CODEWITHSUNDEEP
javajava-io
Artem
Artem

Reputation: 2500

How to instantiate java.io.File object without knowing file extension?

I store file names of images in my database(user_id.extension, for example 14.png).

Suppose, I need to retrieve a file and write it to stream. But how can I create the java.io.File object without knowing file extension(images can be jpg, png and so on)? Now in my database there are only images with .png extension and I do this:

File file = new File(pathToAvatarFolder + File.separator + user.getId() + ".png");

Is there an elegant solution for this? Only brute force solution comes to my mind:

List<String> imageExtensions = new ArrayList<>();
imageExtensions.add(".png");
imageExtensions.add(".jpg");
imageExtensions.add(".jpeg");

File file;
for(int i = 0; i < imageExtensions.size(); i++) {
    file = new File(pathToAvatarFolder + File.separator + user.getId() + imageExtensions.get(i));
    if (file.exists()) {
        break;
    }

    file = null;
}

Just to be clear, I need to instance java.io.File object using pathname without extension.

Upvotes: 1

Views: 1102

Answers (1)

Sai Kishore
Sai Kishore

Reputation: 326

import java.nio.*;
import java.nio.file.*;

Files.probeContentType((new File("filename.ext")).toPath());

This returns the type of the files. For png, it will be image/png.

Upvotes: 1

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