocketReadHandler
void dispatch(SelectionKey k) {
Runnable r = (Runnable)(k.attachment());
if (r != null){
// r.run();

　　　　}
}

　　class Acceptor implements Runnable { // inner
public void run() {
try {
logger.debug("–>ready for accept!");
SocketChannel c = serverSocket.accept();
if (c != null)
//调用Handler来处理channel
new SocketReadHandler(selector, c);
}
catch(IOException ex) {
logger.debug("accept stop!"+ex);
}
}
}
}

　　public static Logger logger = Logger.getLogger(SocketReadHandler.class);

　　private Test test=new Test();

　　final SocketChannel socket;
final SelectionKey sk;

static final int READING = 0, SENDING = 1;
int state = READING;

　　public SocketReadHandler(Selector sel, SocketChannel c)
throws IOException {

　　　　socket = c;

　　　　socket.configureBlocking(false);
sk = socket.register(sel, 0);

　　　　//将SelectionKey绑定为本Handler 下一步有事件触发时，将调用本类的run方法。
//参看dispatch(SelectionKey k)
sk.attach(this);

//同时将SelectionKey标记为可读，以便读取。
sk.interestOps(SelectionKey.OP_READ);
sel.wakeup();
}

　　public void run() {
try{
// test.read(socket,input);
readRequest() ;
}catch(Exception ex){
logger.debug("readRequest error"+ex);
}
}

/**
* 处理读取data
* @param key
* @throws Exception
*/
private void readRequest() throws Exception {

　　ByteBuffer input = ByteBuffer.allocate(1024);
input.clear();
try{

　　　　int bytesRead = socket.read(input);

　　　　……

　　　　//激活线程池 处理这些request
requestHandle(new Request(socket,btt));

　　　　…..

}catch(Exception e) {
}

}