自己在项目中经常用到的java版文件操作源码，包含读、写、删除，带缓存的操作，以及追加内容到文件末尾等操作，有详细的注释。-Oneself is often used in the project of Java version of the file, the source code, include to read, write, delete, with the operation of the cache, and additional content to the end of the file operations.