Processing XML with Java and JAXP - http://javaeecourse.devg.org

1. Java XML Programming Svetlin Nakov Bulgarian Association of Software Developers www.devbg.org

3. XML Parsers

8. The DOM Parser

9. DOM Parser Architecture

13. The SAX Parser

19. Introduction to JAXP

25. Using the DOM Parser

26. DOM Document Structure Document +--- Element <dots> +--- Text &quot;this is before the first dot | and it continues on multiple lines&quot; +--- Element <dot> +--- Text &quot;&quot; +--- Element <dot> +--- Text &quot;&quot; +--- Element <flip> | +--- Text &quot;flip is on&quot; | +--- Element <dot> | +--- Text &quot;&quot; | +--- Element <dot> | +--- Text &quot;&quot; +--- Text &quot;flip is off&quot; +--- Element <dot> +--- Text &quot;&quot; +--- Element <extra> | +--- Text &quot;stuff&quot; +--- Text &quot;&quot; +--- Comment &quot;a final comment&quot; +--- Text &quot;&quot; XML input: Document structure: <?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?> <dots> this is before the first dot and it continues on multiple lines <dot x=&quot;9&quot; y=&quot;81&quot; /> <dot x=&quot;11&quot; y=&quot;121&quot; /> <flip> flip is on <dot x=&quot;196&quot; y=&quot;14&quot; /> <dot x=&quot;169&quot; y=&quot;13&quot; /> </flip> flip is off <dot x=&quot;12&quot; y=&quot;144&quot; /> <extra>stuff</extra> <!-- a final comment --> </dots>

28. DOM Classes Hierarchy

29. Using DOM import javax.xml.parsers.*; import org.w3c.dom.*; // G et a DocumentBuilder object DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = null; try { db = dbf.newDocumentBuilder(); } catch (ParserConfigurationException e) { e.printStackTrace(); } // I nvoke parser to get a Document Document doc = db.parse(inputStream); Document doc = db.parse(file); Document doc = db.parse(url); Here’s the basic recipe for getting started:

31. More Document Accessors Node access methods: String getNodeName () short getNodeType () Document getOwnerDocument () boolean hasChildNodes () NodeList getChildNodes () Node getFirstChild () Node getLastChild () Node getParentNode () Node getNextSibling () Node getPreviousSibling () boolean hasAttributes () ... and more ... e.g. DOCUMENT_NODE, ELEMENT_NODE, TEXT_NODE, COMMENT_NODE, etc.

32. More Document Accessors Element extends Node and adds these access methods: String getTagName () boolean hasAttribute ( String name ) String getAttribute ( String name ) NodeList getElementsByTagName ( String name ) … and more … Document extends Node and adds these access methods: Element getDocumentElement () DocumentType getDoctype () ... plus the Element methods just mentioned ... ... and more ...

34. Reading and Parsing XML Documents with the DOM Parser Live Demo

36. More Document Manipulators Node manipulation methods: void setNodeValue ( String nodeValue ) Node appendChild ( Node newChild ) Node insertBefore ( Node newChild , Node refChild ) Node removeChild ( Node oldChild ) ... and more ... Element manipulation methods: void setAttribute ( String name , String value ) void removeAttribute ( String name ) … and more … Document manipulation methods: Text createTextNode ( String data ) Comment createCommentNode ( String data ) ... and more ...

37. Building Documents with the DOM Parser Live Demo

38. Using The StAX Parser

40. Parsing Documents with the StAX Parser – Example FileReader fileReader = new FileReader(&quot;Student.xml&quot;); XMLInputFactory factory = XMLInputFactory. newInstance (); XMLStreamReader reader = factory.createXMLStreamReader(fileReader); String element = &quot;&quot;; while (reader.hasNext()) { if (reader.isStartElement()) { element = reader.getLocalName(); } else if (reader.isCharacters() && !reader.isWhiteSpace()) { System. out .printf(&quot;%s - %s%n&quot;, element, reader.getText()); } reader.next(); } reader.close()

41. Parsing Documents with the StAX Parser Live Demo

42. Creating Documents with the StAX Parser – Example String fileName = &quot;Customers.xml&quot;; FileWriter fileWriter = new FileWriter(fileName); XMLOutputFactory factory = XMLOutputFactory. newInstance (); XMLStreamWriter writer = factory.createXMLStreamWriter(fileWriter); writer.writeStartDocument(); writer.writeStartElement(&quot;Customers&quot;); writer.writeStartElement(&quot;Customer&quot;); writer.writeStartElement(&quot;Name&quot;); writer.writeCharacters(&quot;ABC Pizza&quot;); writer.writeEndElement(); writer.writeStartElement(&quot;Address&quot;); writer.writeCharacters(&quot;1 Main Street&quot;); writer.writeEndElement(); writer.writeEndElement(); writer.writeEndElement(); writer.writeEndDocument(); writer.flush();

43. Parsing Documents with the StAX Parser Live Demo

44. Using XPath in Java Searching nodes in XML documents

48. Using XPath Live Demo

49. Modifying XML with DOM and XPath Live Demo

50. XSL Transformations in JAXP javax.xml.transform.Transformer

51. XSLT API

54. Transforming with XSL – Example <?xml version=&quot;1.0&quot;?> <library name=&quot;.NET Developer's Library&quot;> <book> <title>Programming Microsoft .NET</title> <author>Jeff Prosise</author> <isbn>0-7356-1376-1</isbn> </book> <book> <title>Microsoft .NET for Programmers</title> <author>Fergal Grimes</author> <isbn>1-930110-19-7</isbn> </book> </library> library.xml

55. Transforming with XSL – Example (2) <?xml version=&quot;1.0&quot; encoding=&quot;windows-1251&quot;?> <xsl:stylesheet version=&quot;1.0&quot; xmlns:xsl=&quot;http://www.w3.org/1999/XSL/Transform&quot;> <xsl:output method=&quot;xml&quot; encoding=&quot;utf-8&quot; indent=&quot;yes&quot; omit-xml-declaration=&quot;yes&quot;/> <xsl:template match=&quot;/&quot;> <html> <head> <meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset= utf-8 &quot; /> </head> <body> <h1>Моята библиотека</h1> <table bgcolor=&quot;#E0E0E0&quot; cellspacing=&quot;1&quot;> (example continues) library-xml2html.xsl

56. Transforming with XSL – Example (3) <tr bgcolor=&quot;#EEEEEE&quot;> <td><b>Заглавие</b></td> <td><b>Автор</b></td> </tr> <xsl:for-each select=&quot;/library/book&quot;> <tr bgcolor=&quot;white&quot;> <td><xsl:value-of select=&quot;title&quot;/></td> <td><xsl:value-of select=&quot;author&quot;/></td> </tr> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet> library-xml2html.xsl

57. Transforming with XSL – Example (4) public class XSLTransformDemo { public static void main(String[] args) throws TransformerException { TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer xslTransformer = tFactory.newTransformer( new StreamSource(&quot;library-xml2html.xsl&quot;)); xslTransformer.transform( new StreamSource(&quot; library .xml&quot;), new StreamResult(&quot; library . ht ml&quot;)); } } XSLTransformDemo.java

58. Transforming with XSL – Example (5) <html> <head> <meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=utf-8&quot;/> </head> <body> <h1>Моята библиотека</h1> <table bgcolor=&quot;#E0E0E0&quot; cellspacing=&quot;1&quot;> <tr bgcolor=&quot;#EEEEEE&quot;> <td><b>Заглавие</b></td> <td><b>Автор</b></td> </tr> (example continues) Result : library.html

59. Transforming with XSL – Example (6) <tr bgcolor=&quot;white&quot;> <td>Programming Microsoft .NET</td> <td>Jeff Prosise</td> </tr> <tr bgcolor=&quot;white&quot;> <td>Microsoft .NET for Programmers</td> <td>Fergal Grimes</td> </tr> </table> </body> </html> Result : library.html

60. XSL Transformations Live Demo