文件操作
........\写入数据
........\........\file.txt
........\........\MyJsp.jsp
........\........\注意.txt
........\创建与删除目录
........\..............\createml.jsp
........\..............\deleteml.jsp
........\创建文件
........\........\createfile.jsp
........\........\创建文件.wps
........\........\错误.wps
........\删除文件
........\........\deletefile.jsp
........\........\删除文件位置.txt
........\添加数据
........\........\MyJsp.jsp
........\........\注意.txt
........\读取文件
........\........\duquwenjian.jsp