UDP协议下发送

import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.net.UnknownHostException;import java.util.Date;

public class TestIPMSG {

   public static void main(String[] args) {         DatagramSocket socket;         InetAddress address;

         long IPMSG_SENDMSG = 0x00000020;

         String SENDER = "张恩明";         String HOST = "localhost";         String MSG_CONTENT = "我要死了";

         try {             socket = new DatagramSocket();             address = InetAddress.getByName("192.168.1.18");// 发送给消息的地址

             /**              * IPMSG收发数据包的格式（一行）：              *               * version(IPMSG版本):no(消息编号，可以用系统时间):user(发送消息的用户名):              * host(发送消息的主机名):command(上述 Command 常量，可以用 | 组合多个值):              * msg(消息内容)              */             byte[] buffer = ("1:" + new Date().getTime() + ":" + SENDER + ":"                     + HOST + ":" + IPMSG_SENDMSG + ":" + MSG_CONTENT)                     .getBytes();

             DatagramPacket packet = new DatagramPacket(buffer, buffer.length,                     address, 2425);             socket.send(packet); // 发送报文                  packet = new DatagramPacket(buffer, buffer.length);             socket.receive(packet);// 接收回应

             String message = new String(packet.getData()); // 得到报文信息

             System.out.println(message); // 显示对方返回的信息                      } catch (UnknownHostException e) {             e.printStackTrace();         } catch (SocketException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         }

     }

}

相关资源：UDP发送信息