在Java Web Application中显示xls / xlsx的API或库支持？

I would like to display xls/xlsx document in my web application. It is used JSF2.0. The user can upload Meeting Agenda with xls/xlsx document when he or she reserve the meeting room. I would like to provide a feature that to display the document when attendees join the meeting room. I don't know which API to support for java web. Can Apache POI use to display in web page?I would like to display xls/xlsx document in my