They aren't found in the file itself. Java file upload getcontentType mimetype. jpg -> fake. guessContentTypeFromStream(new ByteArrayInputStream(bytes)); This doesn't support all file types, like pdf for example. read(new File (filePath); Later on, I want to save it to a byte array, but the ImageIO. It uses the . Oct 8, 2019 · Getting a File’s Mime Type in Java 1. Nov 15, 2009 · 3. Here is an example of checking a file input has changed, looping through the files object and getting the MIME type for each file. With the mime package, you can even check against header bytes of a file: final mimeType = lookupMimeType('image_without_extension', headerBytes: [0xFF, 0xD8]); // jpeg Dec 8, 2012 · All I want is just get the file type from file content(not by using file extension which is not very reliable). xslx. gz or . String ext = Arrays. The web api just support json or xml types by default. zip. String base64 = (String)bodyPart. probeContentType(path); System. The standard Media Type (formerly known as MIME types) is application/pdf. If you get the image from a URL, that means you can access the image through an InputStream. Mar 28, 2018 · Is it possible to extract metadata and detect mime type from single file read? This is working for most of the files. It also won't accidentally get things up the prototype chain. It should actually inspect the file because filenames aren't an accurate indicator. Jan 8, 2022 · The above method finds mime type in most of the cases but return Null pointer exception when I upload an audio file with '. I have no problem in storing it in disk, but getting the extension of the file. Also, you can find below AWS SDK for Java 1. Add("ContentType", "video/mp4"). A client is supposed to upload a compressed file into an S3 folder. nio. getExtension(); // . – villecoder Commented Nov 17, 2022 at 15:32 Oct 5, 2020 · MimetypesFileTypeMap. dir Aug 8, 2010 · Since you're writing a file server, you can just pass in the path to the file in the getMimeType method of the ServletContext, and it should return the mimeType, if it can determine it. Here you can find the source of getMimeType(File file) HOME; Java; F; File Mime Type; getMimeType(File file) Description get Mime Type License Open Source License Nov 9, 2012 · 10. May 29, 2018 · 1. Quick solution: Practical example To find MIME Type The MIME type is . getFileNameMap(); /**/*w w w. I was reading about other options like tika which requires too many files (like 20) which is too much for this single purpose and JMimeMagic which requires apache-oro which is a dead project hence I don't like the idea either. If you are curious as to why, I have JavaMaildir set up, and need to populate it's inbox with emails for testing purposes. – Dec 10, 2014 · I don't know if OS X has a mime. Because of the problems with Mime Magic and globs when it comes to detecting container formats, it was decided to add some new detectors to Tika to handle these. When requests are made to search for MIME types in the MimetypesFileTypeMap, it searches MIME types files in the following Oct 19, 2015 · @Jaco It wouldn't if a string comparison is made. probeContentType // using java 7 probeContentType String mimeType = Files. If your are using Java you could use Apache Tika, which is a powerful library for dealing with file types. String type = null; String extension = MimeTypeMap. java. doc extension? You could get the content type: multipartFile. I put it like this. There is also the option of accessing it if it is a file input. decode. guessContentTypeFromName(path); System. Note that Apache Tika might have some issue with thread safety. This will work great if know that you only expect or wish to allow certain types. util. g. //url = file path or whatever suitable URL you want. 5: string mimeType = MimeMapping. it's already decoded to pixels, and is not in a file format like JPEG, PNG or GIF. Getting the extension to a mime type. mime types. I would do it with the magic numbers but I couldn't find a list where all magic numbers from all mime-types/file extensions are listed. As such, unless you go through and try and decode the string to all known valid file types (which is not really a workable solution) there's no way to do what you need. Different file formats have different “magic numbers” at the beginning of the file, which can be used to identify the file format. e. probeContentType(document. Jun 10, 2017 · I found a list which might be very useful to some. This is a custom mime-type, and describes clipboard data represented by the java. x. a two-part identifier for file formats and format contents transmitted on the Internet. Using Apache Tika you can get the file mime-type for most common files, and from that you can extract the file extension. Based on this answer you need to get the Mimetype like below. but while i use mime types little bugy in getting extension image/x-icon. Long answer: You can guess what mime type the file is supposed to be by looking at the extension and file contents. Oct 30, 2013 · 3. console. println("Mime Type of " + f. The MimetypesFileTypeMap looks in various places in the user's system for MIME types file entries. j a v a2 s. getString (cursor. net package. Jun 22, 2022 · "The means by which a file type detector determines the file type is highly implementation specific. getMimeType(fileName); Mar 18, 2018 · NOTE: If you want to determine ContentType correctly, you should be careful about file extensions. This class extends FileTypeMap and provides data typing of files via their file extension. Jun 26, 2015 · Java 7 Files. I searched in File Java docs but couldn' find any method. getContent() is providing the same InputStream as whole MIME message when I expect just a content (without content-type, boundaries etc) when attachment contains whole MIME multipart body section including content-type, etc. jpeg” or “. getContent(); The mapping used by mime. suspend fun getContentType(@Url url: String): Response<Unit>. If we want to show 'video/mp4' type, we need to add the corresponding content type for it. getContentType(url). DataSource source = new FileDataSource(new File("base64Test. We’ll focus on four major approaches to Jun 10, 2015 · Files do not generally have a mime type stored with them. We’ll look at ways to extend the MIME types available to the strategies, wherever applicable. types file. jpg might let you access a . saveChanges() on the enclosing message, which will update the headers by cascading down the MIME structure into a call to MimeBodyPart. Mar 14, 2012 · System. log(data. Sep 17, 2019 · 1. Then you call it like this to get the content type header: api. I am trying to figure out the best way to determine a file extension given a mime type in android. Here are the options to establish the mime type of a file: Using javax. NET Framework 4. Jun 21, 2018 · I want to get mimetype of a file can anyone please help me I want MIME Type like this File file=new File("example. png -> fake. File to easily get the filename). TikaInputStream tikaStream = null; File file = new File(args[0]); Jan 11, 2014 · Java's FileTypeDetector does not support the detection of the p7s file format out of the box. File file = new File(filePath); InputStream inputStream = new FileInputStream(file); String fileName = file. javamail. getName()). See here for a catalog of common Dec 4, 2010 · Create a file mime. is = new BufferedInputStream(new FileInputStream(fileName)); String mimeType = URLConnection. b64toBlob(base64)) Emulate click on <a> tag with created URL. getFileExtensionFromUrl(), it seems not to be able to handle all filenames. Sep 18, 2012 · Be careful with MimeTypeMap. prop('files')[0]. String mimeType = Files. Syntax: The FileNameMap Interface consists of only one method named as: getContentTypeFor (String fileName Jun 20, 2012 · This is a java library I've found that seems to achieve what I need 'extract the mimetype from the magic number'. Also, you can try one of the following: ZIP the file before upload, then unzip on the server and test mime type. assertEquals(". file. Lines that have a mimetype but no associated Aug 26, 2010 · Here is another one-liner for Java 8. mime. For some files, the mime_type is specified (e. (That said, if you want to do a full detection, potentially involving some parsing of the File using extra logic in the Tika Parsers jar for container-based formats, you should be using TikaConfig. bin")); bodyPart. getName(); String fileType = FacesContext. log(data) To get extenstions. MediaColumns. java taken from Jetty 3. getDefaultMimeTypes(); MimeType jpeg = allTypes. Prepare 3 files with the correct extension, then copy these files and rename them: real. I've never really dealt with reading files and all this, so any help would be great thanks. When requests are made to search for MIME types in the MimetypesFileTypeMap, it searches MIME types files in the following order: Sep 4, 2008 · From Python docs:. Console. From file headers. types in the format shown in MimetypesFileTypeMap's javadoc (I started with a large list from the net, massaged it, and added types I found missing). trim(); Of course, don't forget about null-check before getting value of the header (in case the content-type header is not sent by server). reduce((a,b) -> b). getValue(). Originally we told our client to compress its files into a ZIP file, but this proved too difficult for our client. getProperty("user. For example, on my emulator, photos taken with the camera contain commas and spaces in the filename, which causes this method to return an empty String. Your issue is that MIME type checks in java are based on file extension. getContentType(file. application/pdf, image/png) in a column 'mime_type'. split(";")[0]. Searching I found the following: URLConnection. It certainly does. Jan 4, 2018 · To get the file mime type i'm trying to use : String mimeType = new MimetypesFileTypeMap(). 0 Jul 13, 2010 · At first, I want to make sure you know it's impossible to find out what kind of file a URI links too, since a link ending with . println(mimeType); Dec 21, 2011 · First it tries to get the type using URLConnection. Nov 3, 2011 · 1. All source code is here. bzip2. IOException; import java. if the bytes came from a file you could use probeContentType directly on it. Jan 12, 2021 · From a database migration, we have a data-dump in a postgreSQL database. See below. Upload through scalable 3rd party solution e. write method requires me to pick either a GIF, PNG, or JPG format to write my image as (as described in the tutorial here ). setMimeType(mimeTypesMap. The file . Thanks in advance. Jun 16, 2020 · // This is the object created BodyPart messageBodyPart = new MimeBodyPart(); messageBodyPart. jpg extension but the data might not be image/jpg at all – it could be anything in theory. Map; /** * Known mime types. I suggest just leaving the check off entirely, as the mime type is derived from the suffix of the file anyway, thus containing no actual information about the file contents. m4a' as extension. Also, prepare some files to test whether the system determines correctly or not. getProperty("file. "sharath. getMimeTypeFromExtension(extension. getDefaultConfig(); Jun 17, 2014 · I have tried all the following: import java. Jun 22, 2017 · A browser may append the wrong type based on the file's extension (e. forName("image/jpeg"); String jpegExt = jpeg. val extension = MimeTypeMap. getFileExtensionFromUrl(url); if Jan 28, 2022 · For example, a file might have a . To go from MIME to file extension, you can look at the keys under. htaccess files), thus it isn't a rock solid solution to fetch the real extension from the URI if you want to limit allowed file types, if this is what you're going for Dec 14, 2015 · 1954. setDataHandler(new DataHandler(source)); Then, I want to decode it using the method BASE64DecoderStream. String format = null; BufferedImage bufferedimage = null; try (ImageInputStream iis = ImageIO. Mime types are just standardized identifiers that associate different types of file endings, such as jpg and jpeg together. Guess the type of a file based on its filename, path or URL, given by url. indexOf("video") == 0; Hope this helps. getContentType() Dec 16, 2019 · I am trying to get the mime type of the file in android and I'm able to get the mime type using this code . types file format, and most of the content, is taken from the Apache HTTP server's mime. getContentType(f)); Aug 4, 2021 · I only have the Base64 string and the filename. A base64 encoded string can contain anything, and you would need to know its MIME type in advance to decode it properly. worksheet. – 1. jpg", jpeg. Each web server seems to maintain its own list. A simple implementation might examine the file extension (a convention used in some platforms) and map it to a file type. There is a way to do that using Java 7, but it is kind of clumsy (um tanto "desajeitado"): write the bytes to a (temporary) file, use Files. setContentType(mimeType); // HttpServletResponse object. out. Currently I'm using the following which seems to be very hit or miss. Aug 18, 2013 · Open the snippet, run it, and you should see three remote images of different types displayed. println(mimeType); return mimeType != null && mimeType. At the top you can select a local image or data file, and the file signature and/or MIME type will be displayed. BufferedInputStream; import java. Java's activation library has MimetypesFileTypeMap but that goes File Ext -> Mime Type. So, unless some of the file type detecting libraries out there do support the p7s format you are pretty much on your own. toLowerCase()) But the issue is if the file name contains space or other special character 3. Use MimeTypeMap package, which provides a huge two-way mapping of file extensions to mime types and mime types to file extensions. Use the System. We’ll also point out where we should favor one… Continue Reading java-file-mime-type Feb 1, 2018 · So it seems that your issue is more related with web api, instead of Azure. You could add content type like this :response. toPath()); it always returns null. But given a MimeType or (in HTTP terms: content type) how do I get a list of file extensions. com Jan 27, 2013 · Curious what the best way is in Java to get the mime-type of a file. jpg. x automatically defined content type vs Files Mar 17, 2017 · Here my requirement is to upload the file and to store it in the disk. setText("This is a message body"); Multipart multipart = new MimeMultipart(); // you add a reference to this object into the multipart multipart. extensions[0]) another one is mime-types derived from mime-db. String mimeType = URLConnection. txt doesn't exist then check if . You need two things to detect a file's type: The file's name. That means if you don't need to exchange this file via internet protocols (e. MimetypesFileTypeMap mimeTypesMap = new MimetypesFileTypeMap(); doc. the file extension. FileNameMap provides a mechanism to map between a file name and a MIME type string. To check mime type you can use the below function and change the type of your own use. Any blank lines in the file are ignored, as are lines starting with # which are considered comments. Case 2 : Tika tika = new Tika(); String mimeType = tika. The format for mime type setting documents is: mimetype + extension ( + extension)*. In order to run actual file analysis try Apache Tika Mime Magic Detection. You can find a more complete (but still incomplete) list of MIME-Types here from the official Mozilla Developers Network. When i try to use . With it you can easily get the preferred extension related to a mime type with a couple of rows: TikaConfig config = TikaConfig. WriteLine("txt -> " + MimeTypeMap. DataFlavor. Instead it submitted a RAR file with ZIP extension The MIME types file in the config directory contains mappings between the Multipurpose Internet Mail Extensions (MIME) types and file extensions. String mimeType = contentType. S3 bucket. updateHeaders() on your body part. File The mime. Some binary files have what are called "magic numbers" which can, to some degree, be used to identify the contents of the file. headers()["content-type"] . I need Mime Type -> File Ext. Now you can add that in your code by opening your mime. EDIT: Dec 14, 2018 · But bodyPart. pdf will be reported as a PDF, even if the file is an excel spreadsheet). getBytes()); Above method returns a mime type in all cases, but it returns wrong mime type in most of the cases. types file, which associates file extensions with MIME types. Apr 4, 2011 · Using these, you can do mime type magic based detection, and get information on the mime types and their relationships. Image class. Jun 13, 2020 · You can find lists of MIME types at IANA or look at the extension map in the mime package. From that you can use ImageIO to get the image type (format) and with the following code, create a BufferedImage at the same time. getName() + " is " +. */ private static final FileNameMap MIMETYPES = URLConnection . bzip2 file exists and hence I am looking to check the extension of the file. getFileExtensionFromUrl(file) val fileType = MimeTypeMap. File; import java. mail. In JavaScript, we can access the mime type of a user uploaded file with the . htm to the type text/html: type=text/html exts=htm,html. jpe“. guessContentTypeFromStream(is); Nov 29, 2023 · A single MIME type can be associated with multiple file extensions. The assignment is defined in RFC 3778, The application/pdf Media Type, referenced from the Media Types registry. Jul 19, 2021 · If you are getting the list of video/image in this way using the ccontent resolver and cursor then please try below way private val PROJECTION = arrayOf (MediaStore. MIME_TYPE) String pictureType = cursor. You need to infer the type from the file extension, the content of the file, or from some external information you have about the file. Can you please let me know? My requirement is to show the file on the UI , if . guessContentTypeFromStream but if this fails or returns null it tries to get the mimetype on Android O and above using. ConfigurableMimeFileTypeMap; import javax. edited Jul 23, 2020 at 11:48. import java. The task is to write a script in java or groovy in order to read out the files in the correct format and save them to the server. Headers. I want to pick the same file type as the original image. Java get file type from content using mimeutil I am looking among the standard libraries (like apache commons, jax, jboss, javax) for an interface or enum that lists the values of all the standard mime-type (aka content-type). String extension = MimeTypeMap. Call MimeMessage. addBodyPart(messageBodyPart); DataSource source = new FileDataSource(new File(System. There are tons of ways to get the Mime Type from a given InputStream or File. HTTP), that type is absolutely irrelevant. detect(file. exe file (this is especially true for URL's, due to symbolic links and . You can choose to store it in any format you like. In this tutorial, we’ll explore different methods for determining the file extension for a particular MIME type in Java. GetMimeType("txt")); // "text/plain". ")). , 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ import java. public boolean isVideoFile(String path) {. You can select right one from the below listed, which suits your needs. URLConnection ; public class Main {. HashMap; import java. always gives extension based on the extension passed How to check if some one passing javascript file with extension changed as pdf. getContentType(document); but it always returns application octet stream. In other cases, the file type may be stored as a file attribute or the bytes in a file may be examined to guess its file type. The bytes aren't always needed; for speed, you can pass a callback instead of the actual The MimetypesFileTypeMap looks in various places in the user's system for MIME types file entries. getType is based on the Apache web server's mime. Aug 24, 2018 · 1. May 17, 2016 · 2. Screenshot. " Then you can extract mime type itself as the content-type may include encoding as well. Use reduce to get the last element of the stream, i. encoding") returns your os default encoding. jpeg"); String MimeTypeOfFile=/*files mimetype*/; Thank You in Advance Feb 18, 2019 · 1. orElse(null) It works as follows: Split the string into an array of strings using ". real. GetMimeMapping(fileName); If you need to add custom mappings you probably can use reflection to add mappings to the BCL MimeMapping class, it uses a custom dictionary that exposes this method, so you should invoke Nov 27, 2015 · BufferedImage image = ImageIO. Short answer: You can't. txt. imageFlavor always has the mime-type "image/x-java-image". If you are getting it from a servlet then it is accessable through the HttpServerRequest object that is an argument of doPost. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc. MimetypesFileTypeMap, like: System. Mozilla Firefox recognizes the type of file and offers to download file with correct extension and it's good, but Chrome offers to download txt file regardless the real file type and it's Jun 30, 2022 · I need to know what the extension of the read file is, so I can name the file with the extension correctly. Here May 7, 2019 · 1. This is typically coming in the form of a content uri so I get the mime type as follows: ContentResolver contentResolver = context. We can use FileNameMap getContentTypeFor method to get the MIME type of the specified file. io Feb 17, 2011 · 64. Going forward you need to keep the MIME type prefix Nov 12, 2009 · There is no official list of file extension to mime type mappings. Rather, it is typically configured and provided by the server from which the file is accessed; through an HTTP header for example. GetMimeMapping method, that is part of the BCL in . js"; String mimeType = getServletContext(). zip - ContentType. The problem is when I click on upload and proc Jul 4, 2013 · I want to read this file in and convert it into a MimeMessage. You can use the mime type instead of trying to guess by the file extensions, that may be missing in some cases. jpg“, “. If you want to add additional mappings or override existing ones, you can use the mime. i want to get each any every file encoding type runtime. /** For looking up file mime types. getCurrentInstance(). getExtension()); Jan 5, 2011 · It depends on where you are getting the input stream from. It's this updateHeaders call that transfers the content type from the DataHandler to the part's MIME Content-Type header. * Calls getContentType(file. springframework. getMimeType(path); resp. new MimetypesFileTypeMap(). String path = "/js/example. gz exists and if that doesnt exist then check if . For instance, the “image/jpeg” MIME type encompasses extensions like “. When requests are made to search for MIME types in the MimetypesFileTypeMap, it searches MIME types files in the following order: Programmatically added entries to the MimetypesFileTypeMap instance. c o m*/. types in the user's home directory. file; Keep in mind the extension to mime type makes no guarantees Dec 17, 2010 · 3. As far as I know, there is no built-in Java class for getting MIME-type↔extension mappings in Windows. net. MimeMapping. 8. getType(uri); From there I have been using MimeTypeMap: No library can figure out MIME types perfectly. Oct 13, 2021 · After uploading the file, the system will return the MIME type identified by the backend. InputStream is from This is probably OS and possibly browser dependent, but on Windows, the MIME type for a given file extension can be found by looking in the registry under HKCR: For example: HKEY_CLASSES_ROOT. But there's a standard, called shared-mime-info . The built-in mime-type list is very limited but a mechanism is available to add very easily more Mime Types/extensions. * @param file. MimetypesFileTypeMap; MimeUtil with all available subclass of MimeDetector I found; Apache Tika; Apache POI scratchpad; Here the test class: Jan 3, 2013 · This information can only be extracted based on the filePath (and with little help of java. define() method to define custom MIME types Oct 11, 2022 · It uses a FileReader object to read the content of the file and then checks the first few bytes of the file to determine its actual MIME type. types file and adding its contents to your map. Media Types are controlled by a standards body, The Internet Assigned Numbers Authority (IANA). types file (though a search shows that CUPS for OS X uses such a file, with an enhanced but mostly backward compatible syntax). Oct 19, 2015 · What if the user upload a executable file with . mimetypes. awt. probeContentType(Path) to check the contents of that file. getEexternalContext(). Sep 3, 2018 · In this tutorial, I am showing how to get mime type of a file in java using Java 7 Files and URLConnection class. An alternative is to get the tika-app JAR, which contains tika-core , tika-parsers and all of the dependencies (they are a lot: poi, poi-ooxml, xmlbeans, commons-compress, just to name a few). I am not allowed to use the file extension from the filename to validate the extension. getFileExtensionFromUrl(url); so in fullcode will be like this. See full list on baeldung. getContentType(); This will return a MIME type string. guess_type(url, strict=True). stream(fileName. I need a more assertive solution Jan 3, 2011 · If you are already using Spring this works for csv and excel: import org. Aug 14, 2014 · How can I check whether the file version is . There are only common file types unfortunately. This interface s Apr 27, 2011 · First you have to define an endpoint to call it with the url you want to check: @GET. This library follows its algorithm to the letter. getSingleton(). probeContentType(path) URLConnection mime detection from file name and content type guessing ; JDK 6 JAF API javax. Is this a correct solution or what do you suggest? UPDATE: I've found the mime-util project and it seems very good and up-to-date! (maybe better then Java Mime Magic Library?) Apr 25, 2015 · A MIME type of a file is not part of the file itself. Overview In this tutorial, we’ll take a look at various strategies for getting MIME types of a file. * Get a file mime type based on its filename. You cannot read out the encoding from a text file, but you can set the encoding explicitly when writing files, to make sure the right encoding is set. URL can be a string or a path-like object. getDetector() and/or Oct 11, 2022 · the file content does not contain the file name, but you can encode both the file name and it's content into a string, e. createImageInputStream(is Dec 1, 2021 · FileNameMap interface is a part of the java. When the Web Server receives a request from a client, it uses the MIME type Feb 14, 2017 · 1. " Convert the array into a stream. * Originally copied from HandlerContext. io. – Hot Licks 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. I. The first few bytes of the file's content. types format. public static String getMimeType(String url) {. The p7s extension is defined by the SMIME standard as the file extension used for PKCS-7 cryptographic signatures in RFC 2315. In this short article, we would like to show how in Spring Boot 2 get MIME Type when we know file extension. I suggest checking for a file header/magic number instead. The mapping is stored in an internal object when the mime library is loaded. When requests are made to search for MIME types in the MimetypesFileTypeMap, it searches MIME types files in the following Feb 4, 2015 · If you don't get tika-parsers you won't get any exceptions, you will simply not get the MIME type accurately, so it is REALLY important to include it. FileInputStream; import java. Files java. For example, the MIME types file maps the extensions . IOException; public class ContentTypeResolver { private FileTypeMap fileTypeMap; public ContentTypeResolver() { fileTypeMap = new ConfigurableMimeFileTypeMap(); } public String getContentType(String fileName Aug 6, 2019 · 3. 1. getColumnIndexOrThrow (PROJECTION [0])) IF NOT then try to check when you added or get in list for every item Jul 21, 2015 · If you like, you could just return the extToMimes[ext], which will give undefined if it doesn't exist. Web. file. type property. FileTypeMap; import java. zip|c2VjcmV0IGNvbnRlbnQgOkQ=", then when decoding, split the string on |, then write a file using the first part as name, the second as content after base64 decoding it. createObjectURL(this. activation. split("\\. getContentType (String) We can use the file's name and pass it to the getContentType method of MimetypesFileTypeMap class came with Java 6 in order to get the file type. using MimeTypes; Getting the mime type to an extension. var mime = $('input[type="file"]'). To get the correct file extension you could search the file name string for the last dot and then split it at this position. getOriginalFilename())); 2. Paths Otherwise if the Android Version is below O or the method fails it returns the type using ContentResolver and MimeTypeMap Apr 25, 2015 · Originally, Tika only supported detection by Mime Magic or by file extension (glob), as this is all most mime detection before Tika did. Then the compressed file is downloaded and decompressed to perform various operations on its contained files. I have a Base64 file into one part of my MimeMessage . html and . This is the same organization that manages the root name Jan 10, 2012 · usage (it return object) var data = mimeDb['image/x-icon'] console. View almost all common mime-types here. Notice that even if an image is renamed, its true MIME type can be determined. Jun 13, 2019 · let blob = new Blob(byteArrays); return blob; } Create URL from blob by URL. getContentResolver(); String mimeType = contentResolver. The type of the document that i'm trying to get its mime type, is : java. Using Java 7 Files. kl xf hv zl wr ko bi cx ca mv