BAEL-2338 (#6150)

* BAEL-2338

* Update Application.java

* merged and updated

* updated pom.xml

* improved and updated

* corrected per request

* removed annotations

* formatting

xml/README.md

@@ -4,3 +4,4 @@
 - [XML Libraries Support in Java](http://www.baeldung.com/java-xml-libraries)
 - [DOM parsing with Xerces](http://www.baeldung.com/java-xerces-dom-parsing)
 - [Write an org.w3.dom.Document to a File](https://www.baeldung.com/java-write-xml-document-file)
+- [Convert XML to HTML](https://www.baeldung.com/)

xml/pom.xml

@@ -30,6 +30,22 @@
             <version>${jdom2.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>javax.xml</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.xml</groupId>
+            <artifactId>jaxp-api</artifactId>
+            <version>1.4.2</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.xml.stream</groupId>
+            <artifactId>stax-api</artifactId>
+            <version>1.0-2</version>
+        </dependency>
+
         <!-- utils -->
         <dependency>
             <groupId>commons-io</groupId>

xml/src/main/java/com/baeldung/xmlhtml/Application.java

@@ -0,0 +1,10 @@
+package com.baeldung.xmlhtml;
+
+import com.baeldung.xmlhtml.helpers.XMLRunner;
+
+public class Application {
+
+    public static void main(String[] args) {
+        XMLRunner.doWork();
+    }
+}

xml/src/main/java/com/baeldung/xmlhtml/Constants.java

@@ -0,0 +1,22 @@
+package com.baeldung.xmlhtml;
+
+public class Constants {
+
+    public static final String XML_FILE_IN = "src/main/resources/xml/in.xml";
+    public static final String JAXB_FILE_OUT = "src/main/resources/xml/jaxb.html";
+    public static final String JAXP_FILE_OUT = "src/main/resources/xml/jaxp.html";
+    public static final String STAX_FILE_OUT = "src/main/resources/xml/stax.html";
+
+    public static final String EXCEPTION_ENCOUNTERED = "Generic exception! Error: ";
+
+    public static final String LINE_BREAK = System.getProperty("line.separator");
+    public static final String WHITE_SPACE = " ";
+
+    public static final String DOCUMENT_START = "Document parsing has begun!";
+    public static final String DOCUMENT_END = "Document parsing has ended!";
+    public static final String ELEMENT_START = "Element parsing has begun!";
+    public static final String ELEMENT_END = "Element parsing has ended!";
+
+    public static final String BREAK = "\n";
+    public static final String TAB = "\t";
+}

xml/src/main/java/com/baeldung/xmlhtml/helpers/XMLRunner.java

@@ -0,0 +1,16 @@
+package com.baeldung.xmlhtml.helpers;
+
+
+import com.baeldung.xmlhtml.helpers.jaxb.JAXBHelper;
+import com.baeldung.xmlhtml.helpers.jaxp.JAXPHelper;
+import com.baeldung.xmlhtml.helpers.stax.STAXHelper;
+
+public class XMLRunner {
+
+    public static void doWork() {
+        JAXBHelper.example();
+        JAXPHelper.saxParser();
+        JAXPHelper.documentBuilder();
+        STAXHelper.write(STAXHelper.read());
+    }
+}

xml/src/main/java/com/baeldung/xmlhtml/helpers/jaxb/JAXBHelper.java

@@ -0,0 +1,77 @@
+package com.baeldung.xmlhtml.helpers.jaxb;
+
+import com.baeldung.xmlhtml.pojo.jaxb.html.ExampleHTML;
+import com.baeldung.xmlhtml.pojo.jaxb.html.elements.Body;
+import com.baeldung.xmlhtml.pojo.jaxb.html.elements.CustomElement;
+import com.baeldung.xmlhtml.pojo.jaxb.html.elements.Meta;
+import com.baeldung.xmlhtml.pojo.jaxb.html.elements.NestedElement;
+import com.baeldung.xmlhtml.pojo.jaxb.xml.XMLExample;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Unmarshaller;
+
+import java.io.File;
+
+import static com.baeldung.xmlhtml.Constants.*;
+
+public class JAXBHelper {
+
+    private static void print(String xmlContent) {
+        System.out.println(xmlContent);
+    }
+
+    private static Unmarshaller getContextUnmarshaller(Class clazz) {
+        Unmarshaller unmarshaller = null;
+        try {
+            JAXBContext context = JAXBContext.newInstance(clazz);
+            unmarshaller = context.createUnmarshaller();
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+        return unmarshaller;
+    }
+
+    private static Marshaller getContextMarshaller(Class clazz) {
+        Marshaller marshaller = null;
+        try {
+            JAXBContext context = JAXBContext.newInstance(clazz);
+            marshaller = context.createMarshaller();
+            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
+            marshaller.setProperty("jaxb.fragment", Boolean.TRUE);
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+        return marshaller;
+    }
+
+    public static void example() {
+        try {
+            XMLExample xml = (XMLExample) JAXBHelper.getContextUnmarshaller(XMLExample.class).unmarshal(new File(XML_FILE_IN));
+            JAXBHelper.print(xml.toString());
+            ExampleHTML html = new ExampleHTML();
+
+            Body body = new Body();
+            CustomElement customElement = new CustomElement();
+            NestedElement nested = new NestedElement();
+            CustomElement child = new CustomElement();
+
+            customElement.setValue("descendantOne: " + xml.getAncestor().getDescendantOne().getValue());
+            child.setValue("descendantThree: " + xml.getAncestor().getDescendantTwo().getDescendantThree().getValue());
+            nested.setCustomElement(child);
+
+            body.setCustomElement(customElement);
+            body.setNestedElement(nested);
+
+            Meta meta = new Meta();
+            meta.setTitle("example");
+            html.getHead().add(meta);
+            html.setBody(body);
+
+            JAXBHelper.getContextMarshaller(ExampleHTML.class).marshal(html, new File(JAXB_FILE_OUT));
+
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+    }
+}

xml/src/main/java/com/baeldung/xmlhtml/helpers/jaxp/CustomHandler.java

@@ -0,0 +1,34 @@
+package com.baeldung.xmlhtml.helpers.jaxp;
+
+import org.xml.sax.ContentHandler;
+import org.xml.sax.Locator;
+
+import static com.baeldung.xmlhtml.Constants.*;
+
+public class CustomHandler implements ContentHandler {
+
+    public void startDocument() {}
+
+    public void startElement(String uri, String localName, String qName, org.xml.sax.Attributes atts) { }
+
+    public void endDocument() {
+        System.out.println(DOCUMENT_END);
+    }
+
+    public void endElement(String uri, String localName, String qName) { }
+
+    public void startPrefixMapping(String prefix, String uri) { }
+
+    public void endPrefixMapping(String prefix) { }
+
+    public void setDocumentLocator(Locator locator) { }
+
+    public void characters(char[] ch, int start, int length) {  }
+
+    public void ignorableWhitespace(char[] ch, int start, int length) {  }
+
+    public void processingInstruction(String target, String data) {  }
+
+    public void skippedEntity(String name) { }
+
+}

xml/src/main/java/com/baeldung/xmlhtml/helpers/jaxp/JAXPHelper.java

@@ -0,0 +1,90 @@
+package com.baeldung.xmlhtml.helpers.jaxp;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.XMLReader;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import java.io.File;
+
+import static com.baeldung.xmlhtml.Constants.*;
+
+public class JAXPHelper {
+
+    private static void print(Document document) {
+        NodeList list = document.getChildNodes();
+        try {
+            for (int i = 0; i < list.getLength(); i++) {
+                Node node = list.item(i);
+                String message =
+                        node.getNodeType()
+                                + WHITE_SPACE
+                                + node.getNodeName()
+                                + LINE_BREAK;
+                System.out.println(message);
+            }
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+    }
+
+    public static void saxParser() {
+        SAXParserFactory spf = SAXParserFactory.newInstance();
+        spf.setNamespaceAware(true);
+        try {
+            SAXParser saxParser = spf.newSAXParser();
+            XMLReader xmlReader = saxParser.getXMLReader();
+            xmlReader.setContentHandler(new CustomHandler());
+            xmlReader.parse(XML_FILE_IN);
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+    }
+
+    public static void documentBuilder() {
+        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+        try {
+            DocumentBuilder db = dbf.newDocumentBuilder();
+            Document parsed = db.parse(new File(XML_FILE_IN));
+            Element xml = parsed.getDocumentElement();
+
+            Document doc = db.newDocument();
+            Element html = doc.createElement("html");
+            Element head = doc.createElement("head");
+            html.appendChild(head);
+
+            Element body = doc.createElement("body");
+            Element descendantOne = doc.createElement("p");
+            descendantOne.setTextContent("descendantOne: " +
+                    xml.getElementsByTagName("descendantOne")
+                            .item(0).getTextContent());
+            Element descendantThree = doc.createElement("p");
+            descendantThree.setTextContent("descendantThree: " +
+                    xml.getElementsByTagName("descendantThree")
+                            .item(0).getTextContent());
+            Element nested = doc.createElement("div");
+            nested.appendChild(descendantThree);
+
+            body.appendChild(descendantOne);
+            body.appendChild(nested);
+            html.appendChild(body);
+            doc.appendChild(html);
+
+            TransformerFactory tFactory = TransformerFactory.newInstance();
+            tFactory
+                    .newTransformer()
+                    .transform(new DOMSource(doc), new StreamResult(new File(JAXP_FILE_OUT)));
+
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+    }
+}

xml/src/main/java/com/baeldung/xmlhtml/helpers/stax/STAXHelper.java

@@ -0,0 +1,112 @@
+package com.baeldung.xmlhtml.helpers.stax;
+
+import com.baeldung.xmlhtml.pojo.stax.Body;
+import com.baeldung.xmlhtml.pojo.stax.CustomElement;
+import com.baeldung.xmlhtml.pojo.stax.NestedElement;
+
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+import java.io.FileInputStream;
+import java.io.FileWriter;
+
+import static com.baeldung.xmlhtml.Constants.*;
+
+public class STAXHelper {
+
+    private static XMLStreamReader reader() {
+        XMLStreamReader xmlStreamReader = null;
+        try {
+            xmlStreamReader = XMLInputFactory.newInstance().createXMLStreamReader(new FileInputStream(XML_FILE_IN));
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+        return xmlStreamReader;
+    }
+
+    private static XMLStreamWriter writer() {
+        XMLStreamWriter xmlStreamWriter = null;
+        try {
+            xmlStreamWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(new FileWriter(STAX_FILE_OUT));
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+        return xmlStreamWriter;
+    }
+
+    public static Body read() {
+        Body body = new Body();
+        try {
+            XMLStreamReader xmlStreamReader = reader();
+
+            CustomElement customElement = new CustomElement();
+            NestedElement nestedElement = new NestedElement();
+            CustomElement child = new CustomElement();
+
+            while (xmlStreamReader.hasNext()) {
+                xmlStreamReader.next();
+                if (xmlStreamReader.isStartElement()) {
+                    System.out.println(xmlStreamReader.getLocalName());
+                    if (xmlStreamReader.getLocalName().equals("descendantOne")) {
+                        customElement.setValue(xmlStreamReader.getElementText());
+                    }
+                    if (xmlStreamReader.getLocalName().equals("descendantThree")) {
+                        child.setValue(xmlStreamReader.getElementText());
+                    }
+                }
+            }
+
+            nestedElement.setCustomElement(child);
+            body.setCustomElement(customElement);
+            body.setNestedElement(nestedElement);
+
+            xmlStreamReader.close();
+
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+        return body;
+    }
+
+    public static void write(Body body) {
+        try {
+
+            XMLStreamWriter xmlStreamWriter = writer();
+            xmlStreamWriter.writeStartElement("html");
+            xmlStreamWriter.writeCharacters(BREAK + TAB);
+            xmlStreamWriter.writeStartElement("head");
+            xmlStreamWriter.writeCharacters(BREAK + TAB + TAB);
+            xmlStreamWriter.writeStartElement("meta");
+            xmlStreamWriter.writeEndElement();
+            xmlStreamWriter.writeCharacters(BREAK + TAB);
+            xmlStreamWriter.writeEndElement();
+            xmlStreamWriter.writeCharacters(BREAK + TAB);
+            xmlStreamWriter.writeStartElement("body");
+            xmlStreamWriter.writeCharacters(BREAK + TAB + TAB);
+            xmlStreamWriter.writeStartElement("p");
+            xmlStreamWriter.writeCharacters("descendantOne: " + body.getCustomElement().getValue());
+            xmlStreamWriter.writeEndElement();
+            xmlStreamWriter.writeCharacters(BREAK + TAB + TAB);
+            xmlStreamWriter.writeStartElement("div");
+            xmlStreamWriter.writeCharacters(BREAK + TAB + TAB + TAB);
+            xmlStreamWriter.writeStartElement("p");
+            xmlStreamWriter.writeCharacters(BREAK);
+            xmlStreamWriter.writeCharacters(TAB + TAB + TAB + TAB + "descendantThree: " + body.getNestedElement().getCustomElement().getValue());
+            xmlStreamWriter.writeCharacters(BREAK + TAB + TAB + TAB);
+            xmlStreamWriter.writeEndElement();
+            xmlStreamWriter.writeCharacters(BREAK + TAB + TAB);
+            xmlStreamWriter.writeEndElement();
+            xmlStreamWriter.writeCharacters(BREAK + TAB);
+            xmlStreamWriter.writeEndElement();
+            xmlStreamWriter.writeCharacters(BREAK);
+            xmlStreamWriter.writeEndDocument();
+            xmlStreamWriter.flush();
+            xmlStreamWriter.close();
+
+        } catch (Exception ex) {
+            System.out.println(EXCEPTION_ENCOUNTERED + ex);
+        }
+
+    }
+}