请教！应该怎么改那？

Question

import java.io.*;
import java.net.*;
class rend{
public static void main(String args[]) throws Exception
{

DatagramSocket clientSocket = new DatagramSocket();
InetAddress IPAdress=InetAddress.getByName("127.0.0.1");
byte[] sendData = new byte[1024];

FileInputStream fileIn = new FileInputStream("d://aaa.txt");
int bytes = fileIn.read(sendData,0,2056);

DatagramPacket sendPacket = 
new DatagramPacket(sendData,sendData.length,IPAdress,25);
clientSocket.send(sendPacket);
clientSocket.close();
}
}