请假系统，可运行。包含全部源码和配置文件及数据库建表脚本。lib包太大，没有上传，只需要增加相关 的lib包即可编译通过。-Leave system, can run. Contains all the source code and configuration files and build table scr ipt. Lib package is too large, there is no upload, only need to increase the relevant lib p