针对文本文件进行操作. 将文本文件每20行存储为一个新文件. 可设定存储路径, 可一次处理多个文件. 在界面线程内完成处理操作.-For a text file operations performed. Every 20 lines text file stored as a new file. Storage path can be set, you can handle multiple files at once. Complete processing operation within