Java NIO——6 基于非阻塞编程UDP NIO的例子

转自 http://blog.csdn.net/chenxuegui1234/article/details/17981203

好吧，承接上篇文章，下面给出一个udp不可靠无连接的例子，他的次传送都是一个udp报文，不向上面文章中tcp是基于流的

代码：

Server:

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1. /** 
2.  * 服务器端 
3.  *  
4.  * @author Joeson 
5.  *  
6.  */  
7. public class UDPServer  
8. {  
9.     DatagramChannel channel;  
10.   
11.     Selector selector;  
12.   
13.     public void work()  
14.     {  
15.         try  
16.         {  
17.             // 打开一个UDP Channel  
18.             channel = DatagramChannel.open();  
19.   
20.             // 设定为非阻塞通道  
21.             channel.configureBlocking(false);  
22.             // 绑定端口  
23.             channel.socket().bind(new InetSocketAddress(8080));  
24.   
25.             // 打开一个选择器  
26.             selector = Selector.open();  
27.             channel.register(selector, SelectionKey.OP_READ);  
28.         } catch (Exception e)  
29.         {  
30.             e.printStackTrace();  
31.         }  
32.   
33.         ByteBuffer byteBuffer = ByteBuffer.allocate(65536);  
34.         while (true)  
35.         {  
36.             try  
37.             {  
38.                 // 进行选择  
39.                 int n = selector.select();  
40.                 if (n > 0)  
41.                 {  
42.                     // 获取以选择的键的集合  
43.                     Iterator iterator = selector.selectedKeys().iterator();  
44.   
45.                     while (iterator.hasNext())  
46.                     {  
47.                         SelectionKey key = (SelectionKey) iterator.next();  
48.   
49.                         // 必须手动删除  
50.                         iterator.remove();  
51.   
52.                         if (key.isReadable())  
53.                         {  
54.                             DatagramChannel datagramChannel = (DatagramChannel) key  
55.                                     .channel();  
56.   
57.                             byteBuffer.clear();  
58.                             // 读取  
59.                             InetSocketAddress address = (InetSocketAddress) datagramChannel  
60.                                     .receive(byteBuffer);  
61.   
62.                             System.out.println(new String(byteBuffer.array()));  
63.   
64.                             // 删除缓冲区中的数据  
65.                             byteBuffer.clear();  
66.   
67.                             String message = "data come from server";  
68.   
69.                             byteBuffer.put(message.getBytes());  
70.   
71.                             byteBuffer.flip();  
72.   
73.                             // 发送数据  
74.                             datagramChannel.send(byteBuffer, address);  
75.                         }  
76.                     }  
77.                 }  
78.             } catch (Exception e)  
79.             {  
80.                 e.printStackTrace();  
81.             }  
82.         }  
83.   
84.     }  
85.   
86.     public static void main(String[] args)  
87.     {  
88.         new UDPServer().work();  
89.   
90.     }  
91.   
92. }  

客户端：

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1. /** 
2.  * 客户端 
3.  *  
4.  * @author Joeson 
5.  */  
6. public class UDPClient  
7. {  
8.     DatagramChannel channel;  
9.     Selector selector;  
10.   
11.     public void work()  
12.     {  
13.   
14.         try  
15.         {  
16.             // 开启一个通道  
17.             channel = DatagramChannel.open();  
18.   
19.             channel.configureBlocking(false);  
20.   
21.             SocketAddress sa = new InetSocketAddress("localhost", 8080);  
22.   
23.             channel.connect(sa);  
24.         } catch (Exception e)  
25.         {  
26.             e.printStackTrace();  
27.         }  
28.   
29.         try  
30.         {  
31.             selector = Selector.open();  
32.             channel.register(selector, SelectionKey.OP_READ);  
33.             channel.write(Charset.defaultCharset().encode("data come from client"));  
34.         } catch (Exception e)  
35.         {  
36.             e.printStackTrace();  
37.         }  
38.   
39.         ByteBuffer byteBuffer = ByteBuffer.allocate(100);  
40.         while (true)  
41.         {  
42.             try  
43.             {  
44.                 int n = selector.select();  
45.                 if (n > 0)  
46.                 {  
47.   
48.                     Iterator iterator = selector.selectedKeys().iterator();  
49.   
50.                     while (iterator.hasNext())  
51.                     {  
52.                         SelectionKey key = (SelectionKey) iterator.next();  
53.                         iterator.remove();  
54.                         if (key.isReadable())  
55.                         {  
56.                             channel = (DatagramChannel) key.channel();  
57.                             channel.read(byteBuffer);  
58.   
59.                             System.out.println(new String(byteBuffer.array()));  
60.                               
61.                               
62.                             byteBuffer.clear();  
63.                               
64.                             channel.write(Charset.defaultCharset().encode(  
65.                                     "data come from client"));  
66.                         }  
67.                     }  
68.                 }  
69.             } catch (Exception e)  
70.             {  
71.                 e.printStackTrace();  
72.             }  
73.         }  
74.   
75.     }  
76.   
77.     public static void main(String[] args)  
78.     {  
79.         new UDPClient().work();  
80.     }  
81. }