bug : it's will failed to login when the user name is chinese !

https://github.com/YUbuntu0109/sms/blob/97f7b13c5d38b9cbe3d925bcd9bf9ec42dc97429/student_information_management_system/src/pers/huangyuhui/sms/servlet/LoginServlet.java#L64-L66

> This project isn't maintained so please add new user info into the database when you want to login . . .