import?java.io.BufferedReader;
import?java.io.InputStreamReader;
import?java.io.StringReader;
import?java.net.DatagramPacket;
import?java.net.DatagramSocket;
import?java.net.InetAddress;
import?java.text.SimpleDateFormat;
import?java.util.Date;

public?class?PingClient
{
	public?static?void?main（String[]?args）?throws?Exception
	{
		String?address?=?args[0];			//從命令行獲得server?ip地址
		int?port?=?new?Integer（args[1]）;	//從命令行獲得server?port

		Long[]?rtt?=?new?Long[10];			//用于存儲(chǔ)rtt，用于最后的統(tǒng)計(jì)
		
		for?（int?i?=?1;?i?<=?10;?i++）		//模擬發(fā)送10條請(qǐng)求
		{
			SimpleDateFormat?sdf?=?new?SimpleDateFormat（“yyyy-MM-dd?hh:mm:ss.SS“）;		//時(shí)間戳格式
			
			String?sentence?=?“head:?request?“?+?i?+?“?\n“								//模擬用的請(qǐng)求數(shù)據(jù)
					+?“playload:?PingUDP?SequenceNumber:“?+?i?+?“?TimeStamp:“
					+?sdf.format（new?Date（））?+?“\n“;
			
			DatagramSocket?clientSocket?=?new?DatagramSocket（）;			//生成client端socket實(shí)例
			
			InetAddress?IPAddress?=?InetAddress.getByName（address）;		//生成ip地址實(shí)例
			
			byte[]?sendData?=?new?byte[1024];			//用于接收數(shù)據(jù)的byte數(shù)組
			byte[]?receiveData?=?new?byte[1024];		//用于發(fā)送數(shù)據(jù)的byte數(shù)組
			
			sendData?=?sentence.getBytes（）;			//將請(qǐng)求數(shù)據(jù)轉(zhuǎn)換到byte數(shù)組
			
			DatagramPacket?sendPacket?=?new?DatagramPacket（sendData?sendData.length?IPAddress?port）;		//生成發(fā)送數(shù)據(jù)包實(shí)例
			
			Date?sendBefore?=?new?Date（）;			//記錄發(fā)送前時(shí)間
			
			clientSocket.send（sendPacket）;			//發(fā)送到server端
			
			DatagramPacket?receivePacket?=?new?DatagramPacket（receiveData	receiveData.length）;			//生成接收數(shù)據(jù)包實(shí)例
			
			clientSocket.receive（receivePacket）;	//接收從server返回的數(shù)據(jù)包
			
			Date?receiveAfter?=?new?Date（）;			//記錄接收后的時(shí)間?
			
			String?modifiedSentence?=?new?String（receivePacket.getData（））;		//從byte數(shù)組轉(zhuǎn)換成String
			
			rtt[i?-?1]?=?receiveAfter.getTime（）?-?sendBefore.getTime（）;			//計(jì)算rtt
			
			System.out.println（“rtt:“?+?rtt[i?-?1]）;			//顯示rtt
			
			System.out.println（modifiedSentence）;				//顯示從server返回的數(shù)據(jù)

			clientSocket.close（）;			//關(guān)閉socket
		}

		//統(tǒng)計(jì)出平均rtt最大rtt和最小rtt
		
		long?sumRtt?=?0;
		long?maxRtt?=?0;
		long?minRtt?=?rtt[0];
		for?（int?i?=?0;?i?		{
			if?（rtt[i]?>?maxRtt）
			{
				maxRtt?=?rtt[i];
			}

			if?（rtt[i]?			{
				minRtt?=?rtt[i];
			}

			sumRtt?+=?rtt[i];
		}

		System.out.println（“average?rtt:?“?+?sumRtt?/?10?+?“?millisecond“）;
		System.out.println（“max?rtt:?“?+?maxRtt）;
		System.out.println（“min?rtt:?“?+?minRtt）;
	}
}

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????文件????????2343??2014-01-07?09:58??計(jì)算機(jī)網(wǎng)絡(luò)\PingClient.class
?????文件????????2561??2014-01-05?11:46??計(jì)算機(jī)網(wǎng)絡(luò)\PingClient.java
?????文件????????1392??2014-01-07?09:58??計(jì)算機(jī)網(wǎng)絡(luò)\PingServer.class
?????文件????????1697??2014-01-05?11:46??計(jì)算機(jī)網(wǎng)絡(luò)\PingServer.java
?????文件??????594732??2014-10-26?14:46??計(jì)算機(jī)網(wǎng)絡(luò)\計(jì)算機(jī)網(wǎng)絡(luò)課設(shè).doc