Java HTML / XML How to - Create DOM element tree

• Back to DOM  ↑

Question

We would like to know how to create DOM element tree.

Answer

/*from   ww  w.j a  v  a 2  s  .c  o m*/
import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilderFactory;
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.xml.sax.InputSource;

public class Main {
  public static String getXMLData() {
    return "<a></a>";
  }

  public static void main(String[] argv) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    Document doc = factory.newDocumentBuilder().parse(
        new InputSource(new StringReader(getXMLData())));

    edit(doc);

    System.out.println(documentToString(doc));

  }
  public static void edit(Document doc) {


    Element root = doc.createElementNS(null, "person"); // Create Root Element
    Element item = doc.createElementNS(null, "name"); // Create element
    item.appendChild(doc.createTextNode("Jeff"));
    root.appendChild(item); // Attach element to Root element
    item = doc.createElementNS(null, "age"); // Create another Element
    item.appendChild(doc.createTextNode("28"));
    root.appendChild(item); // Attach Element to previous element down tree
    item = doc.createElementNS(null, "height");
    item.appendChild(doc.createTextNode("1.80"));
    root.appendChild(item); // Attach another Element - grandaugther
    doc.appendChild(root); // Add Root to Document
  }


  public static String documentToString(Document document) {
    try {
      TransformerFactory tf = TransformerFactory.newInstance();
      Transformer trans = tf.newTransformer();
      StringWriter sw = new StringWriter();
      trans.transform(new DOMSource(document), new StreamResult(sw));
      return sw.toString();
    } catch (TransformerException tEx) {
      tEx.printStackTrace();
    }
    return null;
  }
}

The code above generates the following result.

• Back to DOM  ↑