CODEWITHSUNDEEP
javaunixfilecontent-type
Shervin Asgari
Shervin Asgari

Reputation: 24509

Is there a java library equivalent to file command in unix

Is there any java library that is similar to unix's command file?

ie: 

$ file somepicture.png
somepicture.png PNG image, 805 x 292, 8-bit/color RGB, non-interlaced

The file command is such a nice tool. I need something that can tell me if the file is really what I want it to be. (ie a picture, document etc)

I know I can run the command file, but I am looking for a java library, not running the actual unix command.

Upvotes: 22

Views: 8123

Answers (7)

Markus Duft
Markus Duft

Reputation: 211

Was looking for the same thing and found this: https://github.com/j256/simplemagic - it seems to be a clone of 'file', it even uses a copy of files built-in magic file.

Upvotes: 0

Alan
Alan

Reputation: 2877

Since Java 1.7 you can use Files.probeContentType() to probe a file. Out of box it uses the mechanism on the platform to guess the content type, or you can plugin your own detector if you want.

Upvotes: 12

Hasturkun
Hasturkun

Reputation: 36412

A quick google search (for the admittedly non-obvious) "java magic file detection" brings up a fairly nice looking article, "Get the Mime Type from a File" which suggests you use one of the following:

Upvotes: 19

finnw
finnw

Reputation: 48639

The closest thing in the JDK is URLConnection.guessContentTypeFromStream

Upvotes: 1

openCage
openCage

Reputation: 2775

Have a look at mime-utils. It works with content and/or with extensions.

Upvotes: 1

Laurent
Laurent

Reputation: 14401

I am not sure it is exactly what you are looking for, but the following link can maybe help you :

http://www.rgagnon.com/javadetails/java-0487.html

Upvotes: 2

sfussenegger
sfussenegger

Reputation: 36105

You could look at jmimemagic (tutorial). We've been using it for a while to validate uploaded images. No problems so far.

Upvotes: 3

Related Questions