Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class Main {
    public static void main(String[] argv) throws Exception {
        File file = new File("image.gif");
        System.out.println(getFormatName(file));

        InputStream is = new FileInputStream(file);
        is.close();
        System.out.println(getFormatName(is));
    }

    private static String getFormatName(Object o) {
        try {
            ImageInputStream iis = ImageIO.createImageInputStream(o);
            Iterator iter = ImageIO.getImageReaders(iis);
            if (!iter.hasNext()) {
                return null;
            }
            ImageReader reader = (ImageReader) iter.next();
            iis.close();

            return reader.getFormatName();
        } catch (IOException e) {
        }
        return null;
    }
}