java 收发信息的实例

来源：互联网发布：网络安全形势分析编辑：程序博客网时间：2024/05/02 06:44

package net;

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

public class socket {
     public static final int PORT = 80;
      public static final String ADDR = "127.0.0.1";
      private MulticastSocket sock;
      private InetAddress netAddr;

      public socket()
      {
             try   {
                     //   组播地址
                     netAddr = InetAddress.getByName(ADDR);
                      sock   = new MulticastSocket(PORT);
                      sock.joinGroup(netAddr);
             }
             catch (UnknownHostException ex)
             {

             }
             catch (IOException ex)
             {

             }
      }

      public void send(byte[] b)
      {
             DatagramPacket dp = new DatagramPacket(b,0,b.length,netAddr,PORT);
             try   {
                     sock.send(dp);
                     System.out.println("sent");

                     byte[] buf = new byte[1024];
                     DatagramPacket rcv = new DatagramPacket(buf,buf.length);
                     sock.receive(rcv);
                     System.out.println("receive:" + new String(rcv.getData()));
             }
             catch (IOException   ex)
             {
                  ex.printStackTrace();
             }
        }

public static void main(String[] args) {
  // TODO Auto-generated method stub
  socket sender = new socket();
         sender.send("yhaha".getBytes());
}

}