期末软工便于服务器群在一个内联网中分布配置

WhatisJ2EEJ2EE->Java2EnterpriseEdition.ItisSUN’sstandardforJ2EEAppserver,andforJ2EEWhyweuseAPPJ2EEAppserverisJ2EEcompatiblemiddleware.Itispurejava-based,soitcanrunontopofUnixOS,anditismorestableandsecure.Justlikeweblogic.Benefitofusingj2eeappserver/Reusealloftheappserver’s Distributed(Clustered)->Appservers Multi-tiered->differentcontainerinoneAppserver分为表示层和业务逻辑层,分Component&Container WhytheSun’sjava emore WhatispresentationPresentationlogicistheserver-sidecodeinaWebLogicServerapplicationthatdeterminesthe-sideresponsetoaspecificrequest.WhytouseJavabeanandTaglibintheJDBCEJBjavawebjavajspserveltJSPBusinesslogiclayer-EJBlayeranditsWhatisbusinessBusinesslogicisarulethatthebusinessfollowsinaparticularDifferencebetweenSessionbeanandEntityDifferenceamongSessionbean,EntitybeanandMDB(Message-driven它们都是EJB,SessionBean->businessprocess.EntityBean->businessMDB->asynchronouscommunicationbetweenandbeanBeanBean处理服Differentiatebetweenstatefulsessionbeanandstaesssessionbean?Differentiatefromthecode?Bean无状态的会话Bean通过RMI得到请求并且不会内部保留任何和它们正在服务DifferentiatebetweenCMP(Container-Managedpersistent)andBMP(Bean-ManagedPersistent)entitybean?Differentiatefromthecode?CMPEntityBean-ContaineroffersdefinedDB’sOperation(容器提供定义数据库CMPBMPBMPEntityBean-UserdefinedDB’sOperation用户定义数据库的读写等操作BMPcode不一致。CMPcodeWhyisitnecessarytouseJNDIintheJ2EEJNDI(JavaNamingandDirectory 是和检索的java标准。它可以java组件以一种相似的方式各种资源JNDIjavax.namingjavax.naming.Context接口JNDI系统进行交互。WhytousetheJDBCconnection为每一个单独的客户创建接很麻用连接池，可以限制你的数据库管理系统的连接数，提高其性能WhendoyouthinkitisnecessarytouseJTA原子性，一致性，性和持久性。(ACID)CompareRMI(Remotemethodinvocation)andEJBRMIRMIjava.io.Serializablejava.rmi.RemoteWhytouseJMS?WhatisJMS’srelationshipwithMDBandweblayercomponentlikeJMSMDB。CompareIMAPandPOP3在服务器上为用户邮件。用户的邮件客户端连接到邮件服务器上并且表用户信息。IMAP使用户可以直接从服务器问邮件，用户的邮件在服务器上，并且IMAP邮件客户端的形式呈现。不在本地WhatisTheJavaAuthenticationandAuthorizationAOP的安全框架Differencebetweenprogrtican