How to get file extension from content type?
You want to look at file tika-mimetypes.xml -> check out tika's source code and :
org.apache.tika.mime.MimeTypesReader
} else if (nodeElement.getTagName().equals(GLOB_TAG)) {
boolean useRegex = Boolean.valueOf(nodeElement.getAttribute(ISREGEX_ATTR));
types.addPattern(type, nodeElement.getAttribute(PATTERN_ATTR), useRegex);
You can then work wit
org.apache.tika.mime.MimeTypes
private Patterns patterns = new Patterns(registry);
Getting the default file extension for a content-type in JavaScript?
from nginx
types {
text/html html htm shtml;
text/css css;
text/xml xml;
image/gif gif;
image/jpeg jpeg jpg;
application/x-javascript js;
application/atom+xml atom;
application/rss+xml rss;
text/mathml mml;
text/plain txt;
text/vnd.sun.j2me.app-descriptor jad;
text/vnd.wap.wml wml;
text/x-component htc;
image/png png;
image/tiff tif tiff;
image/vnd.wap.wbmp wbmp;
image/x-icon ico;
image/x-jng jng;
image/x-ms-bmp bmp;
image/svg+xml svg;
image/webp webp;
application/java-archive jar war ear;
application/mac-binhex40 hqx;
application/msword doc;
application/pdf pdf;
application/postscript ps eps ai;
application/rtf rtf;
application/vnd.ms-excel xls;
application/vnd.ms-powerpoint ppt;
application/vnd.wap.wmlc wmlc;
application/vnd.google-earth.kml+xml kml;
application/vnd.google-earth.kmz kmz;
application/x-7z-compressed 7z;
application/x-cocoa cco;
application/x-java-archive-diff jardiff;
application/x-java-jnlp-file jnlp;
application/x-makeself run;
application/x-perl pl pm;
application/x-pilot prc pdb;
application/x-rar-compressed rar;
application/x-redhat-package-manager rpm;
application/x-sea sea;
application/x-shockwave-flash swf;
application/x-stuffit sit;
application/x-tcl tcl tk;
application/x-x509-ca-cert der pem crt;
application/x-xpinstall xpi;
application/xhtml+xml xhtml;
application/zip zip;
application/octet-stream bin exe dll;
application/octet-stream deb;
application/octet-stream dmg;
application/octet-stream eot;
application/octet-stream iso img;
application/octet-stream msi msp msm;
audio/midi mid midi kar;
audio/mpeg mp3;
audio/ogg ogg;
audio/x-realaudio ra;
video/3gpp 3gpp 3gp;
video/mpeg mpeg mpg;
video/quicktime mov;
video/x-flv flv;
video/x-mng mng;
video/x-ms-asf asx asf;
video/x-ms-wmv wmv;
video/x-msvideo avi;
video/mp4 m4v mp4;
}
C# Get file extension by content type
The "Best" solution that I know of is to query the registry. You can find example code here.
http://cyotek.com/blog/mime-types-and-file-extensions
public static string GetDefaultExtension(string mimeType)
{
string result;
RegistryKey key;
object value;
key = Registry.ClassesRoot.OpenSubKey(@"MIME\Database\Content Type\" + mimeType, false);
value = key != null ? key.GetValue("Extension", null) : null;
result = value != null ? value.ToString() : string.Empty;
return result;
}
How to determine appropriate file extension from MIME Type in Java
As some of the commentors have pointed out, there is no universal 1:1 mapping between mimetypes and file extensions... Some mimetypes have more than one possible extension, many extensions are shared by multiple mimetypes, and some mimetypes have no extension.
Wherever possible, you're much better off storing the mimetype and using that going forward, and forgetting about the extension.
That said, if you do want to get the most common file extension for a given mimetype, then Tika is a good way to go. Apache Tika has a very large set of mimetypes it knows about, and for many of these it also knows mime magic for detection, common extensions, descriptions etc.
If you want to get the most common extension for a JPEG file, then as shown in this Apache Tika unit test you just need to do something like:
MimeTypes allTypes = MimeTypes.getDefaultMimeTypes();
MimeType jpeg = allTypes.forName("image/jpeg");
String jpegExt = jpeg.getExtension(); // .jpg
assertEquals(".jpg", jpeg.getExtension());
The key thing is that you need to load up the xml file that's bundled in the Tika jar to get the definitions of all the mimetypes. If you might be dealing with custom mimetypes too, then Tika supports those, and change line one to be:
TikaConfig config = TikaConfig.getDefaultConfig();
MimeTypes allTypes = config.getMimeRepository();
By using the TikaConfig method to get the MimeTypes, Tika will also check your classpath for custom mimetype defintions, and include those too.
Java: A way to match Mime (content) type to file extension from CommonsMultipartFile
Java library for that case is quite limited (number of types). This is how I do it:
static String getMimeType(String fileName) {
// 1. first use java's built-in utils
FileNameMap mimeTypes = URLConnection.getFileNameMap();
String contentType = mimeTypes.getContentTypeFor(fileName);
// 2. nothing found -> lookup our in extension map to find types like ".doc" or ".docx"
if (contentType == null) {
String extension = fileName.substring(fileName.lastIndexOf('.') + 1, fileName.length());;
contentType = fileExtensionMap.get(extension);
}
return contentType;
}
step 2 involves having a static map:
private static final Map<String, String> fileExtensionMap;
static {
fileExtensionMap = new HashMap<String, String>();
// MS Office
fileExtensionMap.put("doc", "application/msword");
fileExtensionMap.put("dot", "application/msword");
fileExtensionMap.put("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document");
fileExtensionMap.put("dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template");
fileExtensionMap.put("docm", "application/vnd.ms-word.document.macroEnabled.12");
fileExtensionMap.put("dotm", "application/vnd.ms-word.template.macroEnabled.12");
fileExtensionMap.put("xls", "application/vnd.ms-excel");
fileExtensionMap.put("xlt", "application/vnd.ms-excel");
fileExtensionMap.put("xla", "application/vnd.ms-excel");
fileExtensionMap.put("xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
fileExtensionMap.put("xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template");
fileExtensionMap.put("xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12");
fileExtensionMap.put("xltm", "application/vnd.ms-excel.template.macroEnabled.12");
fileExtensionMap.put("xlam", "application/vnd.ms-excel.addin.macroEnabled.12");
fileExtensionMap.put("xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12");
fileExtensionMap.put("ppt", "application/vnd.ms-powerpoint");
fileExtensionMap.put("pot", "application/vnd.ms-powerpoint");
fileExtensionMap.put("pps", "application/vnd.ms-powerpoint");
fileExtensionMap.put("ppa", "application/vnd.ms-powerpoint");
fileExtensionMap.put("pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation");
fileExtensionMap.put("potx", "application/vnd.openxmlformats-officedocument.presentationml.template");
fileExtensionMap.put("ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow");
fileExtensionMap.put("ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12");
fileExtensionMap.put("pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12");
fileExtensionMap.put("potm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12");
fileExtensionMap.put("ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12");
// Open Office
fileExtensionMap.put("odt", "application/vnd.oasis.opendocument.text");
fileExtensionMap.put("ott", "application/vnd.oasis.opendocument.text-template");
fileExtensionMap.put("oth", "application/vnd.oasis.opendocument.text-web");
fileExtensionMap.put("odm", "application/vnd.oasis.opendocument.text-master");
fileExtensionMap.put("odg", "application/vnd.oasis.opendocument.graphics");
fileExtensionMap.put("otg", "application/vnd.oasis.opendocument.graphics-template");
fileExtensionMap.put("odp", "application/vnd.oasis.opendocument.presentation");
fileExtensionMap.put("otp", "application/vnd.oasis.opendocument.presentation-template");
fileExtensionMap.put("ods", "application/vnd.oasis.opendocument.spreadsheet");
fileExtensionMap.put("ots", "application/vnd.oasis.opendocument.spreadsheet-template");
fileExtensionMap.put("odc", "application/vnd.oasis.opendocument.chart");
fileExtensionMap.put("odf", "application/vnd.oasis.opendocument.formula");
fileExtensionMap.put("odb", "application/vnd.oasis.opendocument.database");
fileExtensionMap.put("odi", "application/vnd.oasis.opendocument.image");
fileExtensionMap.put("oxt", "application/vnd.openofficeorg.extension");
// Other
fileExtensionMap.put("txt", "text/plain");
fileExtensionMap.put("rtf", "application/rtf");
fileExtensionMap.put("pdf", "application/pdf");
}
works fine for me, hope that helps!
How to get the File's Content Type in asp.net mvc 5
Are you looking for the file extension or the content-type (mime-type) of the file?
If you are looking for the file extension you can use Path.GetExtension:
var fileExt = Path.GetExtension(Server.MapPath("a.txt"));
// returns ".txt"
If you are looking for file mime type make use of MimeMapping.GetMimeMapping
var mimeType = MimeMapping.GetMimeMapping("a.txt");
// returns "plain/text"
How to get type of file?
You can make use of the mime package from the Dart team to extract the MIME types from file names:
import 'package:mime/mime.dart';
final mimeType = lookupMimeType('/some/path/to/file/file.jpg'); // 'image/jpeg'
Helper functions
If you want to know whether a file path represents an image, you can create a function like this:
import 'package:mime/mime.dart';
bool isImage(String path) {
final mimeType = lookupMimeType(path);
return mimeType.startsWith('image/');
}
Likewise, if you want to know if a path represents a document, you can write a function like this:
import 'package:mime/mime.dart';
bool isDocument(String path) {
final mimeType = lookupMimeType(path);
return mimeType == 'application/msword';
}
You can find lists of MIME types at IANA or look at the extension map in the mime package.
From file headers
With the mime package, you can even check against header bytes of a file:
final mimeType = lookupMimeType('image_without_extension', headerBytes: [0xFF, 0xD8]); // jpeg
Related Topics
How to Inject a Map Using the @Value Spring Annotation
How to Extract Ip Address in Spring MVC Controller Get Call
Can a @Manytoone JPA Relation Be Null
How to Reconnect Kafka Producer Once Closed
How Find Given Number Is Octal or Not
Converting Number Representing a Date in Excel to a Java Date Object
Correct Way to Implement Http Connection Pooling
How to Initialize a Byte Array in Java
Badpaddingexception Decrypting the Encrypted Data in Android
Removing a Column in Java from a 2D Array
In Activity.Oncreate(), Why Does Intent.Getextras() Sometimes Return Null
Why Is Git Bash Not Using the Correct Java Path as Defined in the Path Environment Variable
I Want to Execute Code Every X Seconds, But Handler.Postdelayed Not Working
Java.Lang.Noclassdeffounderror: Com/Fasterxml/Jackson/Databind/Exc/Invaliddefinitionexception
Find Maximum Score or the Maximum Average Score of Candidate Scores Given in Two Dim Array