DatagramChannel

 Java NIO中的DatagramChannel是一个能收发

　　UDP包的通道。

 操作步骤：

　　打开 DatagramChannel

　　接收/发送数据

 

 

服务端

@Test    public void receive() throws IOException{        DatagramChannel dc = DatagramChannel.open();                dc.configureBlocking(false);                dc.bind(new InetSocketAddress(8082));                //选择器        Selector selector = Selector.open();                dc.register(selector, SelectionKey.OP_READ);                while(selector.select() > 0){            Iterator
     
       it =  selector.selectedKeys().iterator();                        while(it.hasNext()){                SelectionKey sk = it.next();                                if(sk.isReadable()){                    ByteBuffer buf = ByteBuffer.allocate(1024);                                        //接收数据                    dc.receive(buf);                    buf.flip();                    System.out.println(new String(buf.array(),0,buf.limit()));                                    }            }            it.remove();        }    }
     

 

客户端：

@Test    public void send() throws IOException{                DatagramChannel dc = DatagramChannel.open();                dc.configureBlocking(false);                ByteBuffer buf = ByteBuffer.allocate(1024);                buf.put("MeChengs".getBytes());        buf.flip();        dc.send(buf, new InetSocketAddress("127.0.0.1", 8082));                dc.close();    }