2021-08-11

network/src/main/java/kr/pe/elex/examples/multicast/MulticastUdpClientSample.java

@@ -11,24 +11,48 @@ import lombok.extern.slf4j.Slf4j;
 
 import java.io.IOException;
 import java.net.DatagramPacket;
-import java.net.DatagramSocket;
 import java.net.InetAddress;
 import java.net.MulticastSocket;
-import java.nio.charset.StandardCharsets;
 
 @Slf4j
 public class MulticastUdpClientSample {
 	public static void main(String... args) throws IOException {
+		new Thread() {
+			@Override
+			public void run() {
+				try {
+					client("ONE");
+				} catch (IOException e) {
+					log.error("Oops", e);
+				}
+			}
+		}.start();
+
+		new Thread() {
+			@Override
+			public void run() {
+				try {
+					client("TWO");
+				} catch (IOException e) {
+					log.error("Oops", e);
+				}
+			}
+		}.start();
+	}
+
+	public static void client(String name) throws IOException {
 		MulticastSocket socket = new MulticastSocket(18888);
 		InetAddress group = InetAddress.getByName("224.0.0.1");
 		socket.joinGroup(group);
 
-		// 수신
+		for (int i = 0; i < 10; i++) {
-		byte[] buf = new byte[256];
+			// 수신
-		DatagramPacket packet = new DatagramPacket(buf, buf.length);
+			byte[] buf = new byte[256];
-		socket.receive(packet);
+			DatagramPacket packet = new DatagramPacket(buf, buf.length);
-		String received = new String(packet.getData(), 0, packet.getLength());
+			socket.receive(packet);
-		log.info("Rx: {}", received);
+			String received = new String(packet.getData(), 0, packet.getLength());
+			log.info("{} Rx: {}", name, received);
+		}
 
 		socket.leaveGroup(group);
 		socket.close();