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 four typical J2EE model, and its frame structure, and finally the 13 kinds of J2EE core technology of a profile. In this paper, the categories of services on J2EE, components, levels, and containers, API has done a more detailed introduction, I believe after reading this article, readers will have a clearer J2EE knowledge.