J2EE(Java 2 Platform，Enterprise Edition）是SUN公司定义的一个开发分布式企业级应用的规范。它提供了一个多层次的分布式应用模型和一系列开发技术规范。多层次分布式应用模型是指根据功能把应用逻辑分成多个层次，每个层次支持相应的服务器和组件，组件在分布式服务器的组件容器中运行（如Servlet组件在Servlet容器上运行，EJB组件在EJB容器上运行），容器间通过相关的协议进行通讯，实现组件间的相互调用。遵从这个规范的开发者将得到行业的广泛支持，使企业级应用的开发变得简单、快速。-J2EE (Java 2 Platform, Enterprise Edition), Sun is the definition of a development of distributed enterprise applications and standards. It provides a multi-layered model of distributed application development, and a series of technical standards. Distributed multi-level application model is defined features to the application logic into several layers, each corresponding to support the servers and components, server components of the Distributed Component packaging operation (such as components in Servlet Servlet containers running on the EJB EJB containers run), containers between Qualcomm all relevant agreements communications components to achieve the mutual call. To comply with the norms of the development will be a broad industry support to enable enterprise-class application develop