Oracle 9i應(yīng)用服務(wù)器及J2EE架構(gòu)課件

Oracle9i應(yīng)用服務(wù)器及J2EE架構(gòu)計算中心數(shù)據(jù)庫課題組2002.2.25內(nèi)容Oracle9i應(yīng)用服務(wù)器Oracle9iASContainersforJ2EEArchitectureOracle9i應(yīng)用服務(wù)器Oracle9iAS同Oracle9i

和

Oracle9i

Developer

Suite工具集結(jié)合在一起，為創(chuàng)建、提交和管理Internet應(yīng)用提供了高度可伸縮的、基于標準的基礎(chǔ)結(jié)構(gòu)和優(yōu)良的數(shù)據(jù)集成特性。適于運行任何Internet應(yīng)用包括J2EE和基于模型的應(yīng)用。Oracle9iAS提供了由

Apache所支持的Oracle9iAS

高速緩存等新特性，可大幅提高網(wǎng)站性能和規(guī)模可調(diào)性。無需增加更多的昂貴硬件就可以以更豐富的動態(tài)頁面內(nèi)容支持更多的用戶。Oracle9iAS

以Web界面為先，將瀏覽器作為標準訪問界面，同時還有很多可用的現(xiàn)成Portlet(網(wǎng)頁模塊)存儲在Oracle

9i

數(shù)據(jù)庫中，這樣用戶只需要通過裝配組合就可以快速構(gòu)造出企業(yè)電子商務(wù)門戶。Oracle9iAS

還支持基于角色的個性化處理，能夠構(gòu)建一次登錄門戶。Oracle9iAS

Wireless支持任何訪問設(shè)備，并能夠根據(jù)訪問設(shè)備的不同進行個性化處理。

Oracle9iApplicationServerSolutions

Oracle9iApplicationServerComponents(1）

Solution

Oracle9iASComponentsJ2EEandInternetApplications

OracleHTTPServer,OracleiASContainersforJ2EE,OracleiASWebServices,OraclePL/SQL,Oracle9iASFormsServices,OracleXMLDeveloperKit,Oracle9iClienPortalsOracle9iASPortal,Oracle9iASPortalDeveloperKitWirelessOracle9iASWirelessCachingOracle9iASWebCacheOracle9iApplicationServerComponents(2)Solution

Oracle9iASComponentsBusinessIntelligenceOracle9iASReportsServices,Oracle9iASDiscoverer,Oracle9iASPersonalization,Oracle9iASClickstreamIntelligenceE-BusinessIntegrationOracle9iASInterConnect，Oracle9iASUnifiedessaging，OracleInternetManagementandSecurityOracleEnterpriseManager，Oracle9iASSingleSign-On，OracleInternetDirectory，Oracle9iASInfrastructureSupportedTechnologiesandProgrammingLanguages

JavaandJ2EEXMLPL/SQL

JSP：JavaServerPages

Servlets

EJB：EnterpriseJavaBeans

JDBC：JavaDatabaseConnectivityJTA：JavaTransactionAPIJNDI：JavaNamingandDirectoryInterfaceJMS：JavaMessageServiceJAAS：JavaAuthenticationandAuthorizationServiceWebServices

DOM：DocumentObjectModelXSLT：ExtensibleStylesheetLanguageTransformationsXMLSchemasSAX：SimpleAPIforXMLXSQLIDAP：InternetDataAccessPresentation

XPath：XMLPathLanguageSOAP：SimpleObjectAccessProtocolWSDL：WebServicesDescriptionLanguageUDDI：UniversalDescription,Discovery,andIntegrationPL/SQLServerPagesPL/SQLWebToolkitOracleForms

Oracle9iASContainersforJ2EEArchitectureOracle9iAS容器OC4JOC4J：Oracle9iASContainerforJ2EEOC4J是一個快速的、輕量級的、可伸縮的符合J2EE標準的J2EE容器，運行在標準的Java虛擬機上，包括兩個容器：OC4JWebContsiner

ServletContainerJSPTranslatorOC4JEJBContainerJSPTranslator工作原理JSPTranslator包括翻譯器和編譯器。翻譯器把JSP翻譯成Java源代碼文件，編譯器把源文件編譯成Java字節(jié)代碼（.class）文件,使用Java的運行時庫在ServletContainer中執(zhí)行一個Servlet。運行時庫包括解釋JSP文件中的標簽（Tag）和宏的支持文件，ServletContainer還提供對JavaAPI和其他服務(wù)的訪問。當用戶從JSP文件（例如.jsp）請求一個URL時,其工作步驟如下：WebServer請求JSPTranslator，它翻譯Hello.jsp

為Hello.java文件。請求Java編譯器建立Hello.class。請求Java運行時庫，運行Hello.class如果Hello.class有數(shù)據(jù)庫的請求信息，則ServletContainer提供JDBC訪問，是它檢索到信息并將結(jié)果返回到客戶端瀏覽器。OC4JEJBContainer工作原理EJBContainer如何工作依賴于使用那種類型的bean，Container管理一個J2EE應(yīng)用的bean的執(zhí)行。對于會話beans（sessionbeans）EJBContainer提供與WebContainer相同的所有的服務(wù)，例如對API和虛擬機的訪問、事務(wù)服務(wù)、安全和對EJB方法授權(quán)等。對于實體beans（entitybeans），它是以永久存儲機制來表示商務(wù)對象，用戶可以選擇bean管理它自己的永久存儲，即bean-managedpersistence(BMP)beans；也可以使用Container管理永久存儲，即container-managedpersistence(CMP)beans.。Oracle9iASContainersforJ2EESupportedAPIs

APIVersionJavaServerPages(JSP)1.2JavaServlet2.3EnterpriseJavaBeans(EJB)2.0JavaDatabaseConnectivity(JDBC)2.0JavaTransactionAPI(JTA)1.0JavaMessageService(JMS)1.0JavaMail1.2JavaBeansActivationFramework1.0JavaAPIforXML(JAXP1.1J2EEConnectorAPI1.0JavaAuthenticationandAuthorizationService(JAAS)1.0JSPtranslator,JSPengine是翻譯、執(zhí)行和處理JSP頁面的實體，并傳遞請求。根據(jù)實現(xiàn)到實現(xiàn)，JSPtranslator的體系結(jié)構(gòu)是有變化的，但無論如何變化它是一個或多個Servlet組成。JSPtranslator是通過servletcontainer執(zhí)行的。WhatisaServlet?Servlet是基于Web組件的Java技術(shù)，由ServletContainer管理，產(chǎn)生動態(tài)網(wǎng)頁內(nèi)容。Servlet是小Java程序，運行在WebSercer端，與運行在客戶瀏覽器端的Applet不同。servlets與系統(tǒng)平臺無關(guān)。Servlets與webclients交互是通過request/response規(guī)范由

servletcontainer實現(xiàn)的。WhatisaServletContainer?Containers,sometimescalledservletengines,arewebserverextensionsthatprovideservletfunctionality.Theservletcontainerisapartofawebserverorapplicationserver.Itprovidesthenetworkservicesoverwhichrequestsandresponsesaresent,decodesMIMEbasedrequests,andformatsMIMEbasedresponses.Aservletcontaineralsocontainsandmanagesservletsthroughtheirlifecycle.WhatisEJBcontainer?EJBcontainerThecomponentcoordinatorinanEJBapplication.TheoneofkeyEJBruntimecomponents.

EJBapplicationAframeworkofdeployingCORBAobjectswritteninJava,whichadheretotheEJBspecification.EJBdeploymentdescriptorDD:DeploymentDescriptorsAJ2EEapplicationandeachofitsmoduleshasitsowndeploymentdescriptor(DD).ADDisanXMLtext-basedan.xmlextensionItdescribesthedeploymentsettingsforacomponent.Forexample,anenterprisebeanmoduleDDdeclarestransactionattributesandsecurityauthorizationsforanenterprisebean.DDinformationisdeclarativesoitcanbechangedwithoutmodifyingthebeansourcecode.Atruntime,theJ2EEserverreadstheDDandactsonthecomponentaccordinglyEJBDDAserializedobjectthatprovidesinformation,suchastransactionandsecuritypolicies,abouthowanEJBapplicationorobjectshouldbedeployed.WhatIsaJ2EEApplication?J2EE應(yīng)用程序是由多個J2EE組件組成的，一個J2EE組件是一個自含功能軟件單元，J2EE應(yīng)用程序用這些單元與它相關(guān)的類和用于與其它組件通信的XML描述符文件裝配而成。J2EE組件是用JAVA程序語言寫的，與用JAVA語言編寫的其它程序有相同的編譯方法。J2EE的客戶端類型J2EEapplications支持如下兩種客戶端方式：ApplicationClients:Applicationsrunningonaclientmachinethatdirectlyaccessenterprisebeansthatarerunninginthebusinesslogictier.ApplicationclientscanalsoopenanHTTPconnectiontoestablishcommunicationwithaservletrunningontheInternettierifaJ2EEapplicationrequiresit.DynamicHTMLandXMLPages:InthecontextofJ2EEapplications,dynamicHTMLandXMLpagesaregeneratedbyservletsorpagescreatedwithJavaServerPagestechnologyrunningintheWebtier.ThesepagescanbeextensionstotraditionalstaticHTMLpagesallowingapplicationdeveloperstooffercustomizedandpersonalizedpagestothe

J2EEApplication組件類型在J2EEapplications使用的組件：Servlets:AservletisaJavaclassusedtoextendthecapabilitiesofserversthathostapplicationsaccessedthrougharequest-responseprogrammingmodel.JavaServerPages:JavaServerpages(JSPs)aretextfilesthatcontaintwotypesofinformation:statictemplatedata,whichcanbeexpressedinanytext-basedformat,suchasHTML,WML(WirelessMarkupLanguage),orXML,andJSPelements,whichconstructdynamiccontent.EnterpriseBeans:Enterprisebeansareserver-sidecomponentsthatencapsulatethebusinesslogicofanapplication.iAS安裝類型(2)Table:Oracle9iASInstallTypesiASAdministrationTools

OracleEnterpriseManagerWebSite

OracleEnterpriseManagerConsole

UsingtheConsolewiththeOracleEnterpriseManagerWebSiteOracleEnterpriseManagerWebsiteTheOracleEnterpriseManagerWebsiteprovidesWeb-basedmanagementtoolsdesignedspecificallyforOracle9iAS.UsingtheWebsite,youcanmonitorandconfigurethecomponentsofyourOracle9iApplicationServerinstallations.Youcandeployapplications,managesecurity,andcreateandmanageOracle9iApplicationServerclusters.

TheOracleE