本文档描述了如何利用Ext进行文件上传的处理，其中包含了Ext组件上传文件所使用到的具体框架，本例是以上传Excel为例，具体说明了如何上传Excel文件，并在后台使用Struts2来进行接收处理-This document describes how to use Ext for file upload handling, which includes the Ext component to upload files using a specific framework, in this case is uploaded Excel, for example, to specify how to upload Excel files, and the background for receiving and processing using Struts2