How to Generate XML in Java ?

See the following sample class:

GenerateXML.java

package opensourzesupport.xml

import java.io.PrintStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
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;

/**
 *
 * @author Prasobh.K
 */
public class GenerateXML {

    public static void main(String[] args) {
        String documentToBeCreated = "myXMLDocument.xml";
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();


            // creating a new document
            Document myXMLDocument = builder.newDocument();

            //creating a root element
            Element rootElement = myXMLDocument.createElement("root");
            myXMLDocument.appendChild(rootElement);

            for (int i = 1; i <4; i++) {

                //creating a child root element
                Element childRootElement = myXMLDocument.createElement("childroot" + i);
                rootElement.appendChild(childRootElement);
                for (int j = 1; j < 10; j++) {
                    Element child = myXMLDocument.createElement("innerelement");
                    child.setTextContent("" + j);
                    childRootElement.appendChild(child);
                }

            }
            // The XML document we created above is still in memory
            // so we have to output it to a real file.
            // In order to do it we first have to create
            // an instance of DOMSource
            DOMSource source = new DOMSource(myXMLDocument);

            // PrintStream will be responsible for writing
            // the text data to the file
            PrintStream ps = new PrintStream(documentToBeCreated);
            StreamResult result = new StreamResult(ps);

            // Transformer instance, which we use to output the XML
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();

            // The actual output to a file goes here
            transformer.transform(source, result);
            System.out.println("Sucessfully created " + documentToBeCreated);
        } catch (Exception e) {
            System.out.println("Failed tro create xml" + e);
        }

    }
}


Output :

myXMLDocument.xml

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>

- <root>

- <childroot1>

  <innerelement>1</innerelement>

  <innerelement>2</innerelement>

  <innerelement>3</innerelement>

  <innerelement>4</innerelement>

  <innerelement>5</innerelement>

  <innerelement>6</innerelement>

  <innerelement>7</innerelement>

  <innerelement>8</innerelement>

  <innerelement>9</innerelement>

  </childroot1>

- <childroot2>

  <innerelement>1</innerelement>

  <innerelement>2</innerelement>

  <innerelement>3</innerelement>

  <innerelement>4</innerelement>

  <innerelement>5</innerelement>

  <innerelement>6</innerelement>

  <innerelement>7</innerelement>

  <innerelement>8</innerelement>

  <innerelement>9</innerelement>

  </childroot2>

- <childroot3>

  <innerelement>1</innerelement>

  <innerelement>2</innerelement>

  <innerelement>3</innerelement>

  <innerelement>4</innerelement>

  <innerelement>5</innerelement>

  <innerelement>6</innerelement>

  <innerelement>7</innerelement>

  <innerelement>8</innerelement>

  <innerelement>9</innerelement>

  </childroot3>

  </root>