以前一直用smartupload，后来才发现他只有上传一些小的文件，一但大的文件就反应很慢，上传速度也很慢，后来又在网上找了，commons-fileupload这个上传文件，这里是官方网站的说明，如下：
Using FileUpload
使用FileUpload
FileUpload can be used in a number of different ways, depending upon the requirements of your application. In the simplest case, you will call a single method to parse the servlet request, and then pr...