javax.xml.stream

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1. Parsing XML with StAX (Streaming API for XML)

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;

public class StAXParser {

    public static void main(String[] args) throws XMLStreamException {
        // Create an XMLInputFactory instance
        XMLInputFactory factory = XMLInputFactory.newInstance();

        // Create an XMLEventReader instance from the XML file
        XMLEventReader reader = factory.createXMLEventReader(new FileInputStream("example.xml"));

        // Iterate over the XML events and print them out
        while (reader.hasNext()) {
            XMLEvent event = reader.nextEvent();
            System.out.println(event);
        }
    }
}

2. Writing XML with StAX

import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;

public class StAXWriter {

    public static void main(String[] args) throws XMLStreamException {
        // Create an XMLOutputFactory instance
        XMLOutputFactory factory = XMLOutputFactory.newInstance();

        // Create an XMLEventWriter instance
        XMLEventWriter writer = factory.createXMLEventWriter(new FileOutputStream("example.xml"));

        // Create a root element
        writer.add(factory.createStartElement("", "", "root"));

        // Add a child element
        writer.add(factory.createStartElement("", "", "child"));
        writer.add(factory.createCharacters("Hello world!"));
        writer.add(factory.createEndElement("", "", "child"));

        // End the root element
        writer.add(factory.createEndElement("", "", "root"));

        // Close the writer
        writer.close();
    }
}

3. Transforming XML with StAX

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;

public class StAXTransformer {

    public static void main(String[] args) throws XMLStreamException {
        // Create an XMLInputFactory instance
        XMLInputFactory inputFactory = XMLInputFactory.newInstance();

        // Create an XMLEventReader instance from the XML file
        XMLEventReader reader = inputFactory.createXMLEventReader(new FileInputStream("example.xml"));

        // Create an XMLOutputFactory instance
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();

        // Create an XMLEventWriter instance
        XMLEventWriter writer = outputFactory.createXMLEventWriter(new FileOutputStream("transformed.xml"));

        // Iterate over the XML events and transform them
        while (reader.hasNext()) {
            XMLEvent event = reader.nextEvent();

            // Transform the event if necessary
            if (event.isStartElement()) {
                event = factory.createStartElement("", "", "transformed-" + event.asStartElement().getName().getLocalPart());
            } else if (event.isEndElement()) {
                event = factory.createEndElement("", "", "transformed-" + event.asEndElement().getName().getLocalPart());
            }

            // Add the event to the output
            writer.add(event);
        }

        // Close the reader and writer
        reader.close();
        writer.close();
    }
}

4. Validating XML with StAX

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.XMLEvent;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

public class StAXValidator {

    public static void main(String[] args) throws XMLStreamException {
        // Create an XMLInputFactory instance
        XMLInputFactory factory = XMLInputFactory.newInstance();

        // Set the validating parser property to true
        factory.setXMLStreamReaderProperty(XMLStreamReader.IS_VALIDATING, true);

        // Create an XMLEventReader instance from the XML file
        XMLEventReader reader = factory.createXMLEventReader(new FileInputStream("example.xml"));

        // Get the schema factory
        SchemaFactory schemaFactory = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema");

        // Load the schema
        Schema schema = schemaFactory.newSchema(new File("schema.xsd"));

        // Set the schema on the reader
        reader.setSchema(schema);

        // Iterate over the XML events and validate them
        while (reader.hasNext()) {
            XMLEvent event = reader.nextEvent();

            // Validate the event
            if (event.isStartElement()) {
                schema.validate(event.asStartElement());
            } else if (event.isEndElement()) {
                schema.validate(event.asEndElement());
            }
        }

        // Close the reader
        reader.close();
    }
}

5. Generating XML with JAXB

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

public class JAXBGenerator {

    public static void main(String[] args) throws Exception {
        // Create a JAXBContext instance for the Employee class
        JAXBContext context = JAXBContext.newInstance(Employee.class);

        // Create a Marshaller instance
        Marshaller marshaller = context.createMarshaller();

        // Create an Employee object
        Employee employee = new Employee();
        employee.setId(1);
        employee.setName("John Doe");

        // Marshal the Employee object to an XML file
        marshaller.marshal(employee, new FileOutputStream("employee.xml"));
    }
}

6. Unmarshalling XML with JAXB

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;

public class JAXBUnmarshaller {

    public static void main(String[] args) throws Exception {
        // Create a JAXBContext instance for the Employee class
        JAXBContext context = JAXBContext.newInstance(Employee.class);

        // Create an Unmarshaller instance
        Unmarshaller unmarshaller = context.createUnmarshaller();

        // Unmarshal the XML file into an Employee object
        Employee employee = (Employee) unmarshaller.unmarshal(new FileInputStream("employee.xml"));

        // Print the employee details
        System.out.println(employee.getId());
        System.out.println(employee.getName());
    }
}

7. Parsing XML with JDOM

import org.jdom2.Document