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FileNameMap from the java.net package is a simple interface which provides a mechanism to map between a file name and a MIME type string. It's not actually something that I've come across before, even though it's existed since version 1.1 of the JDK. However, with code like the following, you can get the MIME type using the default JDK mappings that are specified in the JAVA_HOME/lib/content-types.properties file.

      FileNameMap fileNameMap = URLConnection.getFileNameMap();
      String mimeType = fileNameMap.getContentTypeFor(someFileName);

Thanks to Weiqi Gao for sending me over a patch to Pebble that made use of this technique. Useful stuff!