java发送udp广播包

2013-06-07 22:44 1272人阅读 评论(2) 收藏 举报

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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();

}

}

}

}