java发送udp广播包

2013-06-07 22:44 1272人阅读 评论(2) 收藏 举报

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.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
public class UdpSend {
    public void sendData()throws SocketException,
    UnknownHostException{
        DatagramSocket ds = new DatagramSocket();// 创建用来发送数据报包的套接字
        String str = "hello";
        DatagramPacket dp = new DatagramPacket(str.getBytes(),
                str.getBytes().length,
                InetAddress.getByName("255.255.255.255"), 3001);
        // 构造数据报包，用来将长度为 length 的包发送到指定主机上的指定端口号
        try {
            ds.send(dp);
        } catch (IOException e) {
            e.printStackTrace();
        }
        ds.close();

    }
    public static void main(String[] args) {
        Timer timer = new Timer();
        timer.schedule(new MyTask(), 1000, 1000);
    }
    static class MyTask extends java.util.TimerTask{
        @Override
        public void run() {
            UdpSend tt = new UdpSend();
            try {
                    tt.sendData();
            } catch (SocketException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}