java 里面很重要的一个jar包，servlet的源代码，值得一读，自己把后缀名去除掉哦-which is very important in a jar in java servlet source code, it is worth a read

jsp文件实现学生信息的增删改查，数据库文件直接建一个学生信息表，变量都在程序源码中-jsp file additions and deletions of student information to change the check, the database file directly to build a student information sheet, the variables in the program source