使用文件I/O操作，将键盘输入的学生及成绩信息保存在一个文件中；

定于学生类，包括学生自然信息、成绩信息；

键盘输入学生的信息（自然信息、成绩信息）；

从文件中读取学生的信息，统计每个学生的总成绩和名次，输出到控制台和日志文件中；

自定义异常类，验证输入成绩的正确性-Use file I/O operation, the keyboard input of students and performance information stored in a file　scheduled for student categories, including the students of natural information, performance information　keyboard input their information (natural information, performance information)　from the file read their information, statistics and a total score of each student ranking, the output to the console and log files　custom exception class, verify the correctness of input results