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1、LearningJ2EEIntroductiononJavabasedEnterprisesSystems(BuildingLegacy/EnterprisesSystems).Logicallayersofsoftware1)Presentationmanager2)Presentationlogic3)Applicationlogic4)Businesslogic5)Databaselogicand6)DatabasemanagerAnautonomousprocessisolatedduetoitsimportanceandintensiveoperationknownastire.
2、1tireAll6layersinsinglesoftware2tire6Layersseparatedasclientandserver(dividedintoautonomousprocesses)Belowarethemodelsthatareavailable“Presentationmanager”or“PresentationmanagerandPresentationlogic”or“Presentationmanager,Presentationlogicandapplicationlogic”asclientandtheotherlayersactasaserver.3t
3、ireHerewehaveoneadditionalprocessidentifiedthatcanbesegregatedtoimprovethesystem.Itsknowasmiddlewareandconsistsof“presentationlogic,applicationlogicandbusinesslogic”orbusinesslogicalone.TechnologiestheconstitutesJ2EEComponent(Servlets,JSP,EJB)Service(JDBC,JMS,JTA,JavaMail,JAF,JAAS,JNDI)Integration
4、(JAXP,JCA,IDL)Communication(RMI,IIOP)15elementsconstituteJ2EE(Servlets,JSP,EJB,JDBC,JMS,JTA,JavaMail,JAF,JAAS,JNDI,JAXP,JCA,IDL,RMI,IIOP)TheJ2EEarchitecture(DifferentContainers)·AnapplicationclientcontainerforhostingstandardJavaclientapplications.·AnappletcontainerforhostingJavaapplets.·Awebcontai
5、nerforhostingServletsandJSPpages.·AnEJBcontainerforhostingEnterpriseJavaBeans.Normally4tireforJ2EEArchitecture.ClienttireWebtireBusinesslogictireEnterpriseinformationsystemtireContainerAcontainerisaruntimeenvironmentforapplicationcomponentsContainercontainsoneormoreapplicationcomponents.Thecontain
6、eritselfisdividedintofourparts:ContainercontractContainerservicesAPIDeclarativeservicesOthercontainerservicesJ2EE(EJB)ApplicationDevelopment·Enterprisebeanprovider.TherolethatdevelopsEJBcomponents.·Theapplicationassembler.TherolethatcombinesEJBcomponentswithothersofteware(e.g.webcomponents)inorder
7、tomakeacompleteapplication.·Deployer.Therolethattakestheapplicationandinstallitonanapplicationserver,resolvinganyreferencestoexistingresourcesinthetargetenvironment.·Applicationserver/EJBcontainervendor.Theroleth
