How do I know if a File type is PDF?

Question

• This answer How can I determine if a file is a PDF file? recommends to download another library, but my requirement is that I just need to check if a file is directory is of type PDF or not

• Using complete library for this use looks like overkill

• Are there any ways to know that a Java File is of type PDF?

Answer 1

Well, according to wikipedia PDF files start with magic numbers: "%PDF" (hex 25 50 44 46) so maybe you should check the InputStream from the file and check that.