学生考勤管理系统的设计和实现外文翻译(共8页).docx

学生考勤管理系统的设计和实现外文翻译(共8页).docx

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DesignandImplementation oftheManagementSystem forStudentsAttendance

As forthedevelopmentofinformationtechnologyandeconomic,computerandnetworkingapplicationsbecomeincreasinglycommon.Withtheschoolinformationalconstructioninputsareconstantlyincreasing,theconstructionofcampusnetworkaccessestospacedevelopment.Networkshavegraduallyinfiltratedintotheschoolmanagement,teachingandotherareas.Forexample:

Acomprehensiveeducationsystemwhichutilizesinformationtechnologyofthenetworktocarryoncollegecoursetoeducate,itoffersfromthenetworkclassroom,essentialstudylinksdiscussing,answeringquestions,andprocessinghomeworktoexaminationtoteachersandstudents.

The ManagerSystemforStudentsAttendance isasystemwhichcanhelpexchangeinformationbetweentheschoolandstudents.Aswe know,Inthehighschools,students’jobofcheckonworkattendancenotonlyworkloadisverylarge,butalsotimeisverystrong.Inthepastmanyhighschoolscarrythroughmanagingbysigninginandreportingforms,efficiencyanddiaphaneityarenotgood,andeasymakeamistake,too.Alongwithdevelopmentofdatabasetechnologyandprogressofcorporationinformation’sbuilding,usingcomputertomanagecheckonworkattendanceofcorporationswhichitisnecessary.Itsavesamassofmanpowerandmaterialresourcesandgreatlylightensworkloadofemployees.Thesystemisaninformationsystemdesignedforaskingforleaveonline forstudentsandmanaging attendanceofundergraduate.Itisgenerallydividedintothreemainmodules:

themoduleforaskingforon-lineleave,themoduleformanagingattendanceofundergraduateand themodule forbackstagemanagement.Therearedifferentcustomers intheuniversityoperating thesystem,suchas student,teacher, ateacherinchargeofaclass,departmentleader,schoolleader,administrator.Administratorshavethehighestauthority.Teachershaveanauditandinquiryauthority.Studentsonlyprovidewithcompetence.

The systemisbasedonBrowser/Server（browser/server）structureanddevelopedbyJSPlanguageandMySQLdatabase.ItalsousesTOMCATasaserver.Thesystemiswrittenbythelanguage:

HTMLandJAVA.Thekeytechniquesusedintheprocessofdevelopmentare:

thepagemodularization,dynamicgeneratingandstaticpageshowingofinformation,etc.Andthethesisfocusesontheintroductionofthesystem’sattendancemanagementandthemanagementofaskingforleaveonline.Anditdevelopsthefunctionofstudent,teacher,ateacherinchargeofaclass,departmentleader,schoolleaderonthewhole.Itincludedthewholedesignofsystem,logicframe,dataflow,partitionofeveryfunctionmodule,designofsystemfunctionmodulesandconcreterealizationandsoon.

Constructing theattendancesystembasedonMVCisthetypicalcasethatusesJSP-Action-JAVABANtodevelopthewebsite,itinvolvestotheMVCdesignpattern,aswellasthebackstagedatabase,thetiedoperationbetweenthefundamentaltableandthesystemdownstage,thissystemthroughtheJDBCgaindatabaseactuationtotieupthefundamentaltable inthedatabaseandthedownstagesystem.Toconstructthesystemintheprocess,IuseMYECLIPSEtomakethesoftwaredevelopmentkitofmysystembackstage，usesDREAMWEAVERtomakethesoftwaredevelopmentkitofmydownstagehomepage.

Implementation ofasystemisboundtoapplytodifferentresources,andtechnology.So,let'sdiscussthisappraisalsystemundertheuseoftechnologyintheapplicationofconceptsandresources:

MVC andUserInterfaces　MVCwasfirstpopularizedwithSmalltalkandisnowusedinmanymodernuserinterfaceframeworks.OneoftheprimarybenefitsofMVCisthatitprovidesreusablecomponentsforinteractiveuserinterfaces.SwingdoesthisadmirablyforrichJavaclients,whileStrutsdoessotoalesserextentontheWeb.EventhoughtheintroductionofTilestoStrutsprovidesmorereuse,thecomponentsarestillmorepage-centricasopposedtoSwing'smorefine-grainedwidget-centricapproach.LikeStruts,JSFistargetedatJavaWebapplications,butmovesclosertoSwingwithitsconcentrationonreusableuserinterfacewidgets（orcomponents）.

MVCPattern　 WebeginbydescribingthetraditionalformofMVCandthendiscusshowithasbeenadaptedfortheWeb.Eachofthethreeframeworksisthenexamined,andtheirrespectiveimplementationsofthiscommonpatternareuncovered.Theintentofthispatternistopartitioninteractiveapplicationsintothreeseparatecomponents:

Model,View,andController.TheModelrepresentscoreapplicationdataandfunctionallogic,theViewrendersthedataanddisplaysittousersoftheapplication,andtheControllerhandlesuserinteractionorinput.Allthreecomponentscommunicateviaachange-propagationmechanismtostaysynchronized.

SQLDatabases　 SQLdatabaseisatypeofdatabasetechnologythatisthemostwidelyusedintoday'scomputingenvironment.Herethedataisstoredinaverystructuredformatthatprovideshighlevelsoffunctionality.SQLdatabasesaregenerallymorerobust,secureandhavebetterperformancethanotherolderdatabasetechnologies.ItprovidesforSQLaccesstothedata.SoitisimportanttounderstandthetermSQLbeforeweproceedfurther.

SQL　 SQLisusedtocreate,maintain&queryrelationaldatabasesandusesregularEnglishwordsformanyofitscommands,whichmakesiteasytouse.Itisoftenembeddedwithinotherprogramminglanguages.AfundamentaldifferencebetweenSQLandstandardprogramminglanguagesisthatSQLisdeclarative.Youspecifywhatkindofdatayouwantfromthedatabase;theRDBMSisresponsibleforfiguringouthowtoretrieveit.

JSP

Putsuccinctly,JAVAServerPagesisatechnologyfordevelopingwebpagesthatincludedynamiccontent.UnlikeaplainHTMLpage,whichcontainsstaticcontentthatalwaysremainsthesame,aJSPpagecanchangeitscontentbasedonanynumberofvariableitems,includingtheidentityoftheuser,theuser'sbrowsertype,informationprovidedbytheuser,andselectionsmadebytheuser.

AJSPpagecontainsstandardmarkuplanguageelements,suchasHTMLtags,justlikearegularwebpage.However,aJSPpagealsocontainsspecialJSPelementsthatallowtheservertoinsertdynamiccontentinthepage.JSPelementscanbeusedforavarietyofpurposes,suchasretrievinginformationfromadatabaseorregisteringuserpreferences.WhenauserasksforaJSPpage,theserverexecutestheJSPelements,mergestheresultswiththestaticpartsofthepage,andsendsthedynamicallycomposedpagebacktothebrowser.

S2SH

DAOlayerisresponsibleforinteractionwithpersistentobjects.Thislayerencapsulatesthedata,add,delete,check,changeoperation.

AtypicalJ2EEthree-tierstructure,dividedintothepresentationlayer,middlelayer（businesslogic）anddataserviceslayer.Three-tiersystem,thebusinessrules,dataaccessandverifythelegitimacyofsuchworkontheintermediatelayerprocessing.Clientsdonotdirectlyinteractwiththedatabase,butbythemiddletiercomponentsandestablishconnections,thenthemiddletieranddatabaseinteraction.

S2SHframework

AtypicalJ2EEthree-tierstructure,dividedintothepresentationlayer,middlelayer（businesslogic）anddataserviceslayer.Three-tiersystem,thebusinessrules,dataaccessandverifythelegitimacyofsuchworkontheintermediatelayerprocessing.Clientsdonotdirectlyinteractwiththedatabase,butbythemiddletiercomponentsandestablishconnections,thenthemiddletieranddatabaseinteraction.

JSPpresentationlayeristhetraditionaltechnology,sinceitsinceptionin1999,afteryearsofdevelopment,itswideapplicationandstableperformance,asthepresentationlayertechnologyforlayingasolidfoundation.

ThemiddlelayeristhepopularSpring+Hibernate,inordertocontroltheseparationlayerandbusinesslogiclayer,furtherdividedintothefollowing.

WebtieristheMVCpatterninsidethe"C"（controller）,controlsthebusinesslogicandpresentationlayerofinteraction,calledbusinesslogiclayer,andbusinessdatabacktothepresentationlayerfororganizationalperformance,thesystemusingStrutsMVCframework.

Servicelayer（iebusinesslogic）,isresponsibleforachievingbusinesslogic.BusinesslogictoDAOlayerbasedonthepositivemodeDAOcomponentpackaging,completesystemrequiresbusinesslogic.

DAOlayerisresponsibleforinteractionwithpersistentobjects.Thislayerencapsulatesthedata,add,delete,check,changeoperation.

PO,persistentobject.Throughtheentity-relationalmappingtoolfordatarelationaldatabasemappingobjects,itiseasytorealizeobject-orientedwayofoperatingthedatabase,thesystemusesHibernateastheORMframework.

Spring'srolethroughouttheentiremiddlelayer,theWeblayer,Servicelayer,DAOlayerandPOseamlessintegrationofitsdataserviceslayerisusedtostoredata.

Agoodframeworkthatallowsdeveloperstoreducethere-establishmentoftheburdenoftheprogramtosolvecomplexproblemsandenergy;itcanbeextendedtothecustom-house;andhasastrongusercommunitytosupportit.Usuallyagoodframeworktosolveaproblem.However,yourapplicationislayered,eachlayermayneedtheirownframework.OnlysolvetheUIproblemdoesnotmeanyoucanbegoodbusinesslogicandpersistencelogic,andUIcomponentsofagoodcoupling.

First，Developmentefficiency:

theuseofstrictJ2EElayeredarchitecture,canbeavoidedwhenasimplebuttonchangesthepagewilldamagethesystem.Changestothepresentationlayerifanerroroccurs,itwillnotbeextendedtobusinesslogicerrors,butwillnotaffectthepersistencelayer.Therefore,theuseofJ2EElayeredarchitecture,evenifthepre-development