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最新推荐文章于 2024-01-02 21:42:56 发布

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最新推荐文章于 2024-01-02 21:42:56 发布

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本文链接：https://blog.youkuaiyun.com/qq_23330625/article/details/76409368

版权

package liaotianshi;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.JTextArea;

public class Receiver extends Thread {
	private JTextArea jta;

	public Receiver(JTextArea jta) {
		this.jta = jta;
	}

	@Override
	public void run() {
		try {
			MulticastSocket ms = new MulticastSocket(9999);
			InetAddress groupIp = InetAddress.getByName("226.6.6.6");
			ms.joinGroup(groupIp);
			String s = "";
			byte[] b = new byte[1024];
			DatagramPacket dp = new DatagramPacket(b, b.length);
			SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
			while (true) {
				ms.receive(dp);
				s = new String(dp.getData(), dp.getOffset(), dp.getLength());
				jta.append(dp.getAddress().getHostAddress() + " " + sdf.format(new Date()) + "\n" + s + "\n\n");
			}
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

package liaotianshi;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

public class Sender {

	public void send(String msg) throws IOException {
		MulticastSocket ms = new MulticastSocket();
		InetAddress groupIp = InetAddress.getByName("226.6.6.6");
		ms.joinGroup(groupIp);
		DatagramPacket dp = new DatagramPacket(msg.getBytes(), msg.getBytes().length);
		dp.setAddress(groupIp);
		dp.setPort(9999);
		ms.send(dp);
	}
}