本文从五个方面对J2EE进行了比较全面的介绍。从J2EE的概念说起，到它的优势，到J2EE典型的四层模型，和它的框架结构，最后是J2EE十三种核心技术的一个简介。本文分门别类的对J2EE中的服务，组件，层次，容器，API都做了比较详细的介绍，相信看完此文，读者会对J2EE有一个更清晰的认识。-In this paper, five aspects of J2EE have been a more comprehensive introduction. Speaking from the concept of J2EE, to its advantage, to the typical four-J2EE model, and its frame structure, and finally the 13 kinds of J2EE core technology of a profile. This article on J2EE categories of services, components, levels, and containers, API has done a more detailed introduction, I believe after reading this article, readers will have a J2EE a clearer understanding.