常见文件类型

application/msword    word(.doc)
application/vnd.ms-powerpoint    powerpoint(.ppt)
application/vnd.ms-excel    excel(.xls)
application/vnd.openxmlformats-officedocument.wordprocessingml.document    word(.docx)
application/vnd.openxmlformats-officedocument.presentationml.presentation    powerpoint(.pptx)
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet    excel(.xlsx)
application/x-rar-compressed    rar
application/zip    zip
application/pdf    pdf
video/*    视频文件
image/*    图片文件
text/plain    纯文本
text/css    css文件
text/html    html文件
text/x-java-source    java源代码
text/x-csrc    c源代码
text/x-c++src    c++源代码