Java tutorial
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(); } } }