J2EE架构课程.ppt

NIIT高级讲师刘晓涛版权所有 J2EE架构讲师 刘晓涛Email lxt008 NIIT高级讲师刘晓涛版权所有 WhatIstheJ2EE Openandstandardbasedplatformfordeveloping deployingandmanagingn tier Web enabled server centric andcomponent basedenterpriseapplications NIIT高级讲师刘晓涛版权所有 TheJava2Platform NIIT高级讲师刘晓涛版权所有 TheJava2Platform NIIT高级讲师刘晓涛版权所有 CommunicationPatterns NIIT高级讲师刘晓涛版权所有 EvolutionofEnterpriseApplicationFrameworks SingletierTwotierThreetierRPCbasedRemoteobjectbasedThreetier HTMLbrowserandWebserver NIIT高级讲师刘晓涛版权所有 SingleTier Mainframe based Centralizedmodel asopposeddistributedmodel DumbterminalsaredirectlyconnectedtomainframePresentation businesslogic anddataaccessareintertwinedinonemonolithicmainframeapplication NIIT高级讲师刘晓涛版权所有 SingleTier Pros Cons Pros NoclientsidemanagementisrequiredDataconsistencyiseasytoachieveCons Functionality presentation datamodel businesslogic intertwined difficultforupdatesandmaintenanceandcodereuse NIIT高级讲师刘晓涛版权所有 TwoTiers FatclientstalkingtobackenddatabaseSQLqueriessent rawdatareturnedPresentation BusinesslogicandDataModelprocessinglogicinclientapplication NIIT高级讲师刘晓涛版权所有 Two Tier ProsandCons Pro DBproductindependence comparedtosingle tiermodel Cons Presentation datamodel businesslogicareintertwined atclientside difficultforupdatesandmaintenanceDataModelis tightlycoupled toeveryclient IfDBSchemachanges allclientsbreakUpdateshavetobedeployedtoallclientsmakingSystemmaintenancenightmareDBconnectionforeveryclient thusdifficulttoscaleRawdatatransferredtoclientforprocessingcauseshighnetworktraffic NIIT高级讲师刘晓涛版权所有 Three Tier RPCbased Thinnerclient business datamodelseparatedfrompresentationBusinesslogicanddataaccesslogicresideinmiddletierserverwhileclienthandlespresentationMiddletierserverisnowrequiredtohandlesystemservicesConcurrencycontrol threading transaction security persistence multiplexing performance etc NIIT高级讲师刘晓涛版权所有 Three tier RPCbased Pros Cons Pro BusinesslogiccanchangemoreflexiblyMostbusinesslogicresideinthemiddle tierserverCons Complexityisintroducedinthemiddle tierserverClientandmiddle tierserverismoretightly coupled thanthethree tierobjectbasedmodel Codeisnotreallyreusable comparedtoobjectmodelbased NIIT高级讲师刘晓涛版权所有 Three Tier RemoteObjectbased BusinesslogicanddatamodelcapturedinobjectsBusinesslogicanddatamodelarenowdescribedin abstraction interfacelanguage Objectmodelsused CORBA RMI DCOMInterfacelanguageinCORBAisIDLInterfacelanguageinRMIisJavainterface NIIT高级讲师刘晓涛版权所有 Three tier RemoteObjectbased Pros Cons Pro MorelooselycoupledthanRPCmodelCodecouldbemorereusableCons Complexityinthemiddle tierstillneedtobeaddressed NIIT高级讲师刘晓涛版权所有 Three tier WebServerbased Pros Cons Pro Ubiquitousclienttypes 各种各样的客户类型 ZeroclientmanagementSupportvariousclientdevicesJ2ME enabledcell phonesCons Complexityinthemiddle tierstillneedtobeaddressed NIIT高级讲师刘晓涛版权所有 Trends Movingfromsingle tierortwo tiertomultitierarchitectureMovingfrommonolithic 单片集成电路 modeltoobjectbasedapplicationmodelMovingfromapplication basedclienttoHTML basedclient NIIT高级讲师刘晓涛版权所有 Trends NIIT高级讲师刘晓涛版权所有 MultitieredApplications NIIT高级讲师刘晓涛版权所有 DistributedMultitieredApplications Client tiercomponentsrunontheclientmachine Web tiercomponentsrunontheJ2EEserver Business tiercomponentsrunontheJ2EEserver Enterpriseinformationsystem EIS tiersoftwarerunsontheEISserver NIIT高级讲师刘晓涛版权所有 J2EEComponents Applicationclientsandappletsarecomponentsthatrunontheclient JavaServletandJavaServerPages JSP technologycomponentsareWebcomponentsthatrunontheserver EnterpriseJavaBeans EJB components enterprisebeans arebusinesscomponentsthatrunontheserver NIIT高级讲师刘晓涛版权所有 J2EEClients WebClientsAppletsApplicationClientsTheJavaBeansComponentArchitecture NIIT高级讲师刘晓涛版权所有 ServerCommunications NIIT高级讲师刘晓涛版权所有 WebComponents NIIT高级讲师刘晓涛版权所有 BusinessandEISTiers NIIT高级讲师刘晓涛版权所有 J2EEContainers Normally thin clientmultitieredapplicationsarehardtowritebecausetheyinvolvemanylinesofintricatecodetohandletransactionandstatemanagement multithreading resourcepooling andothercomplexlow leveldetails Thecomponent basedandplatform independentJ2EEarchitecturemakesJ2EEapplicationseasytowritebecausebusinesslogicisorganizedintoreusablecomponents Inaddition theJ2EEserverprovidesunderlyingservicesintheformofacontainerforeverycomponenttype Becauseyoudonothavetodeveloptheseservicesyourself youarefreetoconcentrateonsolvingthebusinessproblemathand NIIT高级讲师刘晓涛版权所有 ContainerServices TheJ2EEsecuritymodelletsyouconfigureaWebcomponentorenterprisebeansothatsystemresourcesareaccessedonlybyauthorizedusers TheJ2EEtransactionmodelletsyouspecifyrelationshipsamongmethodsthatmakeupasingletransactionsothatallmethodsinonetransactionaretreatedasasingleunit JNDIlookupservicesprovideaunifiedinterfacetomultiplenaminganddirectoryservicesintheenterprisesothatapplicationcomponentscanaccessnaminganddirectoryservices TheJ2EEremoteconnectivitymodelmanageslow levelcommunicationsbetweenclientsandenterprisebeans Afteranenterprisebeaniscreated aclientinvokesmethodsonitasifitwereinthesamevirtualmachine NIIT高级讲师刘晓涛版权所有 ContainerTypes NIIT高级讲师刘晓涛版权所有 ContainerTypes J2EEserverTheruntimeportionofaJ2EEproduct AJ2EEserverprovidesEJBandWebcontainers EnterpriseJavaBeans EJB containerManagestheexecutionofenterprisebeansforJ2EEapplications EnterprisebeansandtheircontainerrunontheJ2EEserver WebcontainerManagestheexecutionofJSPpageandservletcomponentsforJ2EEapplications WebcomponentsandtheircontainerrunontheJ2EEserver ApplicationclientcontainerManagestheexecutionofapplicationclientcomponents Applicationclientsandtheircontainerrunontheclient AppletcontainerManagestheexecutionofapplets ConsistsofaWebbrowserandJavaPlug inrunningontheclienttogether NIIT高级讲师刘晓涛版权所有 Packaging NIIT高级讲师刘晓涛版权所有 J2EEmodule EJBmodules whichcontainclassfilesforenterprisebeansandanEJBdeploymentdescriptor EJBmodulesarepackagedasJARfileswitha jarextension Webmodules whichcontainservletclassfiles JSPfiles supportingclassfiles GIFandHTMLfiles andaWebdeploymentdescriptor WebmodulesarepackagedasJARfileswitha war Webarchive extension Applicationclientmodules whichcontainclassfilesandanapplicationclientdeploymentdescriptor ApplicationclientmodulesarepackagedasJARfileswitha jarextension Resourceadaptermodules whichcontainallJavainterfaces classes nativelibraries andotherdocumentation alongwiththeresourceadapterdeploymentdescriptor Together theseimplementtheConnectorarchitecture seeJ2EEConnectorArchitecture foraparticularEIS ResourceadaptermodulesarepackagedasJARfileswithan rar resourceadapterarchive extension NIIT高级讲师刘晓涛版权所有 DevelopmentRoles J2EEProductProviderToolProviderApplicationComponentProviderEnterpriseBeanDeveloperWebComponentDeveloperApplicationClientDeveloperApplicationAssemblerApplicationDeployerandAdministrator NIIT高级讲师刘晓涛版权所有 J2EE1 3APIsandTechnologies NIIT高级讲师刘晓涛版权所有 J2EE1 4Contents NIIT高级讲师刘晓涛版权所有 J2EE1 4APIs NIIT高级讲师刘晓涛版权所有 WebServicesSupport XML JAXP JAXR JAX RPC JAXM JAXBSOAP XML HTTP 简单对象访问协议WSDL Web服务描述语言UDDI 统一的描述 发现和整合ebXML 用于商务数据交换 商业流程XMLDigitalSignatureandEncryption XML的数字签名与加密 NIIT高级讲师刘晓涛版权所有 Web服务真正的优点在于 应用程序之间的松耦合相互独立的应用程序的更新B2B 更加廉价 利用InternetEAI 无缝的集成 组件之间的战争 不会影响互操作性 编程语言之间的战争 不会影响互操作性 NIIT高级讲师刘晓涛版权所有 Java技术与Web服务模型 NIIT高级讲师刘晓涛版权所有 TheJ2EEPlatformArchitecture NIIT高级讲师刘晓涛版权所有 J2EEisEnd to EndSolution NIIT高级讲师刘晓涛版权所有 N tierJ2EEArchitecture NIIT高级讲师刘晓涛版权所有 J2EEContainers Components NIIT高级讲师刘晓涛版权所有 J2EEContainers Components NIIT高级讲师刘晓涛版权所有 J2EEContainers Components ContainersdotheirworkinvisiblyNocomplicatedAPIsTheycontrolbyinterpositionContainersimplementJ2EELookthesametocomponentsVendorsmakingthecontainershavegreatfreedomtoinnovate NIIT高级讲师刘晓涛版权所有 J2EEApplicationDevelopmentLifecycle WriteandcompilecomponentcodeServlet JSP EJBWritedeploymentdescriptorsforcomponentsAssemblecomponentsintoready todeployablepackageDeploythepackageonaserver NIIT高级讲师刘晓涛版权所有 LifecycleIllustration NIIT高级讲师刘晓涛版权所有 J2EEBlueprint Bestpracticeguidelines designpatternsanddesignprinciplesMVCpatt