jxl.jar主要运用于java程序于excel的交流时使用 可以用代码进行读取存取。-jxl.jar used primarily for the exchange of java program in excel with the code can be used to read access

java操作File的例子包括：操作Excel，文件读写、随机访问文件、分割大文件为多个小文件-Examples of java File operations: Operation Excel, the file read and write, random access files, split large files into smaller files