Java API for XML Processing XML parsing model SAX

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

What is JAXP ? Java API for XML Parsing JAXP 1.0 (1999) JAXP 1.1 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+

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

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

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

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

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 ) { }

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)

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 { }

Processing XML with SAX - Using SAX Parser

Sample SAX Parsing