J2EE应用中英文对照外文翻译文献Word下载.docx

J2EE应用中英文对照外文翻译文献Word下载.docx

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OneprefacealongwiththeJavatechniqueofgradualmatureandperfect,Beestablishmentbusinessenterpriseclassapplicationofstandardterrace,theJ2EEterracegotsubstantialofdevelopment.SeveraltechniqueaskedforhelpfromtoincludeintheJ2EEnorm:

EnterpriseJavaBean（EJB）,JavaServlets（Servlet）,JavaServerPages（JSP）,JavaMessageService（JMS）...etc.,developmentmanyapplicationsystem.But,alsoappearedsomeprobleminthetraditionJ2theEEtheapplicationofthedevelopmenttheprocess:

1）theantinomyofofdatamodelandlogicmodel.Currentlythedatabaseofusagebasicallyandallisrelationtypedatabase,buttheJavabeessentiallyakindofthelanguagewhichfacetoobject,objectatsavingwithreadusageSQLandJDBCcarryonadatabaseoperationandloweredplaitdistanceofefficiencyandsystemofcanmaintenance;

2）traditionofJ2EEapplicationmuchtheadoptionisaccordingtotheEJBheavyweightframe,thiskindofframesuitablefordevelopalargebusinessenterpriseapplication,butusagetheEJBcontainercarryondevelopmentandadjusttotrytoneedtobewasteagreatdealoftime.ForloweringtheOuofcodetomatchsex,exaltationsystemofdevelopmentefficiency,thistextputforward1kindEEaccordingtotheJ2oftheStrutsframeandSpringframeandtheHibernateframeapplicationdevelopmentstrategy.

2、UsetheStrutsrealizationMVCstructure

usetheStrutsrealizationMVCstructureMVC（Model-View-Controller）isputforwardbytheTrygveReenskaug,firstdriveapplicationintheenvironmentSmallTalk-80,ismanytohandoverwitheachotherwithinterfacesystemofconstitutefoundation.Accordingtotheneedofvariableoftheinterfacedesign,MVChandoverwitheachotherconstituteofsystemtoresolveintomodelandseediagram,controllerthreepart.Model（Model）issoftwareprocessingproblemlogicatindependenceinoutsidemanifestationundercontentsandformcircumstanceofinsideabstract,packedthecoredata,logicofproblemandfunctionofcalculationrelation,independenceinconcreteofinterfaceexpressionandI/Ooperation.Seediagram（View）meaninformationandparticularformdemonstrationofmodeldataandlogicrelationandappearancetothecustomer.Itacquireamanifestationinformationfromthemodel,therecanbemanyforhomologyofinformationdissimilarityofmanifestationformorseediagram.Thecontroller（Controller）isaprocessingthecustomerhandoverwithsoftwarewitheachotheroperationof,itsjobiscontrolprovidemodelinanyvarietyofdissemination,insureacustomerinterfaceamongthemodelofrightnessshouldcontact;

Itacceptacustomerofimportation,give°

theimportationfeedbackmodel,thenrealizationcomputemodelcontrol,ismakemodelandseediagramtomoderateworkofparts.Usually1seeadiagramrightnessshouldacontroller.Model,seeseparateofdiagramandcontroller,makeamodelbeabletohavemanymanifestationtoseediagram.Ifthecustomerpassacertainseethecontrollerofdiagramchangethedataofmodel,allotherdependenceintheseseeofdatadiagramallshouldreflectionarrivethesevariety.Whenthereforeandregardlessoccurrencewhatdatavariety,controllerallwouldvarietynoticeallyseediagram,causemanifestationofrenewal.Thisisactuallyakindofvarietyofmodel-disseminationmechanism.

TheStrutsframeistobetheitemofApacheJakartatoconstituteparttopublishlucktodoattheearlieststage,itinheritedMVCofeachitemcharacteristic,anddidaccordingtothecharacteristicsofJ2EEcorrespondofvarietywithexpand.TheStrutsframewasgoodtocombineJsp,JavaServlet,JavaBean,Taliaetc.technique.IntheStruts,whattoundertakethecontrollerroleintheMVCbeanActionServlet.TheActionServletisaningeneralusecontrolmodule.ThiscontrolmoduleprovidedaprocessingallHTTPclaimwhichsendoutStrutsofentrancepoint.Itsinterceptionwithdistributetheseclaimtoarrivecorrespondofactiontype.（theseactionalloftypeisActionsontype）MoreoverthecontrolmoduleisalsoresponsibleforusingtocorrespondofclaimtheparameterfillActionForm（FromBean）,andpassactiontype（ActionBean）.Actiontypethebusinesslogicoftheinterviewcore,theninterviewJavaBeanoradjusttouseEJB.Endactiontypecontrolthepowerpassfollow-upofJSPdocument,fromJSPdocumentbornseediagram.AllthesecontrollogicmakeuseofStruts-config.xmlthedocumentcometoallocation.SeediagramintheStrutsframemainfromJSPbornpagecompletion,theStrutsprovideabundantofJSPlabeldatabase,thisisadvantageoustoseparatingperformancelogicandprocedurelogic.Themodeliswith1ortheformexistenceofseveralJavaBean.IntheStruts,mainexistencethreekindsofBean,respectivelyBE:

Action,ActionForm,EJBperhapsJavaBean.TheStrutsframehavenoconcretedefinitionmodellayerofrealization,inactuallythedevelopment,modellayerusuallyisclosewithbusinesslogicconnectwitheachother,andwanttocarryonoperationtothefirstfloordata.Theunderneath'

sintroductionisakindofdevelopmentstrategy,leadtheHibernateintothemodellayerofStrutsframe,usageittocarryonadatatopackwithreflecttoshoot,provideholdoutforlongtimeturnofsupport.4usageHibernateandtheStrutsdevelopmentJ2EEapplication4.1systemstructurediagram3manifestationaccordingtoHibernateandStrutsdevelopmentstrategyofsystemstructurediagram.

3、SpringtheApplicationFramework

Springisn'

tparticularlyawebframeworkbutagenericlightweightapplicationframeworkwithdedicatedwebsupport,andshowthearchitecturaldifferencestoStrutsandWebWork.IncontrasttoStrutsorWebWork,Springisanapplicationframeworkforalllayers:

Itoffersabeanconfigurationfoundation,AOPsupport,aJDBCabstractionframework,abstracttransactionsupport,etc.Itisaverynon-intrusiveeffort:

YourapplicationclassesdonotneedtodependonanySpringclassesifnotnecessary,andyoucanreuseeverypartonitsownifyouliketo.Fromitsverydesign,theframeworkencouragescleanseparationoftiers,mostimportantlywebtierandbusinesslogic:

e.g.thevalidationframeworkdoesnotdependonwebcontrollers.Majorgoalsarereusabilityandtestability:

Unnecessarycontainerorframeworkdependenciescanbeconsideredavoidableevils.

Ofcourse,Spring'

sownwebsupportisnicelyintegratedwiththeframework'

sgeneralpatterns.Nevertheless,replacingthewebsolutionwithStruts,WebWork,orthelikeiseasy.BothwithSpring'

swebsupportoradifferentone,Springallowsforbuildingatruededicatedmiddletierinthewebcontainer,withtheoptiontoreuseexactlythesamebusinesslogicintestenvironmentsorstandaloneapplications.AndwithinJ2EE,yourbusinesslogicwillnotunnecessarilydependoncontainerserviceslikeJTAorEJB-allowingcomplex,well-architectedwebapplicationstorunina"

simple"

containerlikeTomcatorResin.NotethatSpringdoesn'

tgenerallyaimtocompetewithexistingsolutions.ItratherfostersseamlessintegrationwithstandardslikeServlet,JSP,JTA,JNDI,JDBC,andJDO,andwell-suitedtoolslikeHibernate,Velocity,Log4J,andCaucho'

sHessian/Burlap.Theframeworkisdesignedtogrowwiththeneedsofyourapplications,intermsoftechnologychoice:

Forexample,youwillprobablyuseJTAviaSpring'

sJtaTransactionManagerifyouneeddistributedtransactions-butonlythen,asthereareperfectreplacementsforsingledatabases,likeDataSourceTransactionManagerorHibernateTransactionManager.

4、TheDesignofSpring'

sWebFramework

Spring'

swebframeworkisdesignedaroundaDispatcherServletthatdispatchesrequeststohandlers,withconfigurablehandlermappings,viewresolution,andlocaleandthemeresolution.ThedefaulthandlerisaverysimpleControllerinterface,justofferinga"

ModelAndViewhandleRequest（request,response）"

method.Thiscanalreadybeusedforapplicationcontrollers,butyouwillprefertheincludedimplementationhierarchy,consistingofAbstractController,AbstractCommandController,MultiActionController,SimpleFormController,AbstractWizardFormController.Applicationcontrollerswilltypicallybesubclassesofthose.Notethatyoucanchooseanappropriatebaseclass:

Ifyoudon'

thaveaform,youdon'

tneedaFormController.ThisisamajordifferencetoStruts.

Youcantakeanyobjectascommandorformobject:

There'

snoneedtoimplementaninterfaceorderivefromabaseclass.Spring'

sdatabindingishighlyflexible,e.g.ittreatstypemismatchesasvalidationerrorsthatcanbeevaluatedbytheapplication,notassystemerrors.Soyoudon'

tneedtoduplicateyourbusinessobjects'

propertiesasStringsinyourformobjects,justtobeabletohandleinvalidsubmissions,ortoconverttheStringsproperly.Instead,it'

softenpreferabletobinddirectlytoyourbusinessobjects.ThisisanothermajordifferencetoStrutswhichisbuiltaroundrequiredbaseclasseslikeActionandActionForm-foreverytypeofaction. 

ComparedtoWebWork,Springhasmoredifferentiatedobjectroles:

ItsupportsthenotionofaController,anoptionalcommandorformobject,andamodelthatgetspassedtotheview.Themodelwillnormallyincludethecommandorformobjectbutalsoarbitraryreferencedata.Instead,aWebWorkActioncombinesallthoserolesintoonesingleobject.WebWorkdoesallowyoutouseexistingbusinessobjectsaspartofyourform,butjustbymakingthembeanpropertiesoftherespectiveActionclass.Finally,thesameActioninstancethathandlestherequestgetsusedforevaluationandformpopulationintheview.Thus,referencedataneedst