本科毕业设计(论文)外文翻译--学生信息管理系统

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1、本科毕业设计(论文)外文翻译（附外文原文）系(院)：信息科学与工程学院课题名称：学生信息管理系统专业(方向)：计算机科学与技术（应用）班级：计本06-1班学生：赵兴哲指导教师：董明刚日期：2010年4月7.1EnterActionMappingsTheModel2architecture(seechapter1)encouragesustouseservletsandJava-ServerPagesinthesameapplication.UnderModel2,westartbycallingaservlet.Theservlethandlesth

2、ebusinesslogicanddirectscontroltotheappropriatepagetocompletetheresponse.Thewebapplicationdeploymentdescriptor(web.xml)letsusmapaURLpatterntoaservlet.Thiscanbeageneralpattern,like*.do,oraspecificpath,likesaveRecord.do.SomeapplicationsimplementModel2bymappingaservlettoeachbusine

3、ssoperation.Thisapproachworks,butmanyapplicationsinvolvedozensorhundredsofbusinessoperations.Sinceservletsaremultithreaded,instantiatingsomanyservletsisnotthebestuseofserverresources.Servletsaredesignedtohandleanynumberofparallelrequests.Thereisnoperformancebenefitinsimplycreat

4、ingmoreandmoreservlets.Theservlet’sprimaryjobistointeractwiththecontainerandHTTP.Handlingabusinessoperationissomethingthataservletcoulddelegatetoanothercomponent.StrutsdoesthisbyhavingtheActionServletdelegatethebusinessoperationtoanobject.Usingaservlettoreceivearequestandroutei

5、ttoahandlerisknownastheFrontControllerpattern[Go3].Ofcourse,simplydelegatingthebusinessoperationtoanothercomponentdoesnotsolvetheproblemofmappingURIs[W3C,URI]tobusinessoperations.OuronlywayofcommunicatingwithawebbrowseristhroughHTTPrequestsandURIs.ArrangingforaURItotriggerabusi

6、nessoperationisanessentialpartofdevelopingawebapplication.Meanwhile,inpracticemanybusinessoperationsarehandledinsimilarways.SinceJavaismultithreaded,wecouldgetbetteruseofourserverresourcesifwecouldusethesameActionobjecttohandlesimilaroperations.Butforthistowork,wemightneedtopas

7、stheobjectasetofconfigurationparameterstousewitheachoperation.Sowhat’sthebottomline?ToimplementModel2inanefficientandflexibleway,weneedto:EnterActionMappings19528_Routerequestsforourbusinessoperationstoasingleservlet_Determinewhichbusinessoperationisrelatedtotherequest_Loadamul

8、tithreadedhelperobjecttohandlethebusinessoperation_Pas