用java实现的linux的二级文件系统，可以实现如下功能：login，dir，create，delete，open，close，read，write2.列目录时要列出文件名，物理地址，保护码和文件名3.源文件可以进行读写保护-Linux using java to achieve the secondary file system, you can achieve the following features: login, dir, create, delete, open, close,

防止注入文件，保护网页被非法写入非法字符，引导客户到带病毒网站-Into the document to prevent, protect page is illegal to write illegal characters, leading them to the site with a virus