java socket nio编程

上次写了一个socket的基本编程，但是有个问题，阻塞特别严重，于是小编便去找了nio学习了一下...

 public class TimeServer {

     public static void main(String[] args) {
         MultipexerTimeServer timersServer=new MultipexerTimeServer("192.168.1.102", 8400);
         new Thread(timersServer, "nio-多路复用器").start();
     }

 }

 public class MultipexerTimeServer implements Runnable {

     private Selector selector;

     private ServerSocketChannel serverSocketChannel;

     private volatile boolean stop;

     public MultipexerTimeServer(String addr,int point){
         try {
             selector=Selector.open();
             serverSocketChannel=ServerSocketChannel.open();
             serverSocketChannel.socket().bind(new InetSocketAddress(addr, point));
             serverSocketChannel.configureBlocking(false);
             serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
             System.out.println("socket服务端:"+serverSocketChannel.socket().getInetAddress()+":"+serverSocketChannel.socket().getLocalPort()+"");
         } catch (Exception e) {
             e.printStackTrace();
             System.exit(1);
         }
     }

     public void stop(){
         this.stop=true;
     }

     @Override
     public void run() {
         while(!stop){
             try {
                 selector.select(1000);
                 Set<SelectionKey> selectionKeys=selector.selectedKeys();
                 if(selectionKeys !=null && selectionKeys.size()>0){
                     Iterator<SelectionKey> it=selectionKeys.iterator();
                     SelectionKey key=null;
                     while(it.hasNext()){
                         key=it.next();
                         it.remove();
                         try {
                             handleInput(key);
                         } catch (Exception e) {
                             if(key!=null){
                                 key.cancel();
                                 if(key.channel()!=null){
                                     try {
                                         key.channel().close();
                                     } catch (Exception e1) {
                                         e1.printStackTrace();
                                     }
                                 }
                             }
                         }
                     }
                 }
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
         if(selector!=null){
             try {
                 selector.close();
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
     }

     private void handleInput(SelectionKey key) throws IOException{
         if(key.isValid()){
             //处理新接入的请求
             if(key.isAcceptable()){
                 ServerSocketChannel ssc=(ServerSocketChannel)key.channel();
                 SocketChannel sc=ssc.accept();
                 sc.configureBlocking(false);
                 sc.register(selector,SelectionKey.OP_READ);
                 SocketAddress clientAddress =sc.getRemoteAddress();
                 System.out.println("socket链接新客户端:" + clientAddress);
             }
             if(key.isReadable()){
                 //读取数据
                 SocketChannel sc=(SocketChannel)key.channel();
                 ByteBuffer readBuffer=ByteBuffer.allocate(1024);
                 int readBytes=sc.read(readBuffer);
                 if(readBytes>0){
                     readBuffer.flip();
                     byte[] bytes=new byte[readBuffer.remaining()];
                     readBuffer.get(bytes);
                     String body=new String(bytes, Charset.forName("GBK"));
                     SocketAddress clientAddress =sc.getRemoteAddress();
                     System.out.println("socket链接老客户端:" + clientAddress);
                     System.out.println("服务器接收数据:"+body);
                     //然后回写点数据给客服端
                     SimpleDateFormat  dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                     String time=dateFormat.format(new Date());
                     String res="来自与服务端的回应,时间:"+ time;
                     doWrite(sc,res);
                 }else if(readBytes<0){
                     key.cancel();
                     sc.close();
                 }else{
                     //System.out.println("服务器收到0字节数据...");
                 }
             }
         }
     }

     private void doWrite(SocketChannel sc,String res) throws IOException{
         if(res!=null && res.trim().length()>0){
             byte[] bytes=res.getBytes();
             ByteBuffer byteBuffer=ByteBuffer.allocate(1024);
             byteBuffer.put(bytes);
             byteBuffer.flip();
             sc.write(byteBuffer);
         }
     }
     

代码不想解释太多，有空整理一下nio的基本概念...