import?java.io.*;
	import?java.net.DatagramPacket;
	import?java.net.DatagramSocket;
	import?java.net.InetAddress;
	import?java.text.SimpleDateFormat;
	import?java.util.Date;
	import?java.util.Random;
	?
	public?class?PingClient?{
	????private?static?final?double?LOSS_RATE?=?0.3;
	????private?static?final?int?AVERAGE_DELAY?=?100;???????//?milliseconds
	?????
	????public?static?void?main（String[]?args）?throws?Exception?{
	????????//?Get?command?line?argument.
	????????if?（args.length?==?0）?{
	????????????System.out.println（“Required?arguments:?host?port“）;?
	????????????return;
	????????}
	?????????
	????????if（args.length?==?1）?{
	????????????System.out.println（“Required?arguments:?port“）;
	????????????return;
	????????}
	?????????
	????????String?host?=?args[0].toString（）;
	????????int?port?=?Integer.parseInt（args[1]）;
	?????????
	????????//?發起向服務器的連接????????
	????????DatagramSocket?clientSocket?=?new?DatagramSocket（）;
	????????//?等待1秒鐘
	????????clientSocket.setSoTimeout（1000）;
	?
	????????InetAddress?IPAddress?=?InetAddress.getByName（host）;
	?????????
	????????for（int?i?=?0;?i?	????????????//?發送報文
	????????????byte[]?sendData?=?new?byte[1024];
	????????????byte[]?receiveData?=?new?byte[1024];
	????????????Date?currentTime?=?new?Date（）;
	????????????SimpleDateFormat?formatter?=?new?SimpleDateFormat（“yyyy-MM-dd?HH:mm:ss“）;
	????????????String?timeStamp?=?formatter.format（currentTime）;
	????????????String?pingMessage?=?“PING?“?+?i?+?“?“?+?timeStamp?;
	????????????sendData?=?pingMessage.getBytes（）;
	????????????DatagramPacket?sendPacket?=?new?DatagramPacket（sendData?sendData.length?IPAddress?port）;
	????????????try{
	????????????????clientSocket.send（sendPacket）;
	?????????????????
	????????????????DatagramPacket?receivePacket?=?new?DatagramPacket（receiveData?receiveData.length）;
	????????????????clientSocket.receive（receivePacket）;
	????????????????String?reply?=?new?String（receivePacket.getData（））;
	????????????????System.out.println（“FROM?SERVER:?“?+?reply）;
	????????????}?catch?（java.net.SocketTimeoutException?ex）?{
	????????????????String?reply?=?“No?reply.“;
	????????????????System.out.println（“FROM?SERVER:?“?+?reply）;
	????????????}
	????????}
	????????//?關閉與服務器的UDP連接
	????????clientSocket.close（）;
	????}
	}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????232??2011-12-04?19:23??UDP-Pinger\.classpath

?????文件????????386??2011-12-04?19:23??UDP-Pinger\.project

?????文件???????2676??2011-12-07?22:07??UDP-Pinger\bin\PingClient.class

?????文件???????2610??2011-12-07?21:50??UDP-Pinger\bin\PingServer.class

?????文件???????2356??2011-12-07?22:07??UDP-Pinger\src\PingClient.java

?????文件???????3490??2011-12-07?21:50??UDP-Pinger\src\PingServer.java

?????目錄??????????0??2011-12-04?19:25??UDP-Pinger\bin

?????目錄??????????0??2011-12-04?19:25??UDP-Pinger\src

?????目錄??????????0??2011-12-04?19:23??UDP-Pinger

-----------?---------??----------?-----??----

????????????????11750????????????????????9