教学代码，适合初学JSP/Servlet的同学。 案例是ERP系统，独家制作，仅在该平台发布。 程序配置好环境可直接运行，请根据pom.xml下载相应的jar包。(Teaching code, suitable for students to learn JSP/Servlet. The case is ERP system, exclusive production, only on this platform. The program is configured well, and