How to know whether file is document file or not and page count

Question

How can i know whether the file is document file
Eg: File file = new File("test.text"); 
        File file = new File("test.doc"); 
        File file = new File("test.pdf");   etc should return true
File file = new File("test.exe"); 
       File file = new File("test.dat");  etc should return false
and if it is true i should get the page count for example if pdf or doc file is containinf 100 pages
i should get the value 100 is there any way to acheive this in java pls give some idea or example code
Regards

Answer 1

To get the number of pages you would need to write or find an existing Java API that can parse the proprietary formats of each type. And some formats do not really have pages. For instance, the number of pages of a .txt (often opened by Notepad by default) file would depend on your page length which is not generally stored in the file it is set by the tool you use to read the file.