Test if a file is an image file

I am using some file IO and want to know if there is a method to check if a file is an image?

This works pretty well for me. Hope I could help

import javax.activation.MimetypesFileTypeMap;
import java.io.File;
class Untitled {
    public static void main(String[] args) {
        String filepath = "/the/file/path/image.jpg";
        File f = new File(filepath);
        String mimetype= new MimetypesFileTypeMap().getContentType(f);
        String type = mimetype.split("/")[0];
        if(type.equals("image"))
            System.out.println("It's an image");
        else 
            System.out.println("It's NOT an image");
    }
}

if( ImageIO.read(*here your input stream*) == null)
    *IS NOT IMAGE*    

And also there is an answer: How to check a uploaded file whether it is a image or other file?

In Java 7, there is the java.nio.file.Files.probeContentType() method. On Windows, this uses the file extension and the registry (it does not probe the file content). You can then check the second part of the MIME type and check whether it is in the form <X>/image.

You may try something like this:

String pathname="abc\xyz.png"
File file=new File(pathname);


String mimetype = Files.probeContentType(file.toPath());
//mimetype should be something like "image/png"

if (mimetype != null && mimetype.split("/")[0].equals("image")) {
    System.out.println("it is an image");
}

You may try something like this:

   import javax.activation.MimetypesFileTypeMap;

   File myFile;

   String mimeType = new MimetypesFileTypeMap().getContentType( myFile ));
   // mimeType should now be something like "image/png"

   if(mimeType.substring(0,5).equalsIgnoreCase("image")){
         // its an image
   }

this should work, although it doesn't seem to be the most elegant version.