一个基本的学生成绩管理系统，有选课，查课，查看成绩，以及导入导出成绩的基本功能，方便了解Java web项目的实现流程。(A basic student performance management system, there are courses, check classes, view the results, as well as import and export results of the basic functions, to facilitate understanding of the Java web project implementation process.)