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...

1 public class TimeServer {
2
3     public static void main(String[] args) {
4         MultipexerTimeServer timersServer=new MultipexerTimeServer("192.168.1.102", 8400);
5         new Thread(timersServer, "nio-多路复用器").start();
6     }
7
8 }

  1 public class MultipexerTimeServer implements Runnable {
  2
  3     private Selector selector;
  4
  5     private ServerSocketChannel serverSocketChannel;
  6
  7     private volatile boolean stop;
  8
  9     public MultipexerTimeServer(String addr,int point){
 10         try {
 11             selector=Selector.open();
 12             serverSocketChannel=ServerSocketChannel.open();
 13             serverSocketChannel.socket().bind(new InetSocketAddress(addr, point));
 14             serverSocketChannel.configureBlocking(false);
 15             serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
 16             System.out.println("socket服务端:"+serverSocketChannel.socket().getInetAddress()+":"+serverSocketChannel.socket().getLocalPort()+"");
 17         } catch (Exception e) {
 18             e.printStackTrace();
 19             System.exit(1);
 20         }
 21     }
 22
 23     public void stop(){
 24         this.stop=true;
 25     }
 26
 27     @Override
 28     public void run() {
 29         while(!stop){
 30             try {
 31                 selector.select(1000);
 32                 Set<SelectionKey> selectionKeys=selector.selectedKeys();
 33                 if(selectionKeys !=null && selectionKeys.size()>0){
 34                     Iterator<SelectionKey> it=selectionKeys.iterator();
 35                     SelectionKey key=null;
 36                     while(it.hasNext()){
 37                         key=it.next();
 38                         it.remove();
 39                         try {
 40                             handleInput(key);
 41                         } catch (Exception e) {
 42                             if(key!=null){
 43                                 key.cancel();
 44                                 if(key.channel()!=null){
 45                                     try {
 46                                         key.channel().close();
 47                                     } catch (Exception e1) {
 48                                         e1.printStackTrace();
 49                                     }
 50                                 }
 51                             }
 52                         }
 53                     }
 54                 }
 55             } catch (Exception e) {
 56                 e.printStackTrace();
 57             }
 58         }
 59         if(selector!=null){
 60             try {
 61                 selector.close();
 62             } catch (Exception e) {
 63                 e.printStackTrace();
 64             }
 65         }
 66     }
 67
 68     private void handleInput(SelectionKey key) throws IOException{
 69         if(key.isValid()){
 70             //处理新接入的请求
 71             if(key.isAcceptable()){
 72                 ServerSocketChannel ssc=(ServerSocketChannel)key.channel();
 73                 SocketChannel sc=ssc.accept();
 74                 sc.configureBlocking(false);
 75                 sc.register(selector,SelectionKey.OP_READ);
 76                 SocketAddress clientAddress =sc.getRemoteAddress();
 77                 System.out.println("socket链接新客户端:" + clientAddress);
 78             }
 79             if(key.isReadable()){
 80                 //读取数据
 81                 SocketChannel sc=(SocketChannel)key.channel();
 82                 ByteBuffer readBuffer=ByteBuffer.allocate(1024);
 83                 int readBytes=sc.read(readBuffer);
 84                 if(readBytes>0){
 85                     readBuffer.flip();
 86                     byte[] bytes=new byte[readBuffer.remaining()];
 87                     readBuffer.get(bytes);
 88                     String body=new String(bytes, Charset.forName("GBK"));
 89                     SocketAddress clientAddress =sc.getRemoteAddress();
 90                     System.out.println("socket链接老客户端:" + clientAddress);
 91                     System.out.println("服务器接收数据:"+body);
 92                     //然后回写点数据给客服端
 93                     SimpleDateFormat  dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 94                     String time=dateFormat.format(new Date());
 95                     String res="来自与服务端的回应,时间:"+ time;
 96                     doWrite(sc,res);
 97                 }else if(readBytes<0){
 98                     key.cancel();
 99                     sc.close();
100                 }else{
101                     //System.out.println("服务器收到0字节数据...");
102                 }
103             }
104         }
105     }
106
107     private void doWrite(SocketChannel sc,String res) throws IOException{
108         if(res!=null && res.trim().length()>0){
109             byte[] bytes=res.getBytes();
110             ByteBuffer byteBuffer=ByteBuffer.allocate(1024);
111             byteBuffer.put(bytes);
112             byteBuffer.flip();
113             sc.write(byteBuffer);
114         }
115     }
116     

代码不想解释太多，有空整理一下nio的基本概念...