How to get file extension from content type?

Question

I\'m using Apache Tika, and I have files (without extension) of particular content type that need to be renamed to have extension that reflect the content type.

Any

Answer 1

If you are using Apache tike version 1.24.1 then try following code

// File Input Stream  is "inputStream"
try 
{
    TikaConfig tikaConfig= new TikaConfig();                    
    Detector detector = tikaConfig.getDetector();

    TikaInputStream stream = TikaInputStream.get(item.getInputStream());

    Metadata metadata = new Metadata();
    metadata.add(Metadata.RESOURCE_NAME_KEY, item.getName());
    MediaType mediaType = detector.detect(stream, metadata);
     
    MimeType mimeType = tikaConfig.getMimeRepository().forName(mediaType.toString());
    String extension =  mimeType.getExtension().split("\\.")[1];
    System.out.println("File Extentions is : "+ extension);
                
} 
catch (TikaException | IOException e1) 
{
    e1.printStackTrace();
}