Every MIME type, listed in one convenient table. Suffixes applicable, Media type and subtype(s).3dm, x-world/x-3dmf.3dmf, x-world/x-3dmf. MimeType – an actual MIME type holder – and tion. MimetypesFileTypeMap – class whose instance can resolve MIME type as String for a file. setDataHandler(new DataHandler(new ByteArrayDataSource(s, mimetype))); } catch At this point the datasource is actually a {@link ByteArrayDataSource}.
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I tried several ways to do it, including the first ones said by Joshua Fox. It doesn’t work for csv. Whoever down-voted the answer, please add a comment so I and others may learn to post better answers.
I’m running on OS X It seemed that on windows Files. You only need this function public static String getContentType byte[] data, String name It probes the first bytes of the content and returns the content types based on that content and not by file extension. A major limitation with this is that the file must exist on the file system. Worked for the simple, popular, and few file types I needed: It has some problems detecting XLSX if there’s no extension on filename Determine file type from file extension Since 1.
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ByteArrayDataSource (Java(TM) EE 7 Specification APIs)
Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. With Apache Tika you need only three lines of code:.
Create file named ‘mime. Email Required, but never shown. It increased the size of my jar by 54MB!!! You can do it with just one line: FileTypeDetectoryou would drop in the preferred implementing library’s jar file into your classpath and that would be it.
That is why probeContentType method throws IOException, in case an implementation of this API uses Path provided to it to actually try to open the file associated with it. Look the complete test code Java Apache Tika offers in tika-core a mime type detection based based on magic markers in the stream prefix. Lu55 docs say that still uses the document content.
I didn’t vote you down butgetFileNameMap doesn’t work for many basic file typesfor example ‘bmp’. Sign up using Facebook. In the real world, the one where you need TL,DR section, you should find the library with most stars next to it’s name and use it. This will work, but is IMO a bad practice as it ties your code to a specific OS and requires the external utility to be present at the system running it.
Yes, this works well.
Java Examples for javax.mail.util.ByteArrayDataSource
With SimpleMagic you can do something like: Joshua Fox 7, 9 50 See the apidocs for more information. This is useless if the file has a missing or wrong extension. However, as suggested by the comment above, the built-in table of mime-types is quite limited, not including, for example, MSWord and PDF. FileTypeDetectorwhich defines a standard API for determining a file type in implementation specific way. I tested with ‘webm’ and it returned null.
To chip in with my 5 cents: Most interesting classes are javax. In its vanilla implementation this does not do much i. Cassio Seffrin 5 9.
Frakcool 7, 5 25 Sign up using Email and Password. A good overview on available libraries is given at rgagnon. More hints are provided at https: Ovidiu Buligan 1, 18 Your awesome library handled it properly. Then it will be a really secure way to check for file validations. AhmadReza 6 For the record, I’m going to respectfully disagree.
Java Code Examples of rayDataSource
Again, vanilla implementation of this the one that comes with JDK leaves a lot to be desired. Jul 29 ’15 at For exmaple if name is test. So, if you want to generalize, you’ll need to go beyond the built-in libraries, using, e. I was just wondering how most people fetch a mime type from a file in Java? It’s successfully working for me. It is, however, super simple to add any content type you may need:. To fetch mime type for a file, you would simply use Files and do this in your code: In Java 7 you can now just use Files.
Let context and the programmer make that decision.