在web网站编辑中，往往要用到网站文件的上传与下载功能，这时可以用Java提供的I/O流的类实现，也可以使用JSP的组件jspSmartUpload（本程序）来实现-I/class web site editor, often use the site to upload and download files, then you can use Java implementations provide O stream, you can use JSP components jspSmartUp