基础架构层——物理硬件、网络和操作系统。
Infrastructure Layer - physical hardware, network and operating systems.
其次从系统建设所用到的技术入手，对三层架构、J2EE框架、GPRS通讯、GPS定位、企业门户网站、网络与安全等方面进行了详细探讨。
Second, from the use of the technology , it discusses detailedly the three-tier structure, J2EE framework, GPRS communications, GPS positioning, enterprise portal, network , security , and so on.
一般的网络版软件采用二层结构，本文采用了客户端、中间件、服务端的三层结构来架构系统。
The general network-version software adopt two layers of structure, the thesis have adopt three layers of structure to realize the system frame.
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