java发送udp广播包

2024-09-01 17:23:28

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();
}
}
}
}

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