餐饮管理系统外文翻译文献Word文档下载推荐.docx
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餐饮管理系统外文翻译文献Word文档下载推荐.docx
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外文:
AComparativeStudyofWebApplicationDesignModels
UsingtheJavaTechnologies
Abstract.
TheServlettechnologyhasbeenthemostwidelyusedtechnologyforbuildingscalableWebapplications.Intheevents,therearefourdesignmodelsfordevelopingWebapplicationsusingtheJavatechnologies:
Model1,Model2,Struts,andJavaServerFaces(JSF).Model1employsaseriesofJSPpages;
Model2adoptstheModel-View-Controllerpattern;
StrutsisaframeworkemployingtheModel2designmodel;
andJSFisanewtechnologythatsupportsready-to-usecomponentsforrapidWebapplicationdevelopment.Model1isnotrecommendedformedium-sizedandlargeapplicationsasitintroducesmaintenancenightmare.Thispapercomparesandevaluatestheeaseofapplicationdevelopmentandtheperformanceofthethreedesignmodels(Model2,Struts,andJSF)bybuildingthreeversionsofanonlinestoreapplicationusingeachofthethreedesignmodels,respectively.
1Introduction
Today,Webapplicationsarethemostcommonapplicationsforpresentingdynamiccontents.ThereareanumberoftechnologiesforbuildingWebapplications,themostpopularofwhichistheServlettechnology.ThistechnologygainsitspopularityfromitssuperiorityoverothertechnologiessuchasCGIandPHP.Servletsarecumbersometodevelop,however,becausesendingHTMLtagsrequirestheprogrammertocomposethemintoaStringobjectandsendthisobjecttothebrowser.Also,aminorchangetotheoutputrequirestheservlettoberecompiled.Toaddressthisissue,SunMicrosystemsinventedJavaServerPages(JSP).JSPallowsHTMLtagstobeintertwinedwithJavacodeandeachpageistranslatedintoaservlet.AJSPpageisaservlet.However,compilationoccursautomaticallywhenthepageisfirstrequested.Asaresult,changingtheoutputdoesnotneedrecompilation.Inaddition,JSPenablestheseparationofpresentationfromthebusinesslogicthroughtheuseofJavaBeansandcustomtaglibraries.ThenormnowindevelopingJavabasedWebapplicationsistouseservletsalongwithJavaServerPages.
Inthelaterdevelopment,thereareanumberofdesignmodelsforbuildingservlet/JSPapplications:
Model1,Model2,Struts,andJSF.Model1andModel2werefirstmentionedintheearlyspecificationsofJSP.Model1strictlyusesJSPpages,withnoservlets,andModel2usesthecombinationofbothservletsandJSPpages.ThetermsofModel1andModel2havebeenusedeversince.Model1issuitableforprototypesandverysmallapplications,andModel2istherecommendeddesignmodelformediumsizedandlargeapplications.
AsModel2gainedmoreacceptancesintheindustry,anopensourceinitiativetobuildtheStrutsFrameworkwasinitiated.StrutsperfectsModel2byprovidingthecontrollerpartoftheModel-View-ControllerofModel2.Inaddition,Strutsprovidesbetterpagenavigationmanagementandseveralcustomtaglibrariesformorerapiddevelopment.Despiteitssteeplearningcurveandthefactthatitwasneverdefinedinanyspecification,StrutshasbeengainingpopularityasthealternativetoModel2.
JavaServerFacesisbuiltundertheJavaCommunityProcessunderJSR-127.SunMicrosystemsproposedthistechnologyinthehopethatJSFwillbetheultimatemodelforbuildingJavaWebapplications.ThemostimportantfeatureofJSFistheavailabilityofready-to-usecomponentssuchasextensibleUIcomponents,easypagenavigation,inputvalidators,dataconvertersandJavaBeansmanagement.
Theproblemfacingservlet/JSPprogrammersaretochoosethemostappropriatedesignmodel.Clearly,JSFprovidesabettersolutioninregardtodevelopmenttime.However,somepeoplearenotsanguinetoadoptthistechnologyforfearofperformancepenaltyduetotheoverheadoftheJSFimplementation.
WebuildthreeversionsofanonlinestoreapplicationnamedBuyDirectusingModel2,StrutsandJSF.Theparameterscomparedarethenumberoflinesofcode,thenumberofclasses,andtheperformancemeasurementresults.Weinvestigatewhichofthedesignmodelsallowsthemostrapiddevelopmentprocess.Weevaluatetheperformancesoftheapplicationsbuiltuponthesemodels.Weprovidesomesuggestionstoperfecttheexistingdesignmodelstomakedevelopmentmorerapid.
Therestofthepaperisorganisedasfollows.Section2discussestheissuesinWebdevelopment.Section3explainshowthethreedesignmodelsaddressthesedevelopmentissues.Section4providesthedetailsofthehardwareandsoftwareusedintheseexperiments.Section5presentstheexperimentresultsandanalysis.Section6reviewstherelatedwork.Section7concludesbyofferingsomesuggestionstoimprovetheexistingdesignmodels.
2JavaWebDevelopmentIssues
AllJavaWebdevelopmentusestheServlettechnologyastheunderlyingtechnology.Assuch,allJavaWebapplicat
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