Modify XML File In Java Example – (DOM Parser)

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import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
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.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class JavaModityXMLFileExample {
	public static void main(String argv[]) {

		try {
			String filepath = "c:\\file.xml";
			DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
			Document doc = docBuilder.parse(filepath);

			// Get the root element
			Node company = doc.getFirstChild();

			// Get the staff element by tag name directly
			Node staff = doc.getElementsByTagName("staff").item(0);

			// update staff attribute
			NamedNodeMap attr = staff.getAttributes();
			Node nodeAttr = attr.getNamedItem("id");
			nodeAttr.setTextContent("2");

			// append a new node to staff
			Element age = doc.createElement("age");
			age.appendChild(doc.createTextNode("30"));
			staff.appendChild(age);

			// loop the staff child node
			NodeList list = staff.getChildNodes();

			for (int i = 0; i < list.getLength(); i++) {

				Node node = list.item(i);

				// get the salary element, and update the value
				if ("salary".equals(node.getNodeName())) {
					node.setTextContent("2000000");
				}

				// remove firstname
				if ("firstname".equals(node.getNodeName())) {
					staff.removeChild(node);
				}

			}

			// write the content into xml file
			TransformerFactory transformerFactory = TransformerFactory.newInstance();
			Transformer transformer = transformerFactory.newTransformer();
			DOMSource source = new DOMSource(doc);
			StreamResult result = new StreamResult(new File(filepath));
			transformer.transform(source, result);

			System.out.println("Done");

		} catch (ParserConfigurationException pce) {
			pce.printStackTrace();
		} catch (TransformerException tfe) {
			tfe.printStackTrace();
		} catch (IOException ioe) {
			ioe.printStackTrace();
		} catch (SAXException sae) {
			sae.printStackTrace();
		}
	}
}

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