Determining the Format of an Image in a File : ImageReader « 2D Graphics GUI « Java

Determining the Format of an Image in a File


import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;

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

    InputStream is = new FileInputStream(file);
  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);

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


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