android中用于填充映射列表mime类型的工作方法。

private static void fileMimeTypeMapping() {
     MIMETYPE_MAPPING.put("3gp", Collections.list("video/3gpp"));
     MIMETYPE_MAPPING.put("7z", Collections.list("application/x-7z-compressed"));
     MIMETYPE_MAPPING.put("accdb", Collections.list("application/msaccess"));
     MIMETYPE_MAPPING.put("ai", Collections.list("application/illustrator"));
     MIMETYPE_MAPPING.put("apk", Collections.list("application/vnd.android.package-archive"));
     MIMETYPE_MAPPING.put("arw", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("avi", Collections.list("video/x-msvideo"));
     MIMETYPE_MAPPING.put("bash", Collections.list("text/x-shellscript"));
     MIMETYPE_MAPPING.put("bat", Collections.list("application/x-msdos-program"));
     MIMETYPE_MAPPING.put("blend", Collections.list("application/x-blender"));
     MIMETYPE_MAPPING.put("bin", Collections.list("application/x-bin"));
     MIMETYPE_MAPPING.put("bmp", Collections.list("image/bmp"));
     MIMETYPE_MAPPING.put("bpg", Collections.list("image/bpg"));
     MIMETYPE_MAPPING.put("bz2", Collections.list("application/x-bzip2"));
     MIMETYPE_MAPPING.put("cb7", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("cba", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("cbr", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("cbt", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("cbtc", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("cbz", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("cc", Collections.list("text/x-c"));
     MIMETYPE_MAPPING.put("cdr", Collections.list("application/coreldraw"));
     MIMETYPE_MAPPING.put("class", Collections.list("application/java"));
     MIMETYPE_MAPPING.put("cnf", Collections.list("text/plain"));
     MIMETYPE_MAPPING.put("conf", Collections.list("text/plain"));
     MIMETYPE_MAPPING.put("cpp", Collections.list("text/x-c++src"));
     MIMETYPE_MAPPING.put("cr2", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("css", Collections.list("text/css"));
     MIMETYPE_MAPPING.put("csv", Collections.list("text/csv"));
     MIMETYPE_MAPPING.put("cvbdl", Collections.list("application/x-cbr"));
     MIMETYPE_MAPPING.put("c", Collections.list("text/x-c"));
     MIMETYPE_MAPPING.put("c++", Collections.list("text/x-c++src"));
     MIMETYPE_MAPPING.put("dcr", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("deb", Collections.list("application/x-deb"));
     MIMETYPE_MAPPING.put("dng", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("doc", Collections.list("application/msword"));
     MIMETYPE_MAPPING.put("docm", Collections.list("application/vnd.ms-word.document.macroEnabled.12"));
     MIMETYPE_MAPPING.put("docx", Collections.list("application/vnd.openxmlformats-officedocument.wordprocessingml.document"));
     MIMETYPE_MAPPING.put("dot", Collections.list("application/msword"));
     MIMETYPE_MAPPING.put("dotx", Collections.list("application/vnd.openxmlformats-officedocument.wordprocessingml.template"));
     MIMETYPE_MAPPING.put("dv", Collections.list("video/dv"));
     MIMETYPE_MAPPING.put("eot", Collections.list("application/vnd.ms-fontobject"));
     MIMETYPE_MAPPING.put("epub", Collections.list("application/epub+zip"));
     MIMETYPE_MAPPING.put("eps", Collections.list("application/postscript"));
     MIMETYPE_MAPPING.put("erf", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("exe", Collections.list("application/x-ms-dos-executable"));
     MIMETYPE_MAPPING.put("flac", Collections.list("audio/flac"));
     MIMETYPE_MAPPING.put("flv", Collections.list("video/x-flv"));
     MIMETYPE_MAPPING.put("gif", Collections.list("image/gif"));
     MIMETYPE_MAPPING.put("gpx", Collections.list("application/gpx+xml"));
     MIMETYPE_MAPPING.put("gz", Collections.list("application/gzip"));
     MIMETYPE_MAPPING.put("gzip", Collections.list("application/gzip"));
     MIMETYPE_MAPPING.put("h", Collections.list("text/x-h"));
     MIMETYPE_MAPPING.put("heic", Collections.list("image/heic"));
     MIMETYPE_MAPPING.put("heif", Collections.list("image/heif"));
     MIMETYPE_MAPPING.put("hh", Collections.list("text/x-h"));
     MIMETYPE_MAPPING.put("hpp", Collections.list("text/x-h"));
     MIMETYPE_MAPPING.put("htaccess", Collections.list("text/plain"));
     MIMETYPE_MAPPING.put("ical", Collections.list("text/calendar"));
     MIMETYPE_MAPPING.put("ics", Collections.list("text/calendar"));
     MIMETYPE_MAPPING.put("iiq", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("impress", Collections.list("text/impress"));
     MIMETYPE_MAPPING.put("java", Collections.list("text/x-java-source"));
     MIMETYPE_MAPPING.put("jp2", Collections.list("image/jp2"));
     MIMETYPE_MAPPING.put("jpeg", Collections.list("image/jpeg"));
     MIMETYPE_MAPPING.put("jpg", Collections.list("image/jpeg"));
     MIMETYPE_MAPPING.put("jps", Collections.list("image/jpeg"));
     MIMETYPE_MAPPING.put("k25", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("kdc", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("key", Collections.list("application/x-iwork-keynote-sffkey"));
     MIMETYPE_MAPPING.put("keynote", Collections.list("application/x-iwork-keynote-sffkey"));
     MIMETYPE_MAPPING.put("kml", Collections.list("application/vnd.google-earth.kml+xml"));
     MIMETYPE_MAPPING.put("kmz", Collections.list("application/vnd.google-earth.kmz"));
     MIMETYPE_MAPPING.put("kra", Collections.list("application/x-krita"));
     MIMETYPE_MAPPING.put("ldif", Collections.list("text/x-ldif"));
     MIMETYPE_MAPPING.put("love", Collections.list("application/x-love-game"));
     MIMETYPE_MAPPING.put("lwp", Collections.list("application/vnd.lotus-wordpro"));
     MIMETYPE_MAPPING.put("m2t", Collections.list("video/mp2t"));
     MIMETYPE_MAPPING.put("m3u", Collections.list("audio/mpegurl"));
     MIMETYPE_MAPPING.put("m3u8", Collections.list("audio/mpegurl"));
     MIMETYPE_MAPPING.put("m4a", Collections.list("audio/mp4"));
     MIMETYPE_MAPPING.put("m4b", Collections.list("audio/m4b"));
     MIMETYPE_MAPPING.put("m4v", Collections.list("video/mp4"));
     MIMETYPE_MAPPING.put("markdown", Collections.list(MIMETYPE_TEXT_MARKDOWN));
     MIMETYPE_MAPPING.put("mdown", Collections.list(MIMETYPE_TEXT_MARKDOWN));
     MIMETYPE_MAPPING.put("md", Collections.list(MIMETYPE_TEXT_MARKDOWN));
     MIMETYPE_MAPPING.put("mdb", Collections.list("application/msaccess"));
     MIMETYPE_MAPPING.put("mdwn", Collections.list(MIMETYPE_TEXT_MARKDOWN));
     MIMETYPE_MAPPING.put("mkd", Collections.list(MIMETYPE_TEXT_MARKDOWN));
     MIMETYPE_MAPPING.put("mef", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("mkv", Collections.list("video/x-matroska"));
     MIMETYPE_MAPPING.put("mobi", Collections.list("application/x-mobipocket-ebook"));
     MIMETYPE_MAPPING.put("mov", Collections.list("video/quicktime"));
     MIMETYPE_MAPPING.put("mp3", Collections.list("audio/mpeg"));
     MIMETYPE_MAPPING.put("mp4", Collections.list("video/mp4"));
     MIMETYPE_MAPPING.put("mpeg", Collections.list("video/mpeg"));
     MIMETYPE_MAPPING.put("mpg", Collections.list("video/mpeg"));
     MIMETYPE_MAPPING.put("mpo", Collections.list("image/jpeg"));
     MIMETYPE_MAPPING.put("msi", Collections.list("application/x-msi"));
     MIMETYPE_MAPPING.put("mts", Collections.list("video/MP2T"));
     MIMETYPE_MAPPING.put("mt2s", Collections.list("video/MP2T"));
     MIMETYPE_MAPPING.put("nef", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("numbers", Collections.list("application/x-iwork-numbers-sffnumbers"));
     MIMETYPE_MAPPING.put("odf", Collections.list("application/vnd.oasis.opendocument.formula"));
     MIMETYPE_MAPPING.put("odg", Collections.list("application/vnd.oasis.opendocument.graphics"));
     MIMETYPE_MAPPING.put("odp", Collections.list("application/vnd.oasis.opendocument.presentation"));
     MIMETYPE_MAPPING.put("ods", Collections.list("application/vnd.oasis.opendocument.spreadsheet"));
     MIMETYPE_MAPPING.put("odt", Collections.list("application/vnd.oasis.opendocument.text"));
     MIMETYPE_MAPPING.put("oga", Collections.list("audio/ogg"));
     MIMETYPE_MAPPING.put("ogg", Collections.list("audio/ogg"));
     MIMETYPE_MAPPING.put("ogv", Collections.list("video/ogg"));
     MIMETYPE_MAPPING.put("one", Collections.list("application/msonenote"));
     MIMETYPE_MAPPING.put("opus", Collections.list("audio/ogg"));
     MIMETYPE_MAPPING.put("orf", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("otf", Collections.list("application/font-sfnt"));
     MIMETYPE_MAPPING.put("pages", Collections.list("application/x-iwork-pages-sffpages"));
     MIMETYPE_MAPPING.put("pdf", Collections.list("application/pdf"));
     MIMETYPE_MAPPING.put("pfb", Collections.list("application/x-font"));
     MIMETYPE_MAPPING.put("pef", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("php", Collections.list("application/x-php"));
     MIMETYPE_MAPPING.put("pl", Collections.list("application/x-perl"));
     MIMETYPE_MAPPING.put("pls", Collections.list("audio/x-scpls"));
     MIMETYPE_MAPPING.put("png", Collections.list("image/png"));
     MIMETYPE_MAPPING.put("pot", Collections.list("application/vnd.ms-powerpoint"));
     MIMETYPE_MAPPING.put("potm", Collections.list("application/vnd.ms-powerpoint.template.macroEnabled.12"));
     MIMETYPE_MAPPING.put("potx", Collections.list("application/vnd.openxmlformats-officedocument.presentationml.template"));
     MIMETYPE_MAPPING.put("ppa", Collections.list("application/vnd.ms-powerpoint"));
     MIMETYPE_MAPPING.put("ppam", Collections.list("application/vnd.ms-powerpoint.addin.macroEnabled.12"));
     MIMETYPE_MAPPING.put("pps", Collections.list("application/vnd.ms-powerpoint"));
     MIMETYPE_MAPPING.put("ppsm", Collections.list("application/vnd.ms-powerpoint.slideshow.macroEnabled.12"));
     MIMETYPE_MAPPING.put("ppsx", Collections.list("application/vnd.openxmlformats-officedocument.presentationml.slideshow"));
     MIMETYPE_MAPPING.put("ppt", Collections.list("application/vnd.ms-powerpoint"));
     MIMETYPE_MAPPING.put("pptm", Collections.list("application/vnd.ms-powerpoint.presentation.macroEnabled.12"));
     MIMETYPE_MAPPING.put("pptx", Collections.list("application/vnd.openxmlformats-officedocument.presentationml.presentation"));
     MIMETYPE_MAPPING.put("ps", Collections.list("application/postscript"));
     MIMETYPE_MAPPING.put("psd", Collections.list("application/x-photoshop"));
     MIMETYPE_MAPPING.put("py", Collections.list("text/x-python"));
     MIMETYPE_MAPPING.put("raf", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("rar", Collections.list("application/x-rar-compressed"));
     MIMETYPE_MAPPING.put("reveal", Collections.list("text/reveal"));
     MIMETYPE_MAPPING.put("rss", Collections.list("application/rss+xml"));
     MIMETYPE_MAPPING.put("rtf", Collections.list("application/rtf"));
     MIMETYPE_MAPPING.put("rw2", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("schema", Collections.list("text/plain"));
     MIMETYPE_MAPPING.put("sgf", Collections.list("application/sgf"));
     MIMETYPE_MAPPING.put("sh-lib", Collections.list("text/x-shellscript"));
     MIMETYPE_MAPPING.put("sh", Collections.list("text/x-shellscript"));
     MIMETYPE_MAPPING.put("srf", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("sr2", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("tar", Collections.list("application/x-tar"));
     MIMETYPE_MAPPING.put("tar.bz2", Collections.list("application/x-bzip2"));
     MIMETYPE_MAPPING.put("tar.gz", Collections.list("application/x-compressed"));
     MIMETYPE_MAPPING.put("tbz2", Collections.list("application/x-bzip2"));
     MIMETYPE_MAPPING.put("tcx", Collections.list("application/vnd.garmin.tcx+xml"));
     MIMETYPE_MAPPING.put("tex", Collections.list("application/x-tex"));
     MIMETYPE_MAPPING.put("tgz", Collections.list("application/x-compressed"));
     MIMETYPE_MAPPING.put("tiff", Collections.list("image/tiff"));
     MIMETYPE_MAPPING.put("tif", Collections.list("image/tiff"));
     MIMETYPE_MAPPING.put("ttf", Collections.list("application/font-sfnt"));
     MIMETYPE_MAPPING.put("txt", Collections.list("text/plain"));
     MIMETYPE_MAPPING.put("vcard", Collections.list("text/vcard"));
     MIMETYPE_MAPPING.put("vcf", Collections.list("text/vcard"));
     MIMETYPE_MAPPING.put("vob", Collections.list("video/dvd"));
     MIMETYPE_MAPPING.put("vsd", Collections.list("application/vnd.visio"));
     MIMETYPE_MAPPING.put("vsdm", Collections.list("application/vnd.ms-visio.drawing.macroEnabled.12"));
     MIMETYPE_MAPPING.put("vsdx", Collections.list("application/vnd.ms-visio.drawing"));
     MIMETYPE_MAPPING.put("vssm", Collections.list("application/vnd.ms-visio.stencil.macroEnabled.12"));
     MIMETYPE_MAPPING.put("vssx", Collections.list("application/vnd.ms-visio.stencil"));
     MIMETYPE_MAPPING.put("vstm", Collections.list("application/vnd.ms-visio.template.macroEnabled.12"));
     MIMETYPE_MAPPING.put("vstx", Collections.list("application/vnd.ms-visio.template"));
     MIMETYPE_MAPPING.put("wav", Collections.list("audio/wav"));
     MIMETYPE_MAPPING.put("webm", Collections.list("video/webm"));
     MIMETYPE_MAPPING.put("woff", Collections.list("application/font-woff"));
     MIMETYPE_MAPPING.put("wpd", Collections.list("application/vnd.wordperfect"));
     MIMETYPE_MAPPING.put("wmv", Collections.list("video/x-ms-wmv"));
     MIMETYPE_MAPPING.put("xcf", Collections.list("application/x-gimp"));
     MIMETYPE_MAPPING.put("xla", Collections.list("application/vnd.ms-excel"));
     MIMETYPE_MAPPING.put("xlam", Collections.list("application/vnd.ms-excel.addin.macroEnabled.12"));
     MIMETYPE_MAPPING.put("xls", Collections.list("application/vnd.ms-excel"));
     MIMETYPE_MAPPING.put("xlsb", Collections.list("application/vnd.ms-excel.sheet.binary.macroEnabled.12"));
     MIMETYPE_MAPPING.put("xlsm", Collections.list("application/vnd.ms-excel.sheet.macroEnabled.12"));
     MIMETYPE_MAPPING.put("xlsx", Collections.list("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"));
     MIMETYPE_MAPPING.put("xlt", Collections.list("application/vnd.ms-excel"));
     MIMETYPE_MAPPING.put("xltm", Collections.list("application/vnd.ms-excel.template.macroEnabled.12"));
     MIMETYPE_MAPPING.put("xltx", Collections.list("application/vnd.openxmlformats-officedocument.spreadsheetml.template"));
     MIMETYPE_MAPPING.put("xrf", Collections.list("image/x-dcraw"));
     MIMETYPE_MAPPING.put("yaml", Arrays.asList("application/yaml", "text/plain"));
     MIMETYPE_MAPPING.put("yml", Arrays.asList("application/yaml", "text/plain"));
     MIMETYPE_MAPPING.put("zip", Collections.list("application/zip"));
     MIMETYPE_MAPPING.put("url", Collections.list("application/internet-shortcut"));
     MIMETYPE_MAPPING.put("webloc", Collections.list("application/internet-shortcut"));
     MIMETYPE_MAPPING.put("js", Arrays.asList("application/javascript", "text/plain"));
     MIMETYPE_MAPPING.put("json", Arrays.asList("application/json", "text/plain"));
     MIMETYPE_MAPPING.put("fb2", Arrays.asList("application/x-fictionbook+xml", "text/plain"));
     MIMETYPE_MAPPING.put("html", Arrays.asList("text/html", "text/plain"));
     MIMETYPE_MAPPING.put("htm", Arrays.asList("text/html", "text/plain"));
     MIMETYPE_MAPPING.put("m", Arrays.asList("text/x-matlab", "text/plain"));
     MIMETYPE_MAPPING.put("svg", Arrays.asList("image/svg+xml", "text/plain"));
     MIMETYPE_MAPPING.put("swf", Arrays.asList("application/x-shockwave-flash", "application/octet-stream"));
     MIMETYPE_MAPPING.put("xml", Arrays.asList("application/xml", "text/plain"));

}

WPS表格:

application/wps-office.xlsx

如果有人想要Dirk Vollmar在c# switch语句中的答案:

case "doc": return "application/msword";
case "dot": return "application/msword";
case "docx": return "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
case "dotx": return "application/vnd.openxmlformats-officedocument.wordprocessingml.template";
case "docm": return "application/vnd.ms-word.document.macroEnabled.12";
case "dotm": return "application/vnd.ms-word.template.macroEnabled.12";
case "xls": return "application/vnd.ms-excel";
case "xlt": return "application/vnd.ms-excel";
case "xla": return "application/vnd.ms-excel";
case "xlsx": return "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
case "xltx": return "application/vnd.openxmlformats-officedocument.spreadsheetml.template";
case "xlsm": return "application/vnd.ms-excel.sheet.macroEnabled.12";
case "xltm": return "application/vnd.ms-excel.template.macroEnabled.12";
case "xlam": return "application/vnd.ms-excel.addin.macroEnabled.12";
case "xlsb": return "application/vnd.ms-excel.sheet.binary.macroEnabled.12";
case "ppt": return "application/vnd.ms-powerpoint";
case "pot": return "application/vnd.ms-powerpoint";
case "pps": return "application/vnd.ms-powerpoint";
case "ppa": return "application/vnd.ms-powerpoint";
case "pptx": return "application/vnd.openxmlformats-officedocument.presentationml.presentation";
case "potx": return "application/vnd.openxmlformats-officedocument.presentationml.template";
case "ppsx": return "application/vnd.openxmlformats-officedocument.presentationml.slideshow";
case "ppam": return "application/vnd.ms-powerpoint.addin.macroEnabled.12";
case "pptm": return "application/vnd.ms-powerpoint.presentation.macroEnabled.12";
case "potm": return "application/vnd.ms-powerpoint.template.macroEnabled.12";
case "ppsm": return "application/vnd.ms-powerpoint.slideshow.macroEnabled.12";
case "mdb": return "application/vnd.ms-access";

这篇文章将探讨在不同的编程语言中获取MIME类型的各种方法，并将它们的CONS作为一行描述作为标题。所以，根据自己的情况使用它们，选择最适合自己的。

如。当用户可能提供.xls， .xlsx或.xlsm中的任何一个，而你不想编写代码测试扩展并为每个扩展提供mime类型时，下面的代码特别有用。让系统来做这项工作。

Python 3

使用python-magic

>>> pip install python-magic
>>> import magic
>>> magic.from_file("Employee.pdf", mime=True)
'application/pdf'

使用内置的MimeTypes模块-将文件名映射到MimeTypes模块

>>> import mimetypes
>>> mimetypes.init()
>>> mimetypes.knownfiles
['/etc/mime.types', '/etc/httpd/mime.types', ... ]
>>> mimetypes.suffix_map['.tgz']
'.tar.gz'
>>> mimetypes.encodings_map['.gz']
'gzip'
>>> mimetypes.types_map['.tgz']
'application/x-tar-gz'

---

JAVA 7

来源:Baeldung关于Java中的文件MIME类型的博客

操作系统相关

@Test
public void get_JAVA7_mimetype() {
    Path path = new File("Employee.xlsx").toPath();
    String mimeType = Files.probeContentType(path);

    assertEquals(mimeType, "application/vnd.ms-excel");
}

它将使用filettypedetector实现探测MIME类型，并调用每个实现的probeContentType来解析该类型。因此，如果文件为实现所知，则返回内容类型。但是，如果没有发生这种情况，则调用系统默认的文件类型检测程序。

---

使用输入流的前几个字符进行解析

@Test
public void getMIMEType_from_Extension(){
    File file = new File("Employee.xlsx");
    String mimeType = URLConnection.guessContentTypeFromName(file.getName());

    assertEquals(mimeType, "application/vnd.ms-excel");
}

---

使用内置的MIME类型表

@Test
public void getMIMEType_UsingGetFileNameMap(){
    File file = new File("Employee.xlsx");
    FileNameMap fileNameMap = URLConnection.getFileNameMap();
    String mimeType = fileNameMap.getContentTypeFor(file.getName());

    assertEquals(mimeType, "image/png");
}

它返回URLConnection的所有实例使用的MIME类型矩阵，然后用于解析输入文件类型。然而，当涉及到URLConnection时，这个MIME类型矩阵是非常有限的。

默认情况下，该类使用content-types。属性文件在JRE_HOME/lib。但是，我们可以通过使用content.types.user.table属性指定一个特定于用户的表来扩展它:

System.setProperty("content.types.user.table","<path-to-file>");

---

JavaScript

来源:FileReader API & Medium关于在JavaScript中使用魔法数字获取Mime类型的文章

解释使用FileReader API获取的魔数

当使用javaScript根据文件流获取MimeType时，最终结果如下所示。打开嵌入式jsFiddle来查看和理解这种方法。

额外的好处:大多数MIME类型都可以访问，你也可以在getMimetype函数中添加自定义MIME类型。此外，它完全支持MS Office文件Mime类型。

在这个例子中，计算文件mime类型的步骤如下:

The user selects a file. Take the first 4 bytes of the file using the slice method. Create a new FileReader instance Use the FileReader to read the 4 bytes you sliced out as an array buffer. Since the array buffer is just a generic way to represent a binary buffer we need to create a TypedArray, in this case an Uint8Array. With a TypedArray at our hands we can retrieve every byte and transform it to hexadecimal (by using toString(16)). We now have a way to get the magic numbers from a file by reading the first four bytes. The final step is to map it to a real mime type.

浏览器支持(总体高于95%，在所有现代浏览器中接近100%):

const uploads = [] const fileSelector = document.getElementById('file-selector') fileSelector.addEventListener('change', (event) => { console.time('FileOpen') const file = event.target.files[0] const filereader = new FileReader() filereader.onloadend = function(evt) { if (evt.target.readyState === FileReader.DONE) { const uint = new Uint8Array(evt.target.result) let bytes = [] uint.forEach((byte) => { bytes.push(byte.toString(16)) }) const hex = bytes.join('').toUpperCase() uploads.push({ filename: file.name, filetype: file.type ? file.type : 'Unknown/Extension missing', binaryFileType: getMimetype(hex), hex: hex }) render() } console.timeEnd('FileOpen') } const blob = file.slice(0, 4); filereader.readAsArrayBuffer(blob); }) const render = () => { const container = document.getElementById('files') const uploadedFiles = uploads.map((file) => { return `<div class=result><hr /> <span class=filename>Filename: <strong>${file.filename}</strong></span><br> <span class=fileObject>File Object (Mime Type):<strong> ${file.filetype}</strong></span><br> <span class=binaryObject>Binary (Mime Type):<strong> ${file.binaryFileType}</strong></span><br> <span class=HexCode>Hex Code (Magic Number):<strong> <em>${file.hex}</strong></span></em> </div>` }) container.innerHTML = uploadedFiles.join('') } const getMimetype = (signature) => { switch (signature) { case '89504E47': return 'image/png' case '47494638': return 'image/gif' case '25504446': return 'application/pdf' case 'FFD8FFDB': case 'FFD8FFE0': case 'FFD8FFE1': return 'image/jpeg' case '504B0304': return 'application/zip' case '504B34': return 'application/vnd.ms-excel.sheet.macroEnabled.12' default: return 'Unknown filetype' } } .result { font-family: Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Georgia, serif; line-height: 20px; font-size: 14px; margin: 10px 0; } .filename { color: #333; font-size: 16px; } .fileObject { color: #a53; } .binaryObject { color: #63f; } .HexCode { color: #262; } em { padding: 2px 4px; background-color: #efefef; font-style: normal; } input[type=file] { background-color: #4CAF50; border: none; color: white; padding: 8px 16px; text-decoration: none; margin: 4px 2px; cursor: pointer; } <body> <input type="file" id="file-selector"> <div id="files"></div>

这里是一个JSON格式的(几乎)完整的文件扩展名的MIME。 你可以做这些例子:MIME["ppt"]， MIME["docx"]，等等

{
    "x3d": "application/vnd.hzn-3d-crossword",
    "3gp": "video/3gpp",
    "3g2": "video/3gpp2",
    "mseq": "application/vnd.mseq",
    "pwn": "application/vnd.3m.post-it-notes",
    "plb": "application/vnd.3gpp.pic-bw-large",
    "psb": "application/vnd.3gpp.pic-bw-small",
    "pvb": "application/vnd.3gpp.pic-bw-var",
    "tcap": "application/vnd.3gpp2.tcap",
    "7z": "application/x-7z-compressed",
    "abw": "application/x-abiword",
    "ace": "application/x-ace-compressed",
    "acc": "application/vnd.americandynamics.acc",
    "acu": "application/vnd.acucobol",
    "atc": "application/vnd.acucorp",
    "adp": "audio/adpcm",
    "aab": "application/x-authorware-bin",
    "aam": "application/x-authorware-map",
    "aas": "application/x-authorware-seg",
    "air": "application/vnd.adobe.air-application-installer-package+zip",
    "swf": "application/x-shockwave-flash",
    "fxp": "application/vnd.adobe.fxp",
    "pdf": "application/pdf",
    "ppd": "application/vnd.cups-ppd",
    "dir": "application/x-director",
    "xdp": "application/vnd.adobe.xdp+xml",
    "xfdf": "application/vnd.adobe.xfdf",
    "aac": "audio/x-aac",
    "ahead": "application/vnd.ahead.space",
    "azf": "application/vnd.airzip.filesecure.azf",
    "azs": "application/vnd.airzip.filesecure.azs",
    "azw": "application/vnd.amazon.ebook",
    "ami": "application/vnd.amiga.ami",
    "N/A": "application/andrew-inset",
    "apk": "application/vnd.android.package-archive",
    "cii": "application/vnd.anser-web-certificate-issue-initiation",
    "fti": "application/vnd.anser-web-funds-transfer-initiation",
    "atx": "application/vnd.antix.game-component",
    "dmg": "application/x-apple-diskimage",
    "mpkg": "application/vnd.apple.installer+xml",
    "aw": "application/applixware",
    "mp3": "audio/mpeg",
    "les": "application/vnd.hhe.lesson-player",
    "swi": "application/vnd.aristanetworks.swi",
    "s": "text/x-asm",
    "atomcat": "application/atomcat+xml",
    "atomsvc": "application/atomsvc+xml",
    "atom": "application/atom+xml",
    "ac": "application/pkix-attr-cert",
    "aif": "audio/x-aiff",
    "avi": "video/x-msvideo",
    "aep": "application/vnd.audiograph",
    "dxf": "image/vnd.dxf",
    "dwf": "model/vnd.dwf",
    "par": "text/plain-bas",
    "bcpio": "application/x-bcpio",
    "bin": "application/octet-stream",
    "bmp": "image/bmp",
    "torrent": "application/x-bittorrent",
    "cod": "application/vnd.rim.cod",
    "mpm": "application/vnd.blueice.multipass",
    "bmi": "application/vnd.bmi",
    "sh": "application/x-sh",
    "btif": "image/prs.btif",
    "rep": "application/vnd.businessobjects",
    "bz": "application/x-bzip",
    "bz2": "application/x-bzip2",
    "csh": "application/x-csh",
    "c": "text/x-c",
    "cdxml": "application/vnd.chemdraw+xml",
    "css": "text/css",
    "cdx": "chemical/x-cdx",
    "cml": "chemical/x-cml",
    "csml": "chemical/x-csml",
    "cdbcmsg": "application/vnd.contact.cmsg",
    "cla": "application/vnd.claymore",
    "c4g": "application/vnd.clonk.c4group",
    "sub": "image/vnd.dvb.subtitle",
    "cdmia": "application/cdmi-capability",
    "cdmic": "application/cdmi-container",
    "cdmid": "application/cdmi-domain",
    "cdmio": "application/cdmi-object",
    "cdmiq": "application/cdmi-queue",
    "c11amc": "application/vnd.cluetrust.cartomobile-config",
    "c11amz": "application/vnd.cluetrust.cartomobile-config-pkg",
    "ras": "image/x-cmu-raster",
    "dae": "model/vnd.collada+xml",
    "csv": "text/csv",
    "cpt": "application/mac-compactpro",
    "wmlc": "application/vnd.wap.wmlc",
    "cgm": "image/cgm",
    "ice": "x-conference/x-cooltalk",
    "cmx": "image/x-cmx",
    "xar": "application/vnd.xara",
    "cmc": "application/vnd.cosmocaller",
    "cpio": "application/x-cpio",
    "clkx": "application/vnd.crick.clicker",
    "clkk": "application/vnd.crick.clicker.keyboard",
    "clkp": "application/vnd.crick.clicker.palette",
    "clkt": "application/vnd.crick.clicker.template",
    "clkw": "application/vnd.crick.clicker.wordbank",
    "wbs": "application/vnd.criticaltools.wbs+xml",
    "cryptonote": "application/vnd.rig.cryptonote",
    "cif": "chemical/x-cif",
    "cmdf": "chemical/x-cmdf",
    "cu": "application/cu-seeme",
    "cww": "application/prs.cww",
    "curl": "text/vnd.curl",
    "dcurl": "text/vnd.curl.dcurl",
    "mcurl": "text/vnd.curl.mcurl",
    "scurl": "text/vnd.curl.scurl",
    "car": "application/vnd.curl.car",
    "pcurl": "application/vnd.curl.pcurl",
    "cmp": "application/vnd.yellowriver-custom-menu",
    "dssc": "application/dssc+der",
    "xdssc": "application/dssc+xml",
    "deb": "application/x-debian-package",
    "uva": "audio/vnd.dece.audio",
    "uvi": "image/vnd.dece.graphic",
    "uvh": "video/vnd.dece.hd",
    "uvm": "video/vnd.dece.mobile",
    "uvu": "video/vnd.uvvu.mp4",
    "uvp": "video/vnd.dece.pd",
    "uvs": "video/vnd.dece.sd",
    "uvv": "video/vnd.dece.video",
    "dvi": "application/x-dvi",
    "seed": "application/vnd.fdsn.seed",
    "dtb": "application/x-dtbook+xml",
    "res": "application/x-dtbresource+xml",
    "ait": "application/vnd.dvb.ait",
    "svc": "application/vnd.dvb.service",
    "eol": "audio/vnd.digital-winds",
    "djvu": "image/vnd.djvu",
    "dtd": "application/xml-dtd",
    "mlp": "application/vnd.dolby.mlp",
    "wad": "application/x-doom",
    "dpg": "application/vnd.dpgraph",
    "dra": "audio/vnd.dra",
    "dfac": "application/vnd.dreamfactory",
    "dts": "audio/vnd.dts",
    "dtshd": "audio/vnd.dts.hd",
    "dwg": "image/vnd.dwg",
    "geo": "application/vnd.dynageo",
    "es": "application/ecmascript",
    "mag": "application/vnd.ecowin.chart",
    "mmr": "image/vnd.fujixerox.edmics-mmr",
    "rlc": "image/vnd.fujixerox.edmics-rlc",
    "exi": "application/exi",
    "mgz": "application/vnd.proteus.magazine",
    "epub": "application/epub+zip",
    "eml": "message/rfc822",
    "nml": "application/vnd.enliven",
    "xpr": "application/vnd.is-xpr",
    "xif": "image/vnd.xiff",
    "xfdl": "application/vnd.xfdl",
    "emma": "application/emma+xml",
    "ez2": "application/vnd.ezpix-album",
    "ez3": "application/vnd.ezpix-package",
    "fst": "image/vnd.fst",
    "fvt": "video/vnd.fvt",
    "fbs": "image/vnd.fastbidsheet",
    "fe_launch": "application/vnd.denovo.fcselayout-link",
    "f4v": "video/x-f4v",
    "flv": "video/x-flv",
    "fpx": "image/vnd.fpx",
    "npx": "image/vnd.net-fpx",
    "flx": "text/vnd.fmi.flexstor",
    "fli": "video/x-fli",
    "ftc": "application/vnd.fluxtime.clip",
    "fdf": "application/vnd.fdf",
    "f": "text/x-fortran",
    "mif": "application/vnd.mif",
    "fm": "application/vnd.framemaker",
    "fh": "image/x-freehand",
    "fsc": "application/vnd.fsc.weblaunch",
    "fnc": "application/vnd.frogans.fnc",
    "ltf": "application/vnd.frogans.ltf",
    "ddd": "application/vnd.fujixerox.ddd",
    "xdw": "application/vnd.fujixerox.docuworks",
    "xbd": "application/vnd.fujixerox.docuworks.binder",
    "oas": "application/vnd.fujitsu.oasys",
    "oa2": "application/vnd.fujitsu.oasys2",
    "oa3": "application/vnd.fujitsu.oasys3",
    "fg5": "application/vnd.fujitsu.oasysgp",
    "bh2": "application/vnd.fujitsu.oasysprs",
    "spl": "application/x-futuresplash",
    "fzs": "application/vnd.fuzzysheet",
    "g3": "image/g3fax",
    "gmx": "application/vnd.gmx",
    "gtw": "model/vnd.gtw",
    "txd": "application/vnd.genomatix.tuxedo",
    "ggb": "application/vnd.geogebra.file",
    "ggt": "application/vnd.geogebra.tool",
    "gdl": "model/vnd.gdl",
    "gex": "application/vnd.geometry-explorer",
    "gxt": "application/vnd.geonext",
    "g2w": "application/vnd.geoplan",
    "g3w": "application/vnd.geospace",
    "gsf": "application/x-font-ghostscript",
    "bdf": "application/x-font-bdf",
    "gtar": "application/x-gtar",
    "texinfo": "application/x-texinfo",
    "gnumeric": "application/x-gnumeric",
    "kml": "application/vnd.google-earth.kml+xml",
    "kmz": "application/vnd.google-earth.kmz",
    "gqf": "application/vnd.grafeq",
    "gif": "image/gif",
    "gv": "text/vnd.graphviz",
    "gac": "application/vnd.groove-account",
    "ghf": "application/vnd.groove-help",
    "gim": "application/vnd.groove-identity-message",
    "grv": "application/vnd.groove-injector",
    "gtm": "application/vnd.groove-tool-message",
    "tpl": "application/vnd.groove-tool-template",
    "vcg": "application/vnd.groove-vcard",
    "h261": "video/h261",
    "h263": "video/h263",
    "h264": "video/h264",
    "hpid": "application/vnd.hp-hpid",
    "hps": "application/vnd.hp-hps",
    "hdf": "application/x-hdf",
    "rip": "audio/vnd.rip",
    "hbci": "application/vnd.hbci",
    "jlt": "application/vnd.hp-jlyt",
    "pcl": "application/vnd.hp-pcl",
    "hpgl": "application/vnd.hp-hpgl",
    "hvs": "application/vnd.yamaha.hv-script",
    "hvd": "application/vnd.yamaha.hv-dic",
    "hvp": "application/vnd.yamaha.hv-voice",
    "sfd-hdstx": "application/vnd.hydrostatix.sof-data",
    "stk": "application/hyperstudio",
    "hal": "application/vnd.hal+xml",
    "html": "text/html",
    "irm": "application/vnd.ibm.rights-management",
    "sc": "application/vnd.ibm.secure-container",
    "ics": "text/calendar",
    "icc": "application/vnd.iccprofile",
    "ico": "image/x-icon",
    "igl": "application/vnd.igloader",
    "ief": "image/ief",
    "ivp": "application/vnd.immervision-ivp",
    "ivu": "application/vnd.immervision-ivu",
    "rif": "application/reginfo+xml",
    "3dml": "text/vnd.in3d.3dml",
    "spot": "text/vnd.in3d.spot",
    "igs": "model/iges",
    "i2g": "application/vnd.intergeo",
    "cdy": "application/vnd.cinderella",
    "xpw": "application/vnd.intercon.formnet",
    "fcs": "application/vnd.isac.fcs",
    "ipfix": "application/ipfix",
    "cer": "application/pkix-cert",
    "pki": "application/pkixcmp",
    "crl": "application/pkix-crl",
    "pkipath": "application/pkix-pkipath",
    "igm": "application/vnd.insors.igm",
    "rcprofile": "application/vnd.ipunplugged.rcprofile",
    "irp": "application/vnd.irepository.package+xml",
    "jad": "text/vnd.sun.j2me.app-descriptor",
    "jar": "application/java-archive",
    "class": "application/java-vm",
    "jnlp": "application/x-java-jnlp-file",
    "ser": "application/java-serialized-object",
    "java": "text/x-java-source,java",
    "js": "application/javascript",
    "json": "application/json",
    "joda": "application/vnd.joost.joda-archive",
    "jpm": "video/jpm",
    "jpeg": "image/x-citrix-jpeg",
    "jpg": "image/x-citrix-jpeg",
    "pjpeg": "image/pjpeg",
    "jpgv": "video/jpeg",
    "ktz": "application/vnd.kahootz",
    "mmd": "application/vnd.chipnuts.karaoke-mmd",
    "karbon": "application/vnd.kde.karbon",
    "chrt": "application/vnd.kde.kchart",
    "kfo": "application/vnd.kde.kformula",
    "flw": "application/vnd.kde.kivio",
    "kon": "application/vnd.kde.kontour",
    "kpr": "application/vnd.kde.kpresenter",
    "ksp": "application/vnd.kde.kspread",
    "kwd": "application/vnd.kde.kword",
    "htke": "application/vnd.kenameaapp",
    "kia": "application/vnd.kidspiration",
    "kne": "application/vnd.kinar",
    "sse": "application/vnd.kodak-descriptor",
    "lasxml": "application/vnd.las.las+xml",
    "latex": "application/x-latex",
    "lbd": "application/vnd.llamagraphics.life-balance.desktop",
    "lbe": "application/vnd.llamagraphics.life-balance.exchange+xml",
    "jam": "application/vnd.jam",
    "123": "application/vnd.lotus-1-2-3",
    "apr": "application/vnd.lotus-approach",
    "pre": "application/vnd.lotus-freelance",
    "nsf": "application/vnd.lotus-notes",
    "org": "application/vnd.lotus-organizer",
    "scm": "application/vnd.lotus-screencam",
    "lwp": "application/vnd.lotus-wordpro",
    "lvp": "audio/vnd.lucent.voice",
    "m3u": "audio/x-mpegurl",
    "m4v": "video/x-m4v",
    "hqx": "application/mac-binhex40",
    "portpkg": "application/vnd.macports.portpkg",
    "mgp": "application/vnd.osgeo.mapguide.package",
    "mrc": "application/marc",
    "mrcx": "application/marcxml+xml",
    "mxf": "application/mxf",
    "nbp": "application/vnd.wolfram.player",
    "ma": "application/mathematica",
    "mathml": "application/mathml+xml",
    "mbox": "application/mbox",
    "mc1": "application/vnd.medcalcdata",
    "mscml": "application/mediaservercontrol+xml",
    "cdkey": "application/vnd.mediastation.cdkey",
    "mwf": "application/vnd.mfer",
    "mfm": "application/vnd.mfmp",
    "msh": "model/mesh",
    "mads": "application/mads+xml",
    "mets": "application/mets+xml",
    "mods": "application/mods+xml",
    "meta4": "application/metalink4+xml",
    "mcd": "application/vnd.mcd",
    "flo": "application/vnd.micrografx.flo",
    "igx": "application/vnd.micrografx.igx",
    "es3": "application/vnd.eszigno3+xml",
    "mdb": "application/x-msaccess",
    "asf": "video/x-ms-asf",
    "exe": "application/x-msdownload",
    "cil": "application/vnd.ms-artgalry",
    "cab": "application/vnd.ms-cab-compressed",
    "ims": "application/vnd.ms-ims",
    "application": "application/x-ms-application",
    "clp": "application/x-msclip",
    "mdi": "image/vnd.ms-modi",
    "eot": "application/vnd.ms-fontobject",
    "xls": "application/vnd.ms-excel",
    "xlam": "application/vnd.ms-excel.addin.macroenabled.12",
    "xlsb": "application/vnd.ms-excel.sheet.binary.macroenabled.12",
    "xltm": "application/vnd.ms-excel.template.macroenabled.12",
    "xlsm": "application/vnd.ms-excel.sheet.macroenabled.12",
    "chm": "application/vnd.ms-htmlhelp",
    "crd": "application/x-mscardfile",
    "lrm": "application/vnd.ms-lrm",
    "mvb": "application/x-msmediaview",
    "mny": "application/x-msmoney",
    "pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
    "sldx": "application/vnd.openxmlformats-officedocument.presentationml.slide",
    "ppsx": "application/vnd.openxmlformats-officedocument.presentationml.slideshow",
    "potx": "application/vnd.openxmlformats-officedocument.presentationml.template",
    "xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "xltx": "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
    "docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "dotx": "application/vnd.openxmlformats-officedocument.wordprocessingml.template",
    "obd": "application/x-msbinder",
    "thmx": "application/vnd.ms-officetheme",
    "onetoc": "application/onenote",
    "pya": "audio/vnd.ms-playready.media.pya",
    "pyv": "video/vnd.ms-playready.media.pyv",
    "ppt": "application/vnd.ms-powerpoint",
    "ppam": "application/vnd.ms-powerpoint.addin.macroenabled.12",
    "sldm": "application/vnd.ms-powerpoint.slide.macroenabled.12",
    "pptm": "application/vnd.ms-powerpoint.presentation.macroenabled.12",
    "ppsm": "application/vnd.ms-powerpoint.slideshow.macroenabled.12",
    "potm": "application/vnd.ms-powerpoint.template.macroenabled.12",
    "mpp": "application/vnd.ms-project",
    "pub": "application/x-mspublisher",
    "scd": "application/x-msschedule",
    "xap": "application/x-silverlight-app",
    "stl": "application/vnd.ms-pki.stl",
    "cat": "application/vnd.ms-pki.seccat",
    "vsd": "application/vnd.visio",
    "vsdx": "application/vnd.visio2013",
    "wm": "video/x-ms-wm",
    "wma": "audio/x-ms-wma",
    "wax": "audio/x-ms-wax",
    "wmx": "video/x-ms-wmx",
    "wmd": "application/x-ms-wmd",
    "wpl": "application/vnd.ms-wpl",
    "wmz": "application/x-ms-wmz",
    "wmv": "video/x-ms-wmv",
    "wvx": "video/x-ms-wvx",
    "wmf": "application/x-msmetafile",
    "trm": "application/x-msterminal",
    "doc": "application/msword",
    "docm": "application/vnd.ms-word.document.macroenabled.12",
    "dotm": "application/vnd.ms-word.template.macroenabled.12",
    "wri": "application/x-mswrite",
    "wps": "application/vnd.ms-works",
    "xbap": "application/x-ms-xbap",
    "xps": "application/vnd.ms-xpsdocument",
    "mid": "audio/midi",
    "mpy": "application/vnd.ibm.minipay",
    "afp": "application/vnd.ibm.modcap",
    "rms": "application/vnd.jcp.javame.midlet-rms",
    "tmo": "application/vnd.tmobile-livetv",
    "prc": "application/x-mobipocket-ebook",
    "mbk": "application/vnd.mobius.mbk",
    "dis": "application/vnd.mobius.dis",
    "plc": "application/vnd.mobius.plc",
    "mqy": "application/vnd.mobius.mqy",
    "msl": "application/vnd.mobius.msl",
    "txf": "application/vnd.mobius.txf",
    "daf": "application/vnd.mobius.daf",
    "fly": "text/vnd.fly",
    "mpc": "application/vnd.mophun.certificate",
    "mpn": "application/vnd.mophun.application",
    "mj2": "video/mj2",
    "mpga": "audio/mpeg",
    "mxu": "video/vnd.mpegurl",
    "mpeg": "video/mpeg",
    "m21": "application/mp21",
    "mp4a": "audio/mp4",
    "mp4": "video/mp4",
    "m3u8": "application/vnd.apple.mpegurl",
    "mus": "application/vnd.musician",
    "msty": "application/vnd.muvee.style",
    "mxml": "application/xv+xml",
    "ngdat": "application/vnd.nokia.n-gage.data",
    "n-gage": "application/vnd.nokia.n-gage.symbian.install",
    "ncx": "application/x-dtbncx+xml",
    "nc": "application/x-netcdf",
    "nlu": "application/vnd.neurolanguage.nlu",
    "dna": "application/vnd.dna",
    "nnd": "application/vnd.noblenet-directory",
    "nns": "application/vnd.noblenet-sealer",
    "nnw": "application/vnd.noblenet-web",
    "rpst": "application/vnd.nokia.radio-preset",
    "rpss": "application/vnd.nokia.radio-presets",
    "n3": "text/n3",
    "edm": "application/vnd.novadigm.edm",
    "edx": "application/vnd.novadigm.edx",
    "ext": "application/vnd.novadigm.ext",
    "gph": "application/vnd.flographit",
    "ecelp4800": "audio/vnd.nuera.ecelp4800",
    "ecelp7470": "audio/vnd.nuera.ecelp7470",
    "ecelp9600": "audio/vnd.nuera.ecelp9600",
    "oda": "application/oda",
    "ogx": "application/ogg",
    "oga": "audio/ogg",
    "ogv": "video/ogg",
    "dd2": "application/vnd.oma.dd2+xml",
    "oth": "application/vnd.oasis.opendocument.text-web",
    "opf": "application/oebps-package+xml",
    "qbo": "application/vnd.intu.qbo",
    "oxt": "application/vnd.openofficeorg.extension",
    "osf": "application/vnd.yamaha.openscoreformat",
    "weba": "audio/webm",
    "webm": "video/webm",
    "odc": "application/vnd.oasis.opendocument.chart",
    "otc": "application/vnd.oasis.opendocument.chart-template",
    "odb": "application/vnd.oasis.opendocument.database",
    "odf": "application/vnd.oasis.opendocument.formula",
    "odft": "application/vnd.oasis.opendocument.formula-template",
    "odg": "application/vnd.oasis.opendocument.graphics",
    "otg": "application/vnd.oasis.opendocument.graphics-template",
    "odi": "application/vnd.oasis.opendocument.image",
    "oti": "application/vnd.oasis.opendocument.image-template",
    "odp": "application/vnd.oasis.opendocument.presentation",
    "otp": "application/vnd.oasis.opendocument.presentation-template",
    "ods": "application/vnd.oasis.opendocument.spreadsheet",
    "ots": "application/vnd.oasis.opendocument.spreadsheet-template",
    "odt": "application/vnd.oasis.opendocument.text",
    "odm": "application/vnd.oasis.opendocument.text-master",
    "ott": "application/vnd.oasis.opendocument.text-template",
    "ktx": "image/ktx",
    "sxc": "application/vnd.sun.xml.calc",
    "stc": "application/vnd.sun.xml.calc.template",
    "sxd": "application/vnd.sun.xml.draw",
    "std": "application/vnd.sun.xml.draw.template",
    "sxi": "application/vnd.sun.xml.impress",
    "sti": "application/vnd.sun.xml.impress.template",
    "sxm": "application/vnd.sun.xml.math",
    "sxw": "application/vnd.sun.xml.writer",
    "sxg": "application/vnd.sun.xml.writer.global",
    "stw": "application/vnd.sun.xml.writer.template",
    "otf": "application/x-font-otf",
    "osfpvg": "application/vnd.yamaha.openscoreformat.osfpvg+xml",
    "dp": "application/vnd.osgi.dp",
    "pdb": "application/vnd.palm",
    "p": "text/x-pascal",
    "paw": "application/vnd.pawaafile",
    "pclxl": "application/vnd.hp-pclxl",
    "efif": "application/vnd.picsel",
    "pcx": "image/x-pcx",
    "psd": "image/vnd.adobe.photoshop",
    "prf": "application/pics-rules",
    "pic": "image/x-pict",
    "chat": "application/x-chat",
    "p10": "application/pkcs10",
    "p12": "application/x-pkcs12",
    "p7m": "application/pkcs7-mime",
    "p7s": "application/pkcs7-signature",
    "p7r": "application/x-pkcs7-certreqresp",
    "p7b": "application/x-pkcs7-certificates",
    "p8": "application/pkcs8",
    "plf": "application/vnd.pocketlearn",
    "pnm": "image/x-portable-anymap",
    "pbm": "image/x-portable-bitmap",
    "pcf": "application/x-font-pcf",
    "pfr": "application/font-tdpfr",
    "pgn": "application/x-chess-pgn",
    "pgm": "image/x-portable-graymap",
    "png": "image/x-png",
    "ppm": "image/x-portable-pixmap",
    "pskcxml": "application/pskc+xml",
    "pml": "application/vnd.ctc-posml",
    "ai": "application/postscript",
    "pfa": "application/x-font-type1",
    "pbd": "application/vnd.powerbuilder6",
    "pgp": "application/pgp-signature",
    "box": "application/vnd.previewsystems.box",
    "ptid": "application/vnd.pvi.ptid1",
    "pls": "application/pls+xml",
    "str": "application/vnd.pg.format",
    "ei6": "application/vnd.pg.osasli",
    "dsc": "text/prs.lines.tag",
    "psf": "application/x-font-linux-psf",
    "qps": "application/vnd.publishare-delta-tree",
    "wg": "application/vnd.pmi.widget",
    "qxd": "application/vnd.quark.quarkxpress",
    "esf": "application/vnd.epson.esf",
    "msf": "application/vnd.epson.msf",
    "ssf": "application/vnd.epson.ssf",
    "qam": "application/vnd.epson.quickanime",
    "qfx": "application/vnd.intu.qfx",
    "qt": "video/quicktime",
    "rar": "application/x-rar-compressed",
    "ram": "audio/x-pn-realaudio",
    "rmp": "audio/x-pn-realaudio-plugin",
    "rsd": "application/rsd+xml",
    "rm": "application/vnd.rn-realmedia",
    "bed": "application/vnd.realvnc.bed",
    "mxl": "application/vnd.recordare.musicxml",
    "musicxml": "application/vnd.recordare.musicxml+xml",
    "rnc": "application/relax-ng-compact-syntax",
    "rdz": "application/vnd.data-vision.rdz",
    "rdf": "application/rdf+xml",
    "rp9": "application/vnd.cloanto.rp9",
    "jisp": "application/vnd.jisp",
    "rtf": "application/rtf",
    "rtx": "text/richtext",
    "link66": "application/vnd.route66.link66+xml",
    "rss": "application/rss+xml",
    "shf": "application/shf+xml",
    "st": "application/vnd.sailingtracker.track",
    "svg": "image/svg+xml",
    "sus": "application/vnd.sus-calendar",
    "sru": "application/sru+xml",
    "setpay": "application/set-payment-initiation",
    "setreg": "application/set-registration-initiation",
    "sema": "application/vnd.sema",
    "semd": "application/vnd.semd",
    "semf": "application/vnd.semf",
    "see": "application/vnd.seemail",
    "snf": "application/x-font-snf",
    "spq": "application/scvp-vp-request",
    "spp": "application/scvp-vp-response",
    "scq": "application/scvp-cv-request",
    "scs": "application/scvp-cv-response",
    "sdp": "application/sdp",
    "etx": "text/x-setext",
    "movie": "video/x-sgi-movie",
    "ifm": "application/vnd.shana.informed.formdata",
    "itp": "application/vnd.shana.informed.formtemplate",
    "iif": "application/vnd.shana.informed.interchange",
    "ipk": "application/vnd.shana.informed.package",
    "tfi": "application/thraud+xml",
    "shar": "application/x-shar",
    "rgb": "image/x-rgb",
    "slt": "application/vnd.epson.salt",
    "aso": "application/vnd.accpac.simply.aso",
    "imp": "application/vnd.accpac.simply.imp",
    "twd": "application/vnd.simtech-mindmapper",
    "csp": "application/vnd.commonspace",
    "saf": "application/vnd.yamaha.smaf-audio",
    "mmf": "application/vnd.smaf",
    "spf": "application/vnd.yamaha.smaf-phrase",
    "teacher": "application/vnd.smart.teacher",
    "svd": "application/vnd.svd",
    "rq": "application/sparql-query",
    "srx": "application/sparql-results+xml",
    "gram": "application/srgs",
    "grxml": "application/srgs+xml",
    "ssml": "application/ssml+xml",
    "skp": "application/vnd.koan",
    "sgml": "text/sgml",
    "sdc": "application/vnd.stardivision.calc",
    "sda": "application/vnd.stardivision.draw",
    "sdd": "application/vnd.stardivision.impress",
    "smf": "application/vnd.stardivision.math",
    "sdw": "application/vnd.stardivision.writer",
    "sgl": "application/vnd.stardivision.writer-global",
    "sm": "application/vnd.stepmania.stepchart",
    "sit": "application/x-stuffit",
    "sitx": "application/x-stuffitx",
    "sdkm": "application/vnd.solent.sdkm+xml",
    "xo": "application/vnd.olpc-sugar",
    "au": "audio/basic",
    "wqd": "application/vnd.wqd",
    "sis": "application/vnd.symbian.install",
    "smi": "application/smil+xml",
    "xsm": "application/vnd.syncml+xml",
    "bdm": "application/vnd.syncml.dm+wbxml",
    "xdm": "application/vnd.syncml.dm+xml",
    "sv4cpio": "application/x-sv4cpio",
    "sv4crc": "application/x-sv4crc",
    "sbml": "application/sbml+xml",
    "tsv": "text/tab-separated-values",
    "tiff": "image/tiff",
    "tao": "application/vnd.tao.intent-module-archive",
    "tar": "application/x-tar",
    "tcl": "application/x-tcl",
    "tex": "application/x-tex",
    "tfm": "application/x-tex-tfm",
    "tei": "application/tei+xml",
    "txt": "text/plain",
    "dxp": "application/vnd.spotfire.dxp",
    "sfs": "application/vnd.spotfire.sfs",
    "tsd": "application/timestamped-data",
    "tpt": "application/vnd.trid.tpt",
    "mxs": "application/vnd.triscape.mxs",
    "t": "text/troff",
    "tra": "application/vnd.trueapp",
    "ttf": "application/x-font-ttf",
    "ttl": "text/turtle",
    "umj": "application/vnd.umajin",
    "uoml": "application/vnd.uoml+xml",
    "unityweb": "application/vnd.unity",
    "ufd": "application/vnd.ufdl",
    "uri": "text/uri-list",
    "utz": "application/vnd.uiq.theme",
    "ustar": "application/x-ustar",
    "uu": "text/x-uuencode",
    "vcs": "text/x-vcalendar",
    "vcf": "text/x-vcard",
    "vcd": "application/x-cdlink",
    "vsf": "application/vnd.vsf",
    "wrl": "model/vrml",
    "vcx": "application/vnd.vcx",
    "mts": "model/vnd.mts",
    "vtu": "model/vnd.vtu",
    "vis": "application/vnd.visionary",
    "viv": "video/vnd.vivo",
    "ccxml": "application/ccxml+xml,",
    "vxml": "application/voicexml+xml",
    "src": "application/x-wais-source",
    "wbxml": "application/vnd.wap.wbxml",
    "wbmp": "image/vnd.wap.wbmp",
    "wav": "audio/x-wav",
    "davmount": "application/davmount+xml",
    "woff": "application/x-font-woff",
    "wspolicy": "application/wspolicy+xml",
    "webp": "image/webp",
    "wtb": "application/vnd.webturbo",
    "wgt": "application/widget",
    "hlp": "application/winhlp",
    "wml": "text/vnd.wap.wml",
    "wmls": "text/vnd.wap.wmlscript",
    "wmlsc": "application/vnd.wap.wmlscriptc",
    "wpd": "application/vnd.wordperfect",
    "stf": "application/vnd.wt.stf",
    "wsdl": "application/wsdl+xml",
    "xbm": "image/x-xbitmap",
    "xpm": "image/x-xpixmap",
    "xwd": "image/x-xwindowdump",
    "der": "application/x-x509-ca-cert",
    "fig": "application/x-xfig",
    "xhtml": "application/xhtml+xml",
    "xml": "application/xml",
    "xdf": "application/xcap-diff+xml",
    "xenc": "application/xenc+xml",
    "xer": "application/patch-ops-error+xml",
    "rl": "application/resource-lists+xml",
    "rs": "application/rls-services+xml",
    "rld": "application/resource-lists-diff+xml",
    "xslt": "application/xslt+xml",
    "xop": "application/xop+xml",
    "xpi": "application/x-xpinstall",
    "xspf": "application/xspf+xml",
    "xul": "application/vnd.mozilla.xul+xml",
    "xyz": "chemical/x-xyz",
    "yaml": "text/yaml",
    "yang": "application/yang",
    "yin": "application/yin+xml",
    "zir": "application/vnd.zul",
    "zip": "application/zip",
    "zmm": "application/vnd.handheld-entertainment+xml",
    "zaz": "application/vnd.zzazz.deck+xml"
}

编辑:

根据@Octo Poulos的建议:

分开jpeg和jpg MIME成两个不同的键 更新MIME的mp4格式为视频/mp4

Swift4

 func mimeTypeForPath(path: String) -> String {
        let url = NSURL(fileURLWithPath: path)
        let pathExtension = url.pathExtension

        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension! as NSString, nil)?.takeRetainedValue() {
            if let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
                return mimetype as String
            }
        }
        return "application/octet-stream"
    }