Java XML DOM Parser Creating XML Example

DOM Parser classes

DocumentBuilder –> This class defines the API to obtain DOM Document instances from an XML document.

DocumentBuilderFactory –> Defines a factory API that enables applications to obtain a parser that produces DOM object trees from XML documents.

Transformer –> An instance of this abstract class can transform a source tree into a result tree.

TransformerFactory –> A TransformerFactory instance can be used to create Transformer and Template objects.

DOM Parser Example (Creating xml file)

package mycollectiontest;

import java.io.File;
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.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class XMLParser {

   public static void main(String[] args) {
      try {

         // Creating document builder
         DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
         DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

         // Creating Root element
         Document doc = docBuilder.newDocument();
         Element rootElement = doc.createElement("Order");
         doc.appendChild(rootElement);

         // Creating Order number
         Element orderNumber = doc.createElement("Ordernumber");
         rootElement.appendChild(orderNumber);

         // Creating attribute to Order number element
         Attr attr = doc.createAttribute("Number");
         attr.setValue("9988");
         orderNumber.setAttributeNode(attr);

         // Creating Order Line elements
         Element orderdItem = doc.createElement("OrderedItem1");
         orderdItem.appendChild(doc.createTextNode("Pepsi"));
         orderNumber.appendChild(orderdItem);
         // orderlineTax elements
         Element orderlinePrice = doc.createElement("OrderitemPrice");
         orderlinePrice.appendChild(doc.createTextNode("10"));
         orderNumber.appendChild(orderlinePrice);
         // orderlineTax elements
         Element orderlineTax = doc.createElement("OrderitemTax");
         orderlineTax.appendChild(doc.createTextNode("10"));
         orderNumber.appendChild(orderlineTax);

         // Order line Discount
         Element orderDiscount = doc.createElement("OrderDiscount");
         orderDiscount.appendChild(doc.createTextNode("20"));
         orderNumber.appendChild(orderDiscount);

         // Create xmlfile with above attributes
         TransformerFactory transformerFactory = TransformerFactory.newInstance();
         Transformer transformer = transformerFactory.newTransformer();
         DOMSource source = new DOMSource(doc);
         StreamResult resultXML = new StreamResult(new File("Order.xml"));
         transformer.transform(source, resultXML);
         System.out.println("Order.xml has been created");

      } catch (ParserConfigurationException pce) {
         pce.printStackTrace();
      } catch (TransformerException tfe) {
         tfe.printStackTrace();
      }
   }

}

Output

<?xmlversion="1.0"encoding="UTF-8"standalone="no"?>
<Order>
 <Ordernumber Number="9988">
  <OrderedItem1>Pepsi</OrderedItem1>
  <OrderitemPrice>10</OrderitemPrice>
  <OrderitemTax>10</OrderitemTax>
  <OrderDiscount>20</OrderDiscount>
 </Ordernumber>
</Order>

Reference

docs.oracle.com