利用Apache Commons项目中的FileUpload组件，实现文件的上传和下载，及时更新数据库和网页的内容-Using Apache Commons FileUpload project components, implementation file uploads and downloads, updating databases and content of the page

文件的上传与下载，用的Apache的jar包，实现了多文件上传，单文件下载。-upload and download files by tomcat server,using java language implements.servlet based.