1.使用

.xls    -------------------------------------------------------------------------------------   application/vnd.ms-excel
.xlsx  --------------------------   application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.csv   ---------------------------------------------------------------------------------------  text/csv
.doc   ---------------------------------------------------------------------------------------    application/msword
.docx  ---------------   application/vnd.openxmlformats-officedocument.wordprocessingml.document
.pdf   -----------------------------------------------------------------------------------------------    application/pdf
.ppt  -----------------------------------------------------------------------------    application/vnd.ms-powerpoint
.pptx   ----------------   application/vnd.openxmlformats-officedocument.presentationml.presentation
.png    ----------------------------------------------------------------------------------------    image/png
.gif    --------------------------------------------------------------------------------------------------    image/gif
.jpeg  ---------------------------------------------------------------------------------------------------    image/jpeg
.jpg    ----------------------------------------------------------------------------------------------------   image/jpeg
.mp3  ----------------------------------------------------------------------------------------------------   audio/mpeg
.aac  ------------------------------------------------------------------------------------------------   audio/aac
.html -----------------------------------------------------------------------------------------------   text/html
.css    ------------------------------------------------------------------------------------------    text/css
.js    --------------------------------------------------------------------------------------------------    text/javascript
.json    -----------------------------------------------------------------------------------------    application/json
.abw   -----------------------------------------------------------------------------------  application/x-abiword
.arc    -----------------------------------------------------------------------------------    application/x-freearc
.avi   -----------------------------------------------------------------------------------------  video/x-msvideo
.azw   -----------------------------------------------------------------------    application/vnd.amazon.ebook
.bin   ------------------------------------------------------------------------------------    application/octet-stream
.bmp    ---------------------------------------------------------------------------------------    image/bmp
.bz   --------------------------------------------------------------------------------------------    application/x-bzip
.bz2    ----------------------------------------------------------------------------------------    application/x-bzip2
.csh    ----------------------------------------------------------------------------------------    application/x-csh
.eot   ---------------------------------------------------------------------------   application/vnd.ms-fontobject
.epub  --------------------------------------------------------------------------   application/epub+zip
.htm    ------------------------------------------------------------------------------------   text/html
.ico ------------------------------------------------------------------------------    image/vnd.microsoft.icon
.ics   ------------------------------------------------------------------------------------------    text/calendar
.jar  --------------------------------------------------------------------   application/java-archive
.rar   ---------------------------------------------------------------------  application/x-rar-compressed
.svg   ---------------------------------------------------------------------------------   image/svg+xml
.swf    -----------------------------------------------------------------   application/x-shockwave-flash
.tar   --------------------------------------------------------------------------   application/x-tar
.tif    -----------------------------------------------------------------------------------------------   image/tiff
.ttf   ---------------------------------------------------------------------------------------------------   font/ttf
.txt    ---------------------------------------------------------------------------------------------------    text/plain
.vsd  ------------------------------------------------------------------------------------ application/vnd.visio
.wav -----------------------------------------------------------------------------------------------    audio/wav
.weba ------------------------------------------------------------------------------------------    audio/webm
.webm ------------------------------------------------------------------------------------------    video/webm
.webp  --------------------------------------------------------------------------------------------  image/webp
.woff  --------------------------------------------------------------------------------------------------    font/woff
.zip  -----------------------------------------------------------------------------------------------   application/zip