XML Transformations in Java

Java provides very robust API for XML Processing. Transforming XML String to org.w3c.dom.Document and vise versa is very simple. XMLTransformations.java given below is written using JDK6. Method getDocumentAsString transforms org.w3c.dom.Document to plain String.Method getStringAsDocument transforms plain String to org.w3c.dom.Document.

XMLTransformations.java

import java.io.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.*;
import org.xml.sax.InputSource;

/**
 * XMLTransformations Utilities.
 * @author Tejas Purohit
 */
public class XMLTransformations {

 public XMLTransformations() {
 }

 /**
  * Transforms given org.w3c.dom.Document to String.
  * @param node Node to convert to String
  * @return String representation of given org.w3c.dom.Document
  */
 public String getDocumentAsString(Document doc) {

  String result = null;

  try {

   // Getting DOM Source
   DOMSource domSource = new DOMSource(doc);

   // Getting Output Stream to write result
   ByteArrayOutputStream byteOut = new ByteArrayOutputStream();

   // Getting new TransformerFactory
   TransformerFactory transformerfactory = TransformerFactory.newInstance();

   // Getting new Transformer
   Transformer transformer = transformerfactory.newTransformer();

   // Transforms DOMSource to StreamResult
   transformer.transform(domSource, new StreamResult(byteOut));

   result = byteOut.toString(); // Getting String from ByteArrayOutputStream

  } catch (Exception ex) {

   ex.printStackTrace();

  }

  return result;

 }

 /**
  * Builds org.w3c.dom.Document from given String.
  * @param strXML XML as String
  * @return org.w3c.dom.Document builded from String
  */
 public Document getStringAsDocument(String strXML) {

  Document doc = null;

  try {

   // Getting new DocumentBuilderFactory
   DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

   // Setting namespace aware to true
   factory.setNamespaceAware(true);

   // Getting new DocumentBuilder
   DocumentBuilder builder = factory.newDocumentBuilder();

   // Parsing String to Document
   doc = builder.parse(new InputSource(new StringReader(strXML)));

  } catch (Exception ex) {

   ex.printStackTrace();

  }

  return doc;

 }
}