display excel from TOMCAT site

when display a excel file from a tomcat server, the web page show the text format of the excel file. In order to display it correctly, add following code in the web.xml in conf directory.

mime-mapping
extension xls extension
mime-type application/vnd.ms-excel MIME-TYPE
/MIME-MAPPING

also, you need add your site as intranet in web explorer, which meaning the security for your site is very low.