文件上传 allowedTypes设置

<interceptor-stack name="fileUploadStack">
????<interceptor-ref name="fileUpload">
?????<param name="maximumSize">4096000</param>
?????<param name="allowedTypes">
??????image/bmp,image/jpg,image/x-png,image/gif,image/jpeg,text/plain,application/msword,application/excel,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/zip,application/x-zip-compressed,application/rar,application/octet-stream,application/xml,text/xml
?????</param>
????</interceptor-ref>
????<interceptor-ref name="basicStack" />
???</interceptor-stack>

不限制的话就不要allowedTypes这个参数设置