在多播套接字上接收单播

2 回答

• 0

  组播套接字是否可以接收未发送到其加入的组播组的数据报？

  是的，它可以 . 它可以加入零个或多个组播组 . 这不会影响其单播功能 .

  回复于 2024-04-25T14:19:55+08:00
• 2

  添加以下代码以供参考..我们能够在同一端口接收多播和单播消息 .

  import java.net.DatagramPacket;
  import java.net.InetAddress;
  import java.net.MulticastSocket;
  
  public class MulticastReceiver {
  
          public static void main(String[] args) throws Exception {
              int mcPort = 1800;
              String mcIPStr = "239.255.255.250";
              MulticastSocket mcSocket = null;
              InetAddress mcIPAddress = null;
              mcIPAddress = InetAddress.getByName(mcIPStr);
              mcSocket = new MulticastSocket(mcPort);
              System.out.println("Multicast Receiver running at:"
                      + mcSocket.getLocalSocketAddress());
              mcSocket.joinGroup(mcIPAddress);
  
  
          boolean var=true;           
          while(var){ 
              DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);
              System.out.println("Waiting for a  multicast message...");
              mcSocket.receive(packet);
  
          System.out.println("packet length is " +packet.getLength());
  
  
              String msg = new String(packet.getData(),0,1024);
              System.out.println("[Multicast  Receiver] Received:" + msg);
          }
              mcSocket.leaveGroup(mcIPAddress);
              mcSocket.close();
  
  
          }
      }
  

  回复于 2024-04-25T14:19:55+08:00