中英文翻译土木R101李成武.docx

中英文翻译土木R101李成武.docx

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中英文翻译土木R101李成武

外文原文

ResearchonsoftwaredevelopmentplatformbasedonSSH

frameworkstructure

Abstract

Theresearchofsoftwaredevelopmentplatformisacomplexsystemengineering.ForthecurrentproblemsinthefieldofWebapplicationdevelopment,usecomputerrelatedtechnology,combinewiththemorepopularopensourceframeworkSSH,researchthesoftwaredevelopmentplatformthatbasedonSSHframeworkconstruction.Basedontheanalysisoftheexistingproblemsofsoftwaredevelopment,emphaticallystudiesthekeytechniquesofSSHframeworkplatform,includingthepresentationlayerframeworkStruts,businesslogicframeworkSpring,datapersistencelayerframeworkHibernate,J2EEframeworkintegratedthenewSSHandsoon.TheresearchcontentofthisarticleappliedtolargeWebprogramdevelopmententerprise,itmakesforpromotingproductivityandimprovingsoftwarequality,andhasanimportantsignificanttopromotethedevelopmentofsoftwareindustryinChina.

©2011PublishedbyElsevierLtd.Selectionand/orpeer-reviewunderresponsibilityof[CEIS2011]

Keywords:

SSHframework;softwaredevelopmentplatform;Struts;Spring;Hibernate;

1.Introduction

Thedevelopmentoflargeenterprise-classWebapplicationsystemusuallyrequiresagoodsoftwarearchitecturetofacilitatethecollaborativedevelopmentexpansionandupgrading,butthetraditionaldevelopmentmodelcan'tmeettheserequirements.ForthecurrentproblemsinthefieldofWebapplicationdevelopment,followingtheprinciplesandmethodsofsystemsengineering,comprehensiveusesoftwareengineering,databasesystems,computernetworks,object-orientedtechnology,andsoftwareautomaticgenerationplatformbasedonB/SstructureofJavaframework,tohelpdevelopersbuildaWebapplicationsystemofclearstructure,goodreusabilityandeasymaintenanceintheshortterm.

Thedesignideaisrunningbythefrontendprogramthatfrontlargedatabasessupported,thecodeofsoftwaredevelopmentautomaticallycompletebycomputer,programmersdon'tneedtomasterJavaanddatabasetechnologywillbeabletodevelopbettersoftwaresystems.Translatethetraditionalcodingofsoftwaredevelopmenttosystemanalysis,reducesthetechnicalrequirementsforsoftwaredevelopers,improvethedevelopmentproductivityofsoftware,andchangesthetraditionalsoftwaredevelopmentmodel.

2.ProblemsinSoftwareDevelopment

Atthisstagetherearemanyproblemsinsoftwaredevelopment,mainlyinthefollowingareas[1]:

（1）Thephenomenaofsoftwaredevelopment"demandexceedssupply"effectsthedevelopmentofenterprises.Differentcompaniesneeddifferentsoftware,withoutauniversalsoftwarecanbeappliedtoeachenterprisemanagementinformationsystem.Softwaredevelopmentcycleislong,codeerrors,softwarereliabilityispoor,unfavorabletomaintainandupgrade.Theneedthatenterpriseforsoftwaremorecomplex,andthesoftwareprovidedbysoftwaredevelopmentcompaniesenterprisearenotsatisfied.

（2）Softwarequalityisunreliable,softwaremaintenanceispoor,userstypicallyarenotsatisfiedwiththecompletedsoftware.Softwareerrorisinevitable,andsoftwaretestingneedtospendalotoftime.Softwaremaintenancepersonnelnotonlyunderstandbusinessprocesses,butalsofamiliarwithsoftwaredevelopmenttechnology,tosolveabuginthesoftwaremayintroducenewbugs,andmanypeoplearenotwillingtoengageinsoftwareMaintenance.IfSoftwareoftenwrong,willcauseusers'dissatisfaction,andultimatelybeabandoned.

（3）Softwaredevelopmentpersonnelcan'tmeettheneedsofthemarket,theyneedtomastertoomuchknowledge.Softwaredevelopmentrequiresmaster:

databasetechnology,databaseaccesstechnologyandavarietyofdatabasemanagementsystems,networkandInternettechnology,developmenttoolsandrelatedstructuresandclasslibraries,softwaretestingandanalysistools,andmanyothertechnologies.Astheaccelerationoftechnicalupgrading,developersconstantlylearningnewtechniquewhilebebusyworking,theburdenistooheavy.

（4）Thefrequentflowofsoftwaredevelopershasagreatlosstothecompany.Softwareistheintellectualproductsofpeople,eachonehastheirownprogramminghabits,ideasandmethods.It'sverydifficulttoreadsomeone'sprogram.Ifthedevelopersleavetheprojecthalf-way,otherswilldifficulttotakeover,andevenleaveafterthedeliveryofsoftwareprojects,othersalsoverydifficulttomaintain.

（5）Softwaredon'thavetheappropriatedocument,thatcausedgreatdifficultiestothelatterpartofthedevelopment,maintenanceandreconstruction.Softwaredevelopmentshouldbefirsttowriteadocumentthenwritetheprogram,modifytheprogramaftermodifythedocument.Butsomedevelopersdonotdevelopgoodhabits;somebusytowriteormodifytheprogramandforgettomodifythedocument,resultingininconsistentwiththedocumentandprocedures;manysoftwaredevelopmentcompanieshavenoclearrequirementsinthequantity,qualityandformatofthedocument.

3.KeyTechnologyofSSHFrameworkPlatform

Thedevelopmentoflargeenterprise-classWebapplicationsystemusuallyrequiresagoodsoftwarearchitecturetofacilitatethecollaborativedevelopmentexpansionandupgrading,andthemorepopularopensourceframeworkSSH,isalightweightsolutiontodeveloptheWebapplicationsofenterprise-classJ2EE.Atpresent,themarkettherehavebeensomecommercial,opensourceapplicationframeworkthat

basedonJ2EE,inwhichthemainstreamframeworktechnologiesareStrutsframeworkbasedonMVCpatternandSpringframeworkbasedonIoCpatternandobject/relationsmappingframeworkHibernateandsoon[1].

3.1.PresentationLayerFrameworkStruts

ItistheMVCframeworkrealizedonthebaseofJSPModel,mainlydividedintothreepartsofModel,

ViewerandController,thedesignconceptisdecouplingperformancelogicandbusinesslogicthroughController,toimprovethemaintainability,scalabilityandreusabilityofsystem[2-4].ThearchitectureofStrutsframeworkshowninfigure1.

Fig1.ArchitectureofStrutsframework

View.ViewmajorcomprisestheJSPpage,thereisnoprocesslogic,businesslogicandmodelinformation,onlymark.StrutsitselfcontainsasetofTagLib,whichisalsooneoftheessence,flexiblyusecansimplifythecodeofJSPpagesandimprovethedevelopmentefficiency.

Controller.TheControllerinStrutsisActionServletmainlyprovidedbyitself.ActionServletreceivesallrequestsfromclientsandtransfersthecontroltotheappropriateActionaccordingtotheconfigurationfile（struts-config.xml）.

Model.Strutsdon'tdefinetheimplementationofspecificModellayer,Modellayerusuallycloselyrelateswithbusinesslogic,andhaspersistencerequirements.Atpresentincommercialareasandtheopensourceworld,bothhavesomeexcellenttoolsforfacilitatingthedevelopmentofModellayer.

3.2.BusinessLogicLayerFrameworkSpring

It'sapowerfullightweightframeworkthatsolutesmanycommonproblemsinJ2EEandcanreplaceEJBtechnology.LightweightrefershereistheSpringframeworkitselfratherthanmeansSpringcanonlybeusedforlightweightapplicationdevelopment[8].ThelightnessofSpringreflectsintheframeworkoftheirowninfrastructureandthesupportandassemblycapabilitiesforotherapplicationtools.ComparedwiththecolossusEJB,Springcanmakeprocessdevelopmentpersonnelreducetheriskthatbetweenthevarioustechniqueslevels.

Inthisway,withoutwritingfactorypattern,singlepattern,orotherconstructionmethod,candirectlytoobtainthenecessarybusinesscomponentsthroughthecontainer.ThestructureofSpringframeworkshowninfigure2.

Springframeworkconsistsofsevenwell-definedmodules,andeachmoduleorcomponentcanstandalone,

orrealizesjointwithoneormoremodules.SpringCoreContainerisusedtomanagetheIoCcontainerofbusinesscomponentof,isthecoreofSpringapplications;SpringDAOandSpringORMprovidesabstractionmoduleofdataaccess,alsointegratesonHibernate,JDOandiBatisandsopopularsupportforobject-relationalmappingframeworkModule,andprovidesabufferconnectionpooling,transactionprocessingandotherimportantservicesfunctiontoensurethesystemperformanceanddataintegrity;SpringWebmoduleprovidesanumberofabstractpackageofWebapplication,whichcanintegrateWebframeworksuchasStruts,WebWorkandSpringtotheirownsolutions.

3.3.DataPersistenceLayerFrameworkHibernate

O/RMappingtechnologyisgeneratedtosolvethecontradictionnotmatchbetweenrelationaldatabaseandobject-orientedprogramming.HibernateisthemostpopularO/RMappingframework,automaticmappingbetweenrelationaldatabaseandJavaobjects,thatprogrammerscanuseaverysimplewaytoachievedatabaseoperation.TheworkingprincipleofHibernateshowninfigure3.

HibernatethroughJDBCpackage,shieldstheunderlyingdatabaseoperations

toprogrammer,sotheprogrammerfocusonOOapplicationdevelopment,andimprovedevelopmentefficiency.TheworkprogrammersaccessthedatabaseisprepareXmlmappingfileforpersistentobject.

Changesintheunderlyingdatabasesimplychangetheinitialconfigurationfile

（hibernate.cfg.xmlorhibernate.properties）cannotaffecttheapplication.

Hibernatehasitsownobject-orientedquerylanguageHQL,HQLispowerfulandsupportsforthecurrentmostpopulardatabasessuchasOracle,DB2,MySQL,MicrosoftSQLServer,etc.,isthemostwidelyusedO/Rmappingtool.Hibernateprovidestheunderlyingsupportfortherapiddevelopmentapplication.

3.4.NewJ2EEFrameworkforIntegratedSSH

AnalyzedthethreeframeworktechnologybasedonJ2EE,thenimprovethetraditionalJ2EEWebdevelopmentmodelthroughintegrat