CODEWITHSUNDEEP
javamime-types
Md. Reazul Karim
Md. Reazul Karim

Reputation: 655

Java get file type from content using mimeutil is not working as expected

In my following code:

MimeUtil.registerMimeDetector("eu.medsea.mimeutil.detector.MagicMimeMimeDetector");
File f = new File ("c:\\temp\\mime\\java.exe");
Collection<?> mimeTypes = MimeUtil.getMimeTypes("c:\\temp\\mime\\java.exe");
MimeType m = mimeTypes.toArray(new MimeType[mimeTypes.size()])[0];
System.out.println(m);

The output is always application/octet-stream no matter what file type is chosen ie csv, xls, exe, etc.

But according to the following site:

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

it should show as like ms-word or ms-excel etc.

How to make this work? All I want is just get the file type from file content(not by using file extension which is not very reliable). 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. All other solutions seem to rely on file extension which seem not to be reliable as mentioned above.

Thanks

Upvotes: 4

Views: 5060

Answers (2)

HGO
HGO

Reputation: 21

Respect the OS, so you might try:

  MimeUtil
        .registerMimeDetector(System.getProperty("os.name").startsWith(
              "Windows") ? "eu.medsea.mimeutil.detector.WindowsRegistryMimeDetector"
              : "eu.medsea.mimeutil.detector.OpendesktopMimeDetector");

Upvotes: 2

Brian Pipa
Brian Pipa

Reputation: 806

Ok, I think I figured this out for myself (and you)... I looked at the author's unit tests, specifically MimeUtilTest.java and lo and behold, he does this in the unit test setup(): MimeUtil.registerMimeDetector("eu.medsea.mimeutil.detector.MagicMimeMimeDetector"); MimeUtil.registerMimeDetector("eu.medsea.mimeutil.detector.ExtensionMimeDetector"); MimeUtil.registerMimeDetector("eu.medsea.mimeutil.detector.OpendesktopMimeDetector");

I, and you too, was only registering the first one, MagicMimeMimeDetector. Once I added in the other two, it all started working correctly.

Upvotes: 3

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