关于Nio具体工作过程示例代码

 1 public void selector() throws IOException { 2     
 ByteBuffer buffer = ByteBuffer.allocate(1024); 3     
 Selector selector = Selector.open(); 4     
 ServerSocketChannel ssc = ServerSocketChannel.open(); 5     
 ssc.configureBlocking(false);//设置为非阻塞模式 6     
 ssc.socket().bind(new InetSocketAddress(8080)); 7     
 ssc.register(selector, SelectionKey.OP_ACCEPT);//注册监听事件 8     
 while(true) { 9         Set selectorKeys = selector.selectorKeys();
 //取得所有key的集合10         Iterator it = selectorKeys.iterator();11         
 while(it.hasNext()) { //检查序列是否还有元素12             
 SelectionKey key = (SelectionKey) it.next();13             
 if((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {14                 
 ServerSocketChannel ssChannel = (ServerSocketChannel) key.channel();15                 
 SocketChannel sc = ssChannel.accept();//接受到服务端的请求16                 
 sc.configureBlocking(false);17                 
 sc.register(selector,SelectionKey.OP_ACCEPT);18                 
 it.remove();19             } 
 else if((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {20                 
 SocketChannel sc = (SocketChannel) key.channel;21                 
 while(true) {22                     buffer.clear();23                     
 int n = sc.read(buffer);//读取数据24                     
 if(n <= 0) {25                         
 break;26                     }                     
 buffer.flip();28                 }                
 it.remove();30             }    
 }
 }
 }