添加测试用例
修改结构
修改文档
Merge branch 'master' of https://github.com/dilidili/NJU_EMS.git

Conflicts:
	nju_ems_artifact/src/main/java/nju_ems_group/nju_ems_artifact/login/loginbl/Login.java
	nju_ems_artifact/target/classes/nju_ems_group/nju_ems_artifact/login/loginbl/Login.class