用filter实现的权限控制系统。这是一个可部署的实例。简单易懂，没有用的spring,但是也是权限控制的一种思路-Competence achieved by filter control system. This is an example of the deployment. Easy-to-read, not used in spring, but access control is also a train of thought

使用eclipse绘制的UML活动图。介绍的是火车控制系统的活动-Using eclipse draw UML activity diagram. Describes the activities of the train control system

应用java开发的列车运行控制系统，比较简单，适用于java初学者开发程序-Java application development Train Control System, is relatively simple, suitable for beginners java development process