在线测评系统用于老师上机教学，分为教师端和学生端，学生端功能：连接服务器、在线编辑、上传文件、防作弊（编辑器生成的文件加密），教师端功能为：生成试卷、发送试卷、屏幕广播、点名查到等-On-line measurement system for teacher-on teaching, teachers are divided into client-side and students, student-side functions: connect to the server, on-line