javax.xml.transform.stax

---

1. Convert XML to HTML using STAX

import javax.xml.stream.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;
import org.xml.sax.helpers.AttributesImpl;

public class XmlToHtml {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);
        StAXSource source = new StAXSource(xmlReader);

        Transformer transformer = TransformerFactory.newInstance().newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "html");

        XMLStreamWriter htmlWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);
        StAXResult result = new StAXResult(htmlWriter);

        transformer.transform(source, result);
    }
}

2. Transform XML to JSON using STAX

import javax.xml.stream.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;
import org.xml.sax.helpers.AttributesImpl;

public class XmlToJson {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);
        StAXSource source = new StAXSource(xmlReader);

        Transformer transformer = TransformerFactory.newInstance().newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "json");

        XMLStreamWriter jsonWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);
        StAXResult result = new StAXResult(jsonWriter);

        transformer.transform(source, result);
    }
}

3. Parse XML using STAX and SAX

import javax.xml.stream.*;
import org.xml.sax.helpers.*;

public class ParseXmlWithStaxAndSax {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);

        DefaultHandler saxHandler = new DefaultHandler() {
            @Override
            public void startElement(String uri, String localName, String qName, Attributes attributes) {
                System.out.println("Start element: " + qName);
            }

            @Override
            public void endElement(String uri, String localName, String qName) {
                System.out.println("End element: " + qName);
            }

            @Override
            public void characters(char[] ch, int start, int length) {
                System.out.println("Characters: " + new String(ch, start, length));
            }
        };

        XMLReader saxReader = new SAXParserFactory().newSAXParser().getXMLReader();
        saxReader.setContentHandler(saxHandler);
        saxReader.parse(new StAXSource(xmlReader));
    }
}

4. Create XML using STAX and SAX

import javax.xml.stream.*;
import org.xml.sax.helpers.*;

public class CreateXmlWithStaxAndSax {

    public static void main(String[] args) throws Exception {
        XMLStreamWriter xmlWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);

        DefaultHandler saxHandler = new DefaultHandler() {
            @Override
            public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
                xmlWriter.writeStartElement(qName);
            }

            @Override
            public void endElement(String uri, String localName, String qName) throws SAXException {
                xmlWriter.writeEndElement();
            }

            @Override
            public void characters(char[] ch, int start, int length) throws SAXException {
                xmlWriter.writeCharacters(ch, start, length);
            }
        };

        XMLReader saxReader = new SAXParserFactory().newSAXParser().getXMLReader();
        saxReader.setContentHandler(saxHandler);
        saxReader.parse(new InputSource(System.in));

        xmlWriter.flush();
    }
}

5. Parse XML with STAX and XPath

import javax.xml.stream.*;
import javax.xml.xpath.*;

public class ParseXmlWithStaxAndXPath {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);

        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xPath = xPathFactory.newXPath();

        while (xmlReader.hasNext()) {
            int eventType = xmlReader.next();

            if (eventType == XMLStreamConstants.START_ELEMENT) {
                System.out.println(xPath.evaluate("/", xmlReader));
            }
        }
    }
}

6. Create XML with STAX and XSLT

import javax.xml.stream.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;

public class CreateXmlWithStaxAndXslt {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);
        StAXSource source = new StAXSource(xmlReader);

        Transformer transformer = TransformerFactory.newInstance().newTransformer(new StreamSource("my-stylesheet.xslt"));
        XMLStreamWriter xmlWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);
        StAXResult result = new StAXResult(xmlWriter);

        transformer.transform(source, result);
    }
}

7. Convert XML to PDF using STAX and FOP

import javax.xml.stream.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;
import org.apache.fop.apps.*;

public class ConvertXmlToPdfWithStaxAndFop {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);
        StAXSource source = new StAXSource(xmlReader);

        FopFactory fopFactory = FopFactory.newInstance();
        FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, System.out);

        Transformer transformer = TransformerFactory.newInstance().newTransformer();
        XMLStreamWriter xmlWriter = foUserAgent.getXMLStreamWriter();
        StAXResult result = new StAXResult(xmlWriter);

        transformer.transform(source, result);

        fop.render();
    }
}

8. Process XML Events using STAX

import javax.xml.stream.*;

public class ProcessXmlEvents {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);

        while (xmlReader.hasNext()) {
            int eventType = xmlReader.next();

            switch (eventType) {
                case XMLStreamConstants.START_ELEMENT:
                    System.out.println("Start element: " + xmlReader.getLocalName());
                    break;
                case XMLStreamConstants.ATTRIBUTE:
                    System.out.println("Attribute: " + xmlReader.getLocalName() + " = " + xmlReader.getValue());
                    break;
                case XMLStreamConstants.CHARACTERS:
                    System.out.println("Characters: " + xmlReader.getText());
                    break;
                case XMLStreamConstants.END_ELEMENT:
                    System.out.println("End element: " + xmlReader.getLocalName());
                    break;
            }
        }
    }
}

9. Create XML Namespaces using STAX

import javax.xml.stream.*;

public class CreateXmlNamespaces {

    public static void main(String[] args) throws Exception {
        XMLStreamWriter xmlWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);

        xmlWriter.writeStartDocument();
        xmlWriter.setDefaultNamespace("http://www.example.com/namespace");

        xmlWriter.writeStartElement("root");
        xmlWriter.writeAttribute("xmlns", "http://www.example.com/namespace");

        xmlWriter.writeStartElement("child");
        xmlWriter.writeNamespace("ns", "http://www.example.com/namespace2");
        xmlWriter.writeAttribute("ns:name", "value");

        xmlWriter.writeEndElement(); // end child
        xmlWriter.writeEndElement(); // end root

        xmlWriter.writeEndDocument();
        xmlWriter.flush();
    }
}

10. Validate XML using STAX

import javax.xml.stream.*;

public class ValidateXml {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);

        while (xmlReader.hasNext()) {
            int eventType = xmlReader.next();

            if (eventType == XMLStreamConstants.START_DOCUMENT) {
                XMLStreamReader schemaReader = XMLInputFactory.newInstance().createXMLStreamReader(new FileInputStream("my-schema.xsd"));

                SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
                Schema schema = schemaFactory.newSchema(schemaReader);

                Validator validator = schema.newValidator();
                validator.validate(xmlReader);
            }
        }
    }
}

11. Parse XML Fragments using STAX

import javax.xml.stream.*;

public class ParseXmlFragments {

    public static void main(String[] args) throws Exception {
        XMLInputFactory inputFactory = XMLInputFactory.newInstance();
        inputFactory.setProperty(XMLInputFactory.IS_COALESCING, true);

        XMLStreamReader xmlReader = inputFactory.createXMLStreamReader(System.in);

        while (xmlReader.hasNext()) {
            int eventType = xmlReader.next();

            if (eventType == XMLStreamConstants.START_ELEMENT) {
                XMLStreamReader fragmentReader = inputFactory.createFragmentReader(xmlReader);

                while (fragmentReader.hasNext()) {
                    int fragmentEventType = fragmentReader.next();

                    if (fragmentEventType == XMLStreamConstants.START_ELEMENT) {
                        System.out.println("Fragment start element: " + fragmentReader.getLocalName());
                    } else if (fragmentEventType == XMLStreamConstants.CHARACTERS) {
                        System.out.println("Fragment characters: " + fragmentReader.getText());
                    } else if (fragmentEventType == XMLStreamConstants.END_ELEMENT) {
                        System.out.println("Fragment end element: " + fragmentReader.getLocalName());
                    }
                }
            }
        }
    }
}

12. Create XML Fragments using STAX

import javax.xml.stream.*;

public class CreateXmlFragments {

    public static void main(String[] args) throws Exception {
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
        XMLStreamWriter xmlWriter = outputFactory.createXMLStreamWriter(System.out);

        xmlWriter.writeStartDocument();
        xmlWriter.writeStartElement("root");

        XMLStreamWriter fragmentWriter = outputFactory.createFragmentWriter(xmlWriter);

        fragmentWriter.writeStartElement("fragment");
        fragmentWriter.writeCharacters("This is a fragment");
        fragmentWriter.writeEndElement();

        xmlWriter.writeEndElement(); // end root
        xmlWriter.writeEndDocument();

        xmlWriter.flush();
    }
}

13. Use STAX with DOM

import javax.xml.stream.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;

public class UseStaxWithDom {

    public static void main(String[] args) throws Exception {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();

        Document document = documentBuilder.parse(System.in);

        XMLStreamWriter xmlWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);

        xmlWriter.writeStartDocument();
        xmlWriter.writeCharacters(document.getDocumentElement().getTextContent());
        xmlWriter.writeEndDocument();

        xmlWriter.flush();
    }
}

14. Use STAX with SAX

import javax.xml.stream.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

public class UseStaxWithSax {

    public static void main(String[] args) throws Exception {
        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(System.in);

        DefaultHandler saxHandler = new DefaultHandler() {
            @Override
            public void startElement(String uri, String localName, String qName, Attributes attributes) {
                System.out.println("Start element: " + qName);
            }

            @Override
            public void endElement(String uri, String localName, String qName) {
                System.out.println("End element: " + qName);
            }

            @Override
            public void characters(char[] ch, int start, int length) {
                System.out.println("Characters: " + new String(ch, start, length));
            }
        };

        SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
        SAXParser saxParser = saxParserFactory.newSAXParser();
        XMLReader saxReader = saxParser.getXMLReader();
        saxReader.setContentHandler(saxHandler);

        SAXSource saxSource = new SAXSource(saxReader, new XMLStreamReaderAdapter(xmlReader));
        Transformer transformer = TransformerFactory.newInstance().newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");

        transformer.transform