J2EE编写企业应用教程(含源码)
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**正文** 本教程聚焦于使用J2EE技术栈来构建企业级应用程序,旨在帮助开发者深入理解和实践J2EE平台的各项核心功能。J2EE(Java 2 Platform, Enterprise Edition)是Oracle公司提供的一个开放标准,用于开发和部署分布式、多层的企业应用。它包括一系列的API、服务和容器,使得开发者可以构建可扩展、安全且高度可靠的网络应用。 在J2EE平台上,主要涉及以下几个关键知识点: 1. **Servlet与JSP**:Servlet是Java服务器端编程的基础,它提供了一个用于处理HTTP请求的接口。JSP(JavaServer Pages)则是一种动态网页技术,允许开发者将HTML代码和Java代码混合编写,实现视图与逻辑的分离。二者结合,可以实现动态网页的创建。 2. **EJB(Enterprise JavaBeans)**:EJB是J2EE的核心组件模型,用于构建业务逻辑。它分为三种类型:Session Beans(处理客户端请求)、Entity Beans(表示数据库中的持久对象)和Message Driven Beans(处理消息队列)。 3. **JNDI(Java Naming and Directory Interface)**:JNDI提供了查找和管理资源的接口,如数据库连接池、邮件服务器等。开发者可以通过JNDI查找并绑定应用所需的资源。 4. **JTA(Java Transaction API)**:用于管理事务,确保数据的一致性和完整性。JTA支持分布式事务处理,使得多个操作可以在一个事务中执行。 5. **JMS(Java Message Service)**:JMS提供了一种标准的接口,用于在Java应用之间交换消息。它支持点对点和发布/订阅两种消息模型,常用于异步通信。 6. **JPA(Java Persistence API)**:JPA是Java标准的ORM(对象关系映射)框架,简化了Java应用与数据库之间的交互。它可以自动处理SQL语句,让开发者更专注于业务逻辑。 7. **JSF(JavaServer Faces)**:JSF是一种用于构建用户界面的MVC(Model-View-Controller)框架,提供了一系列UI组件和事件处理机制,简化了Web应用的开发。 8. **CDI(Contexts and Dependency Injection)**:CDI为Java EE应用提供依赖注入和上下文管理,使得组件的依赖关系更加清晰,提高了代码的可测试性和可维护性。 9. **WS(Web Services)**:J2EE支持通过JAX-WS和JAX-RS实现Web服务的开发,前者基于SOAP协议,后者基于RESTful风格,可以实现不同系统间的互操作。 10. **应用服务器**:如Tomcat、GlassFish、WildFly等,它们提供了运行J2EE应用的环境,包含了J2EE规范定义的各种服务和容器。 本教程包含的源码部分,将会是上述技术的实际应用展示,帮助学习者通过实际操作理解各组件如何协同工作。通过实践这些示例,开发者能够更好地掌握J2EE平台的开发流程和最佳实践,提升企业应用的开发能力。
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