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1、AbstractThe2-tierClient/Serverpatternwasinitsvigorousperiodintheearly90s'.Thefinance,telecommunicationbusinessenterpriseadoptedthistechniquetosetuptheirinternalnet.Thestructureisdividedintotwotiers:theclientandtheserver.itsmaincharacteristicsis:Client:Providingtheuseroperation
2、interface,acceptingthedataimportation,transmittinginfotoserver.Calculatinganddisplaytheresulttouser.Server:Generallyisadatabaseserver.Respondingclient,processingdateandreturningtheresulttoclientAlongwiththecontinuouslyextendingofapplicationandthedevelopmentofnetwork,thisconstr
3、uctionbringssomeobviouslyproblems,expressingatbelowseveralaspect:a.Asclienttierandservertierdevelopindependentlywithoutcontacting,thewholesystemrunsinlowerreliability.b.Astheclienthastoinstallmanyapplicationprograms,maintenanceexpendsmuch.c.Iftheclienttierextends,itneedsabette
4、rmachine.Itmaywastemanyresources.Fromaboveanalysis,withthecontinuouslyenlargeofbusinessenterpriseandincreaseofapplication,thetraditional2tierconstructionishardtoadaptbecauseofit'stowexpansibility、highmaintenancecost、lowdatasafety、anddifficultiesofcommunicating.Underthisbackgro
5、und,threetierconstructionsemergedwiththetideofthetimes.Presentationtier(webserver):Itisresponsibleforintercommunicationwithusersandpresentationofdata,collectsdataforfurtherhandling,requestscorebusinesslogicservicefromapplicationtierandhandlestheresult-Applicationtier:Thesecomp
6、onentsaremanagedbythemiddleware.Itrealizescorebusinesslogicandbroadcastsservice,managesandacceptsclientsrequests,transmitsindicationswhichoperatedatatoresourcesmanager,andthenreturnstheresulttotheclientorotherservers.Datatier(resourcemanager):Commonlyisrelationshipdatabase.Iti
7、sresponsiblefordataresources.Itcompletesthedataoperation.Duringtheserviceprocess,servicecomponentsaccessdatabasecontrolledbyresourcesmanageroraskingresourcemanagerforservice.3-tieraddstheapplicationserveronthetraditional2-tier.Andmanagesthebusinesslogicseparately,frombutmakest
8、heclientinterfaceandbusinesslogiclocateindifferenttiers.Their