IP组播 MulticastChannel接口 DatagramChannel实现

Posted 2021-01-09 wallace-s-book

监听者

 1 import java.io.IOException;
 2 import java.net.InetAddress;
 3 import java.net.InetSocketAddress;
 4 import java.net.NetworkInterface;
 5 import java.net.StandardProtocolFamily;
 6 import java.net.StandardSocketOptions;
 7 import java.nio.ByteBuffer;
 8 import java.nio.channels.Channels;
 9 import java.nio.channels.DatagramChannel;
10 import java.nio.channels.MulticastChannel;
11 import java.nio.channels.WritableByteChannel;
12 import java.util.Enumeration;
13 
14 public class MulticastSniffer {
15 
16     public static void main(String[] args) throws IOException {
17         //NetworkInterface interf = NetworkInterface.getByInetAddress(InetAddress.getLocalHost());
18         NetworkInterface interf = NetworkInterface.getByInetAddress(InetAddress.getByName("192.168.1.181"));
19         //设置本地硬件端口；
20         
21         InetSocketAddress group = new InetSocketAddress(InetAddress.getByName("224.0.0.1"), 2000);
22         //设置组播地址
23         DatagramChannel channel = DatagramChannel.open(StandardProtocolFamily.INET)
24                 .setOption(StandardSocketOptions.SO_REUSEADDR, true)
25                 .setOption(StandardSocketOptions.IP_MULTICAST_LOOP, false)
26                 .bind(group)
27                 .setOption(StandardSocketOptions.IP_MULTICAST_IF, interf);
28         
29         channel.configureBlocking(true);
30         
31         try(MulticastChannel multicast = channel){
32             multicast.join(group.getAddress(), interf);
33             
34             byte[] data = new byte[8192];
35             ByteBuffer buffer = ByteBuffer.allocate(8192);
36             WritableByteChannel out = Channels.newChannel(System.out);
37             while((((DatagramChannel)multicast).receive(buffer))!= null) {
38                 buffer.flip();
39                 out.write(buffer);
40                 buffer.clear();
41             }
42             
43         }catch(IOException e) {
44             e.printStackTrace();
45         }
46         
47     }
48 
49 }

发送者

 1 import java.io.IOException;
 2 import java.net.InetAddress;
 3 import java.net.InetSocketAddress;
 4 import java.net.NetworkInterface;
 5 import java.net.StandardProtocolFamily;
 6 import java.net.StandardSocketOptions;
 7 import java.nio.ByteBuffer;
 8 import java.nio.channels.DatagramChannel;
 9 import java.nio.channels.MulticastChannel;
10 
11 public class MulticastSender {
12 
13     public static void main(String[] args) throws IOException {
14         
15        // NetworkInterface interf = NetworkInterface.getByInetAddress(InetAddress.getLocalHost());
16         
17         NetworkInterface interf = NetworkInterface.getByInetAddress(InetAddress.getByName("192.168.1.181"));
18         //设置本地硬件端口；
19         
20         InetSocketAddress group = new InetSocketAddress(InetAddress.getByName("224.0.0.1"), 2000);
21         //设置组播地址
22         DatagramChannel channel = DatagramChannel.open(StandardProtocolFamily.INET)
23                 .setOption(StandardSocketOptions.SO_REUSEADDR, true)
24                 .bind(group)
25                 .setOption(StandardSocketOptions.IP_MULTICAST_IF, interf);
26         
27         //.setOption(StandardSocketOptions.IP_MULTICAST_LOOP, false)
28         channel.configureBlocking(true);
29         
30         try(MulticastChannel multicast = channel){
31             multicast.join(group.getAddress(), interf);
32             
33             ByteBuffer buffer = ByteBuffer.allocate(8192);
34             buffer.put((InetAddress.getLocalHost().toString()+‘
‘).getBytes());
35             for(int i=0; i<3; i++) {
36                 buffer.flip();
37                 ((DatagramChannel)multicast).send(buffer, group);
38             }
39             
40         }catch(IOException e) {
41             e.printStackTrace();
42         }
43 
44     }
45 
46 }