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有沒有更好的方法來檢查我是否可以接收給定的IP多播傳輸。下面的代碼工作正常，但這個代碼有問題 - 它阻塞當前線程，直到它獲得多播數據包。IPv6多播檢查Java
謝謝。
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
public class MulticastTest {
static String MCAST_ADDR = "FF7E:230::1234";// "235.1.1.1";
static int DEST_PORT = 1234;
static int BUFFER_LENGTH = 16;
public static void main(String args[]) {
try {
byte[] b = new byte[BUFFER_LENGTH];
DatagramPacket dgram = new DatagramPacket(b, b.length);
MulticastSocket socket = new MulticastSocket(DEST_PORT);
socket.joinGroup(InetAddress.getByName(MCAST_ADDR));
socket.receive(dgram); // blocks until a datagram is received
System.err.println("Received " + dgram.getLength() + " bytes from " + dgram.getAddress());
dgram.setLength(b.length); // must reset length field!
} catch (Exception e) {
}
}
}