网上车险理赔系统的设计与实现

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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