Introduction - If you have any usage issues, please Google them yourself
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.