Detect image type : ImageIO « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. ImageIO

import java.io.IOException;
import java.net.URL;
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[] args) throws IOException {
    URL[] urls = { new URL("http://yourserver/small.png") };
    for (URL url : urls) {
      ImageInputStream iis = ImageIO.createImageInputStream(url.openStream());
      Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);

      System.out.println("url= " + url.getPath());
      while (readers.hasNext()) {
        ImageReader read = readers.next();
        System.out.println("format name = " + read.getFormatName());
      }
      System.out.println();
    }
  }
}