Reading Image Metadata from an image file

gistfile1.java

package de.feki.layout.timeinserter;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadata;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Node;

public class Test {

	public static void main(String[] args) throws IOException {
		File file = new File("testpic/source_0001.jpg");
		ImageReader reader = ImageIO.getImageReadersByFormatName("jpeg").next();
		reader.setInput(ImageIO.createImageInputStream(file));
		IIOMetadata metadata = reader.getImageMetadata(0);

		for (String object : metadata.getMetadataFormatNames()) {
			if (object != null) {
				System.out.println(object);

				Node node = metadata.getAsTree(object);
				System.out.println(xmlToString(node));
			}
		}
	}

	public static String xmlToString(Node node) {
		try {
			Source source = new DOMSource(node);
			StringWriter stringWriter = new StringWriter();
			Result result = new StreamResult(stringWriter);
			TransformerFactory factory = TransformerFactory.newInstance();
			Transformer transformer = factory.newTransformer();
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			transformer.transform(source, result);
			return stringWriter.getBuffer().toString();
		} catch (TransformerConfigurationException e) {
			e.printStackTrace();
		} catch (TransformerException e) {
			e.printStackTrace();
		}
		return null;
	}

}