identify the file extension using java

Question

i have different format files in DB. i want to copy to my local machine.

how can i identify the file format (doc, xls, etc...)

Regards, krishna

Thanks, for providing suggestions... based on your suggestions i had written the code & i am completed...

please look into my blog.. i posted the code over here...

http://muralie39.wordpress.com/java-program-to-copy-files-from-oracle-to-localhost/

Thank you guys..

Thanks, krishna

Answer 1

If your files are named according to convention, you can just parse the filename:

String filename = "yourFileName";
int dotPosition = filename.lastIndexOf(".");
String extension = "";
if (dotPosition != -1) {
    extension = filename.substring(dotPosition);
}
System.out.println("The file is of type: " + extension);

That's the simplest approach, assuming your files are named using some kind of standard naming convention. The extensions could be proprietary to your system, even, as long as they follow a convention this will work.

If you need to actually scan the file to get the format information, you will need to do some more investigation into document formats.