import java.io.*;
import java.net.*;

public class ClientServer
{
	public static  void main(String args[])
	{
		DatagramSocket UdpClientSocket;
		DatagramPacket ClientPacket;
		InetAddress RemoteHost;
		int RemotePort;
		byte dataBuf[]=new byte[512];
		String Datagram,s;
	/*	if(args.length<3)
		{
			System.out.println("請輸入本地端口號，遠程服務器主機名，服務器端口號");
			System.exit(0);
		}*/
		
		try{
			UdpClientSocket=new DatagramSocket(8000);
			RemoteHost=InetAddress.getByName("dcx");
			RemotePort=8000;
			Datagram=new String("This mail is from"+InetAddress.getLocalHost().getHostName()+",give me a reicept\nif you can receive it,thank you!");
			Datagram.getBytes(0,Datagram.length(),dataBuf,0);
			//把字符竄型的字符變成字節型的
			ClientPacket=new DatagramPacket(dataBuf,512,RemoteHost,RemotePort);
			UdpClientSocket.send(ClientPacket);
			//send message
			for(int i=0;i<512;i++)
			dataBuf[i]=0;//CLEAR
			
		//	UdpClientSocket.receive(ClientPacket);
			
		//	Datagram=new String(ClientPacket.getData());
		//	System.out.println("從遠程服務器主機"+ClientPacket.getAddress()+"收到如下應答信息");
			
		//	System.out.println(Datagram);
			UdpClientSocket.close();
			}
			catch(Exception e)
			{
				System.err.println(e);
			}
	}
}