Alternative to Files.probeContentType?

Question

In a web project, users upload their files, but when I receive them on the server, they are being stored as .tmp files rather than their original file extension (this is my

Answer 1

Take a look at the Apache Tika. It can easily determine a mime type:

 Tika tika = new Tika();
 File file = ...
 String mimeType = tika.detect(file);

Here's a minimal required maven dependency:

 <dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-core</artifactId>
    <version>1.12</version>
 </dependency>

Answer 2

This answer suggests using:

InputStream is = new BufferedInputStream(new FileInputStream(file));
mimeType = URLConnection.guessContentTypeFromStream(is);
//...close stream

Answer 3

This also works

String mimeType = URLConnection.guessContentTypeFromName(new File(path).getName());