实验3基于UDP的Ping客户机与服务器程序Word文件下载.docx
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实验3基于UDP的Ping客户机与服务器程序Word文件下载.docx
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Noreply.
PING22010-06-2020:
09
PING42010-06-2020:
10
PING62010-06-2020:
11
PING72010-06-2020:
PING82010-06-2020:
PING92010-06-2020:
可见第1个、第3个与第5个PING报文没有得到响应。
以下是服务器端对应的运行结果:
D:
\jie.tian\Java\UDPPinger>
javaPingServer7890
Receivedfrom+192.168.172.9:
Replysent.
PING12010-06-2020:
08
Replynotsend.
PING32010-06-2020:
PING52010-06-2020:
以下分别是服务器程序和客户机程序的Java源代码。
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importjava.io.*;
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import.*;
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importjava.util.*;
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/**
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*ServertoprocesspingrequestsoverUDP.
*@author涂鸦
*
*/
publicclassPingServer{
privatestaticfinaldoubleLOSS_RATE=0.3;
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privatestaticfinalintAVERAGE_DELAY=100;
//milliseconds
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publicstaticvoidmain(String[]args)throwsException{
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//Getcommandlineargument.
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if(args.length!
=1){
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System.out.println("
Requiredarguments:
port"
);
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return;
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}
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intport=Integer.parseInt(args[0]);
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//Createrandomnumbergeneratorforuseinsimulatingpacketlossandnetworkdelay.
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Randomrandom=newRandom();
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//CreateadatagramsocketforreceivingandsendingUDPpacketsthroughtheportspecified
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//onthecommandline.
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DatagramSocketsocket=newDatagramSocket(port);
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//Processingloop.
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while(true){
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//CreateadatagrampackettoholdincomingUDPpacket.
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DatagramPacketrequest=newDatagramPacket(newbyte[1024],1024);
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//BlockuntilthehostreceivesaUDPpacket.
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socket.receive(request);
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//Printthereceiveddata.
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printData(request);
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//Decidewhethertoreply,orsimulatepacketloss.
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if(random.nextDouble()<
LOSS_RATE){
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Replynotsend."
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continue;
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//Simulatenetworkdelay.
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Thread.sleep((int)(random.nextDouble()*2*AVERAGE_DELAY));
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//Sendreply.
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InetAddressclientHost=request.getAddress();
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intclientPort=request.getPort();
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byte[]buf=request.getData();
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DatagramPacketreply=newDatagramPacket(buf,buf.length,clientHost,clientPort);
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socket.send(reply);
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Replysent."
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*Printpingdatatothestandardoutputstream.
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privatestaticvoidprintData(DatagramPacketrequest)throwsException{
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//Obtainreferencestothepacket'
sarrayofbytes.
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//Wrapthebytesinabytearrayinputstream,sothatyoucanreadthedataasastream
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//ofbytes.
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ByteArrayInputStreambais=newByteArrayInputStream(buf);
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//Wrapthebytearrayoutputstreaminaninputstreamreader,
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//soyoucanreadthedataasastreamofcharacters.
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InputStreamReaderisr
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