JavaBean 容器 EJB 容器（EJB Container）用于管理企业级 JavaBean 对象的生命周期和方法调用。Java EE 规范定义了 3 种运行在 EJB 容器内的组件：会话 EJB、消息驱动 EJB 和实体 EJB，分别完成不同领域的业务处理。 EJB 容器运行在符合 Java EE 的应用服务器内，驻留在服务器端。 其他组件通过 RMI/IIOP 协议与 EJB 容器通信，通过 容器通信，通过 EJB 容器来访问 EJB 组件的业务方法。 EJB 主要应用于重量级企业应用系统开发，在以 Web 服务为主的企业业务系统中，可以选择轻量级组件替代 EJB。 ## 接下来… 软件开发现状 Java EE 概述 Java EE 容器 Java EE 组件 组件间通信协议 ## Java EE 组件 ( Component ) Java EE 规范约定组成企业级软件系统的组成单元是组件。 1. Application Client Component 2. Applet Component 3. Web Component * ▶ Servlet JSP ### 4. EJB Component * ▶ Session Bean Entity Bean ▶ Message Driven Bean ## Web 组件 * Web 组件在近十几年的互联网应用中得到广泛应用，一度成为

..... 354 17.8. Considerations when choosing a technology ..... 354 18. Enterprise Java Bean (EJB) integration ..... 356 18.1. Introduction ..... 356 18.2. Accessing EJBs ..... 356 18.2.1. Concepts SLSBs ..... 356 18.2.3. Accessing remote SLSBs ..... 358 18.3. Using Spring's convenience EJB implementation classes ..... 358 19. JMS ..... 361 19.1. Introduction ..... 361 19.2. Using Spring that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ The Spring Framework also provides an access- and abstraction-

JavaBeans (EJB) Integration ..... 26 3.1. Accessing EJBs ..... 26 3.1.1. Concepts ..... 26 3.1.2. Accessing Local SLSBs ..... 27 3.1.3. Accessing Remote SLSBs ..... 28 3.1.4. Accessing EJB 2.x SLSBs SLSBs Versus EJB 3 SLSBs ..... 29 4. JMS (Java Message Service) ..... 30 4.1. Using Spring JMS ..... 31 4.1.1. Using JmsTemplate ..... 31 4.1.2. Connections ..... 32 Caching Messaging Resources formatting, such as XStream to let servers be implemented in other technologies. Last but not least, EJB has an advantage over RMI, in that it supports standard role-based authentication and authorization

59 5.6. Convenient proxy creation ..... 59 5.6.1. TransactionProxyFactoryBean ..... 60 5.6.2. EJB proxies ..... 61 5.7. Concise proxy definitions ..... 61 5.8. Creating AOP proxies programmatically local SLSBs ..... 168 15.1.3. Accessing remote SLSBs ..... 170 15.2. Using Spring convenience EJB implementation classes ..... 170 16. Remoting and web services using Spring ..... 173 16.1. Introduction that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction

58 5.6. Convenient proxy creation ..... 58 5.6.1. TransactionProxyFactoryBean ..... 59 5.6.2. EJB proxies ..... 60 5.7. Concise proxy definitions ..... 60 5.8. Creating AOP proxies programmatically local SLSBs ..... 164 15.1.3. Accessing remote SLSBs ..... 166 15.2. Using Spring convenience EJB implementation classes ..... 166 16. Remoting and web services using Spring ..... 169 16.1. Introduction that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction

54 5.6. Convenient proxy creation ..... 54 5.6.1. TransactionProxyFactoryBean ..... 55 5.6.2. EJB proxies ..... 56 5.7. Concise proxy definitions ..... 56 5.8. Creating AOP proxies programmatically local SLSBs ..... 159 15.1.3. Accessing remote SLSBs ..... 161 15.2. Using Spring convenience EJB implementation classes ..... 161 16. Remoting and web services using Spring ..... 164 16.1. Introduction that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction

59 5.6. Convenient proxy creation ..... 59 5.6.1. TransactionProxyFactoryBean ..... 60 5.6.2. EJB proxies ..... 61 5.7. Concise proxy definitions ..... 61 5.8. Creating AOP proxies programmatically local SLSBs ..... 177 16.1.3. Accessing remote SLSBs ..... 179 16.2. Using Spring convenience EJB implementation classes ..... 179 17. Remoting and web services using Spring ..... 182 17.1. Introduction that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction

62 5.6. Convenient proxy creation ..... 62 5.6.1. TransactionProxyFactoryBean ..... 62 5.6.2. EJB proxies ..... 63 5.7. Concise proxy definitions ..... 64 5.8. Creating AOP proxies programmatically local SLSBs ..... 182 16.1.3. Accessing remote SLSBs ..... 184 16.2. Using Spring convenience EJB implementation classes ..... 184 17. Remoting and web services using Spring ..... 187 17.1. Introduction that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction

61 5.6. Convenient proxy creation ..... 61 5.6.1. TransactionProxyFactoryBean ..... 61 5.6.2. EJB proxies ..... 62 5.7. Concise proxy definitions ..... 63 5.8. Creating AOP proxies programmatically local SLSBs ..... 181 16.1.3. Accessing remote SLSBs ..... 183 16.2. Using Spring convenience EJB implementation classes ..... 183 17. Remoting and web services using Spring ..... 186 17.1. Introduction that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction

71 6.6. Convenient proxy creation ..... 71 6.6.1. TransactionProxyFactoryBean ..... 71 6.6.2. EJB proxies ..... 72 6.7. Concise proxy definitions ..... 73 6.8. Creating AOP proxies programmatically local SLSBs ..... 217 17.1.3. Accessing remote SLSBs ..... 219 17.2. Using Spring convenience EJB implementation classes ..... 219 18. JMS ..... 222 18.1. Introduction ..... 222 18.2. Domain that hard anymore.  EJB $ _{s} $ - Wrapping existing POJO $ _{s} $ Spring also provides an access layer and abstraction