【什么是Java EE】
suite of specifications for APIs, a distributed computing architecture, and definitions for packaging of distributable components for deployment.
a collection of standardized components, containers, and services for creating and deploying distributed applications within a well-defined distributed computing architecture
API规范套件，分布式计算架构以及用于部署可分发组件的包装定义。
用于在明确分布式计算架构内创建和部署分布式应用程序的标准化组件，容器和服务的集合
Sun says “Java Platform, Enterprise Edition 5 (Java EE 5) defines the standard for developing component-based multitier enterprise applications “
Java EE object software needs to be partitioned into functional pieces and deployed on the appropriate hardware platforms
Sun表示：“Java平台企业版5（Java EE 5）定义了开发基于组件的多层企业应用程序的标准”
Java EE对象软件需要分为功能块，并部署在适当的硬件平台上
【J2EE的三层结构】
