Java API for XML Processing

1. Java API for XML Processing XML parsing model SAX

2. Contents • What is JAXP ? • Uses for JAXP • JAXP API Model & Implementations • Processing XML with SAX

3. What is JAXP ? • Java API for XML Parsing • JAXP 1.0 (1999) • Supported SAX 1.0 and DOM Level 1 • JAXP 1.1 • Supports SAX 2.0 & extension, DOM Level 2 • JAXP 1.3 ( included in J2SE 5.0 ) • Supports SAX 2.0.2, DOM Level 3 • Include Xerces ver 2.6.2+

4. Uses for JAXP • Pluggability layer • Change parser without affecting the application logic • Standard interfaces that encapsulate the details behind parser interactions • choose a parser provider that best suits the requirements of the service

5. JAXP API Model & Implementations • Parsing classes • Javax.xml.parsers package • Transformaction classes • Javax.xml.transform package • Many implementation • Sun Crimson(included JDK1.4) • ApacheXerces, IBM, Oracle

6. Processing XML with SAX (1) • Event-driven processing model • Data elements are interpreted and callback • Biggest advantage • Not load XML documents ( fast, lightweight )

7. Processing XML with SAX (2) • Steps • 1. Getting Factory and Parser class • 2. Setting options • Setting namespace, validation, features • 3. Implement DefaultHandler class • 4. Using SAX Parser

8. Processing XML with SAX- Getting Factory and Parser class try { SAXParserFactory saxFactory = SAXParserFactory.newInstance(); SAXParser saxParser = saxFactory.newSAXParser(); } catch ( FactoryConfigurationError fce ) { // handle exception here } catch ( ParserConfigurationError pce ) { // handle exception here }

9. Processing XML with SAX- Setting options Setting Namespace factory.setNameSpaceAware(boolean) boolean parser.isNamespaceAware() Setting Validation factory.setValidation(boolean) boolean parser.isValidating() Setting Features factory.setFeature(strName, boolean) boolean factory.getFeature(strName)

10. Processing XML with SAX- Implement DefaultHandler class public class MySAXHandler extends DefaultHandler { public MySAXHandler() { } // overiding method public void startDocument() throws SAXException { } public void endDocument() throws SAXException { } public void characters(char[] buf, int offset, int len) throws SAXException { } public void startElement(String namespaceURI, String localName, String rowName, Attributes attrs ) throws SAXException { } public void endElement(String namespaceURI, String localName, String rowName) throws SAXException { }

11. Processing XML with SAX- Using SAX Parser

12. Sample SAX Parsing