struts2文件类型(二)
/tiff',
'.tr' : 'application/x-troff',
'.tsv' : 'text/tab-separated-values',
'.txt' : 'text/plain',
'.ustar' : 'application/x-ustar',
'.vcf' : 'text/x-vcard',
'.wav' : 'audio/x-wav',
'.wiz' : 'application/msword',
'.wsdl' : 'application/xml',
'.xbm' : 'image/x-xbitmap',
'.xlb' : 'application/vnd.ms-excel',
'.xls' : 'application/excel',
'.xls' : 'application/vnd.ms-excel',
'.xml' : 'text/xml',
'.xpdl' : 'application/xml',
'.xpm' : 'image/x-xpixmap',
'.xsl' : 'application/xml',
'.xwd' : 'image/x-xwindowdump',
'.zip' : 'application/zip',