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import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
 
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
 
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
 
public class  XMLReadWrite {
 
    public static void main (String []args) {
    	try {
    		File file = new File("exemple.xml");
    		Document document = fileToDocument(file);
			NodeList nodeList = document.getElementsByTagName("interface");
			Node node = nodeList.item(0); // on suppose qu'il y a qu'un seul noeud interface
			node.getAttributes().getNamedItem("longueur").setNodeValue("500");
			node.getAttributes().getNamedItem("largeur").setNodeValue("500");
			documentToFile(document, file);
    	} catch (Exception ex) {
    		ex.printStackTrace();
    	}
   }
 
	/**
         * Transforms a xml file into a DOM XML document.
         * 
         * @param file
         *            The file to parse
         * @return The DOM XML document
         */
	public static Document fileToDocument(File file) throws Exception {
		InputStreamReader converter = new InputStreamReader(new FileInputStream(file), Charset.forName("UTF-8"));
		Source xmlSource = new StreamSource(converter);
		Result xmlResult = new DOMResult();
		Transformer transformer = TransformerFactory.newInstance().newTransformer();
		transformer.transform(xmlSource, xmlResult);
		converter.close();
		return (Document) ((DOMResult) xmlResult).getNode();
	}
 
	/**
         * Transforms a DOM XML document into xml file.
         * 
         * @param document
         *                              The DOM XML document
         * @param file
         *                              The output file
         */
	public static void documentToFile(Document document, File file) throws Exception {
		StreamResult xmlfile = new StreamResult(file);
 
		/* Serialization */
		DOMSource domSource = new DOMSource(document);
		TransformerFactory transformFactory = TransformerFactory.newInstance();
 
		Transformer serializer = transformFactory.newTransformer();
		/* final step */
		serializer.transform(domSource, xmlfile);
	}
 
} | 
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