How can we generate an XML file based on an XML template in Java?

In Java, you can use either DOM (Document Object Model) or JAXB (Java Architecture for XML Binding) to generate XML files.

1. Using the DOM:

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;

public class GenerateXML {

    public static void main(String[] args) {
        try {
            DocumentBuilderFactory documentFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentFactory.newDocumentBuilder();
            Document document = documentBuilder.newDocument();

            Element rootElement = document.createElement("root");
            document.appendChild(rootElement);

            Element childElement = document.createElement("child");
            childElement.appendChild(document.createTextNode("Hello World"));
            rootElement.appendChild(childElement);

            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(document);
            StreamResult result = new StreamResult(new File("output.xml"));

            transformer.transform(source, result);

            System.out.println("XML file generated successfully!");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

1. Utilizing JAXB:

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class GenerateXML {

    public static void main(String[] args) {
        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(YourClass.class);
            Marshaller marshaller = jaxbContext.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

            YourClass object = new YourClass(); // create an object of your class

            marshaller.marshal(object, new File("output.xml"));

            System.out.println("XML file generated successfully!");

        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }
}

The code examples above demonstrate generating XML files using DOM and JAXB respectively. You can choose either method based on your requirements.