利用ASP开发Web应用程序.docx

利用ASP开发Web应用程序.docx

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利用ASP开发Web应用程序

UsingASPdevelopWebapplications

ENGLISHE：

DevelopWebapplicationprogramusingASPthearchitecturethatmustfirstestablishWebapplication.Nowinapplicationfrequentlywithtohavetwo:

ThearchitectureofC/SandthearchitectureofB/S.

Client/serverandcustomerend/serverholdthearchitectureofC/S.

Thecustomer/serverstructureoftwofloor.

Customer/server（Client/Server）modelisakindofgoodsoftwarearchitecture,itistheoneofbestapplicationpatternofnetwork.Fromtechnology,seethatitisalogicconcept,denotewillaapplicationmanytasksofdecomposingdifferencecarryout,commoncompletionisentiretoapplythefunctionoftask.Oneachnetworkmaincomputerofwebsite,resource（hardware,softwareanddata）divideintostep,isnotbalanced,undercustomer/serverstructure,withouttheclientcomputerofresourcethroughsendingrequesttotheserverthathasresource,getresourcerequest,someettheresourcedistributioninnetworknotbalancedness.Withthiskindofstructure,cansynthesizevariouscomputerstocooperatewithwork,letiteachcan,realizethescaleforthesystemofcomputeroptimization（Rightsizing）withscalereducetomelt（Downsizing）.Pictureisasfollows:

Itismostoftodivideintocomputernetworkapplicationintotwo,inwhichtheresourceandfunctionthatpartsupportsmanyuserstoshare,itisrealizedbyserver;Anotherpartfaceseveryuser,isrealizedbyclientcomputer,alsonamely,clientcomputerisusualtocarryoutprosceniumfunction,realizesman-machineinteractionthroughuserinterface,oristheapplicationprogramofspecificconducteduser.Andserverusuallycarriesoutthefunctionofbackstagesupporter,managestheoutsiderequestconcerningsetingup,acceptingandreplyinguserthatshared.Foracomputer,itcanhavedoublefunction,isbeingcertainandmomentarytocarvetoactasserver,andagainbecomesclientcomputerinanothertime.

Customer/servertypecomputerdivideintotwokinds,onesidewhooffersserviceiscalledasserver,asksonesideofservicetobecalledascustomer.Tobeabletoofferservice,serveronesidemusthavecertainhardwareandcorrespondingserversoftware;Also,customeronesidemustalsohavecertainhardwareandcorrespondingcustomersoftware.

Theremustbeaagreementbetweenserverandcustomer,bothsidescommunicateaccordingtothisagreement.

Applycustomer/servermodelinInternetservice,therelationbetweencustomerandserverisnotimmutable.SomeInternetnodeoffersserviceontheonehand,alsogetsserviceontheotherhandfromothernode;Itiseveninonetimedialoguecourse,mutualrolealsoexchangesprobably.Asincarryoutfiletransmission,ifbecalledasonesidewhooffersfileserver,iscalledasonesidewhogetsfilecustomer,whenusinggetormgetordersinceanothernodetakesfile,canthinkthatwhatselfuseanditisclientcomputer,isusingputormputordertoanothernodedispatchfilecanagainthinkthemachinethatusedselfisserver.

Multilayercustomer/serverstructure

Alongwiththedevelopmentofenterpriseapplication,recently,haveagainarisenakindofnewmultilayerarchitecture,itappliescustomerendtodivideintotwominutes:

Customerapplicationandserverapply.Customerapplicationisthepartoforiginalcustomerapplication,isanotherandpartialtohavebeentransferedtoservertoapply.Newcustomerapplicationtakestheresponsibilityforuserinterfaceandsimpleregularbusinesslogicandnewserverapplicationresidentcore,changeablebusinesslogic.Thereforeitsstructurehasbecomenew（Clientapplication+Serverapplication）/Serverstructure.Followingpictureshows:

ThiskindofstructurehassolvedtraditionalClient/Servercanexpandproblem,havereducedcustomerendbusinesslogic,andhavereducedtherequirementofcustomerendforhardware.Atthesametimebecauseofalotofbusinesslogicconcentrationshavegonetounitaryapplicationserveron,themaintenanceworkofapplicationsystemhadbeenalsoconcentratedtogether,haveeliminatedtheprobleminthetraditionalstructureofClient/Serverthatsoftwaredistributes.ThiskindofstructureiscalledasthearchitectureofB/S.

Browser/Serverandbrowser/serverholdthearchitectureofB/S.Onessence,Browser/ServerisalsoakindofstructureofClient/Server,itisakindoffromthetraditionaltwolevelsofstructuraldevelopmentofClient/Servercometothethree-layerstructuralspecialcaseofClient/ServerthatappliedonWeb.

InthesystemofBrowser/Server,usercanpassthroughbrowsertoalotofserversthatspreadonnetworktosendrequest.ThestructureofBrowser/Serverismaximumtohavesimplifiedtheworkofclientcomputer,onclientcomputer,needtoinstallanddeployfewcustomerendsoftwareonly,serverwillbearmorework,fordatabasevisitandapplyprogramcarryoutwillinserverfinish.

Underthethree-layerarchitectureofBrowser/Server,expresslayer（Presentatioon）,functionlayer（BusinessLogic）,datalayer（DataService）havebeencuttheunitof3relativeindependences:

Itisthefirstlayeroftoexpresslayer:

Webbrowser.

Inexpressinglayercontainsystemshowlogic,locateincustomerend.It'staskistosuggestbyWebbrowsertothecertainaWebserveronnetworkthatserviceisasked,afterverifyingforuseridentity,WebserverdeliversneededhomepagewithHTTPagreementtocustomerend,clientcomputeracceptthehomepagefilethatpassed,andshowitinWebbrowseron.

Secondlayerfunctionlayer:

HavetheWebserveroftheapplicationfunctionofprogramextension.

Infunctionlayercontainthesystematichandlingofgeneralaffairslogic,locateinWebserverend.It'staskistherequestconcerningacceptinguser,needtobefirstconductedandcorrespondingtoexpandapplicationprogramanddatabasetocarryoutconnection,passesthroughthewaiessuchasSQLtodatabaseservertoputforwarddatahandlingtoapplyfor,thenetc.databaseservertheresultofhandlingdatasubmittoWebserver,deliveragainbyWebservertoreturncustomerend.

Thenumberofpliesof3thaccordingtolayer:

Databaseserver.

Indatalayercontainsystematicdatahandlinglogic,locateindatabaseserverend.It'staskistoaccepttherequestthatWebservercontrolsfordatabase,realizationisinquiredandmodifiedfordatabase,updateetc.function,submitoperationresulttoWebserver.

Carefulanalysisisbeeneasytosee,thearchitectureofBrowser/Serverofthree-layeristhehandlingofgeneralaffairsofthetwolevelsofstructureofClient/Serverlogicmodularfromthetaskofclientcomputerinsplit,fromthefirstfloorofindividualcompositionbearthepressureofitstaskandsuchclientcomputerhavealleviatedgreatly,distributeloadbalancedlyandhavegivenWebserver,sofromthestructuralchangeofClient/serveroforiginaltwofloorthestructureofBrowser/Serverofthree-layer.Thiskindofthree-layerarchitecturefollowingpictureshows.

Thiskindofstructurenotonlyclientcomputerfromheavyburdenandtherequirementofperformancethatrisescontinuouslyforitinliberationcomeout,alsodefendtechnologypeoplefromheavymaintenanceupgradingworkinfreeoneself.Sinceclientcomputerhandlesgeneralaffairs,logicpartialminuteshavegivenfunctionserver,makeclientcomputerrightoff"slender"alotof,donottaketheresponsibilityforhandlingcomplexcalculationanddataagainvisitetc.crucialgeneralaffairs,isresponsibletoshowpart,so,maintenancepeopledonotrushaboutagainforthemaintenanceworkofprogrambetweeneveryclientcomputer,andputmajorenergyintheprogramonfunctionserverupdatework.Betweenthiskindofthree-layerstructurallayerandlayer,themutuallyindependentchangeofanyfirstfloordoesnotaffectthefunctionofotherlayer.IthaschangedthedefectofthetwolevelsofarchitectureofClient/Serveroftraditionfromfoundation,itisthetransformwithdeeponceinapplicationsystematicarchitecture.

Thecontrastoftwoarchitectures

ThearchitectureofBrowser/ServerandthearchitectureofClient/ServercomparewithalladvantagesthatnotonlyhavethearchitectureofClient/ServerandalsohavethearchitectureofClinet/Servertheuniqueadvantagethatplacedoesnothave:

Openstandard:

ThestandardadoptedbyClient/Serveronlyindepartmentunificationforbut,it'sapplicationisoftenforspecialpurpose.

Itislowertodevelopanddefendcost:

ItneedtobeimplementedonallclientcomputersthattheapplicationofClient/Servermustdevelopthecustomerendsoftwareforspecialpurpose,nomatterinstallationanddispositionescalatestill,havewastedmanpowerandmaterialresourcesmaximumly.TheapplicationofBrowser/Serverneedincustomerendhavegeneralbrowser,defendandescalatetoworkinserverendgoon,neednotcarryoutanychangeascustomerholds,havereducedthecostofdevelopmentandmaintenancesogreatly.

Itissimpletouse,interfacefriendly:

TheinterfaceoftheuserofClient/Serverisdecidedbycustomerendsoftware,interfaceandthemethodofitsusearenotidenticaleach,perpopularizeasystemofClient/Serveraskuserstudyfromthebeginning,ishardtouse.TheinterfaceoftheuserofBrowser/Serverisunifiedonbrowser,browseriseasytouse,interfacefriendly,mustnotstudyuseagainothersoftware,theuseofaLaoYongYithathassolveduserproblem.

Customerenddetumescence:

ThecustomerendofClient/Serverhasthefunctionthatshowsandhandlesdata,astherequirementofcustomerendisaclientcomputer"itisfat"veryhigh.ThecustomerofBrowser/Serverhol