由于网上找不到一个合适的软件来分割一个大文件，于是自己写了一个程序。该程序能够针对任意大文件提取其中某一段数据写成新文件。该程序可作为文件读写，多线程操作的一个学习例子。-Because I can not find an appropriate software to split a large file in the Internet , so he wrote a program. The program can be written in a piece of data for any