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";

以下是用于HTTP内容流的正确Microsoft Office MIME类型:

Extension MIME Type
.doc      application/msword
.dot      application/msword

.docx     application/vnd.openxmlformats-officedocument.wordprocessingml.document
.dotx     application/vnd.openxmlformats-officedocument.wordprocessingml.template
.docm     application/vnd.ms-word.document.macroEnabled.12
.dotm     application/vnd.ms-word.template.macroEnabled.12

.xls      application/vnd.ms-excel
.xlt      application/vnd.ms-excel
.xla      application/vnd.ms-excel

.xlsx     application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xltx     application/vnd.openxmlformats-officedocument.spreadsheetml.template
.xlsm     application/vnd.ms-excel.sheet.macroEnabled.12
.xltm     application/vnd.ms-excel.template.macroEnabled.12
.xlam     application/vnd.ms-excel.addin.macroEnabled.12
.xlsb     application/vnd.ms-excel.sheet.binary.macroEnabled.12

.ppt      application/vnd.ms-powerpoint
.pot      application/vnd.ms-powerpoint
.pps      application/vnd.ms-powerpoint
.ppa      application/vnd.ms-powerpoint

.pptx     application/vnd.openxmlformats-officedocument.presentationml.presentation
.potx     application/vnd.openxmlformats-officedocument.presentationml.template
.ppsx     application/vnd.openxmlformats-officedocument.presentationml.slideshow
.ppam     application/vnd.ms-powerpoint.addin.macroEnabled.12
.pptm     application/vnd.ms-powerpoint.presentation.macroEnabled.12
.potm     application/vnd.ms-powerpoint.template.macroEnabled.12
.ppsm     application/vnd.ms-powerpoint.slideshow.macroEnabled.12

.mdb      application/vnd.ms-access

欲了解更多细节，请查看这篇TechNet文章和这篇博客文章。

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"
    }

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";

加载一个。docx文件。

    if let htmlFile = Bundle.main.path(forResource: "fileName", ofType: "docx") {
        let url = URL(fileURLWithPath: htmlFile)
        do{
            let data = try Data(contentsOf: url)
            self.webView.load(data, mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document", textEncodingName: "UTF-8", baseURL: url)
        }catch{
            print("errrr")
        }
    }

或者，如果你在。net v4.5或更高版本中工作，尝试使用System.Web.MimeMapping.GetMimeMapping(yourFileName)来获取MIME类型。这比硬编码字符串要好得多。

更新:在.Net Core中，同样可以使用FileExtensionContentTypeProvider.TryGetContentType()实现。