DiskFileItemFactory类是文件上传才需要用到的类，所以，我们需要添加commons-fileupload依赖
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.1</version>
</dependency>
这个依赖是文件上传所必须的依赖。
- ClassNotFoundException DiskFileItemFactory fileupload commons apacheclassnotfoundexception diskfileitemfactory fileupload common-fileupload common-fileupload fileupload组件 文件 classnotfoundexception resources apache ibatis apache-commons commons apache io digestutils commons apache digest commons apache pool2 idea ioutils commons apache org 常用工具apache-commons常用commons