一个关于下载文件的工具类，内含基于Struts，spring，mybatis中应用下载工具类的说明-A utility class on the downloaded file, containing Struts, spring, mybatis application download instructions based tools

该程序使用java语言进行编程，该功能是使用java文件流技术实现文件下载功能-Use java file streaming technology to download the file