XML Tutorials - Herong's Tutorial Examples - v5.25, by Herong Yang
SAXBrowser.java - SAX Interface Java Example
This section provides a tutorial example on how to parse an XML file and print it back in a tree format using SAX interface in Java - JDK 1.8.
Let's build a simple SAX based XML browser by implementing those event handler methods defined in the org.xml.sax.DocumentHandler interface:
/* SAXBrowser.java * Copyright (c) 2002-2018 HerongYang.com. All Rights Reserved. */ import java.io.File; import java.io.IOException; import javax.xml.parsers.SAXParserFactory; import javax.xml.parsers.SAXParser; import javax.xml.parsers.ParserConfigurationException; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; class SAXBrowser { public static void main(String[] args) { try { File x = new File(args[0]); SAXParserFactory f = SAXParserFactory.newInstance(); SAXParser p = f.newSAXParser(); DefaultHandler h = new MyContentHandler(); p.parse(x,h); } catch (ParserConfigurationException e) { System.out.println(e.toString()); } catch (SAXException e) { System.out.println(e.toString()); } catch (IOException e) { System.out.println(e.toString()); } } private static class MyContentHandler extends DefaultHandler { static String p = "_"; public void startDocument() throws SAXException { System.out.println("Starting document..."); } public void endDocument() throws SAXException { System.out.println("Ending document..."); } public void startElement(String ns, String sName, String qName, Attributes attrs) throws SAXException { String eName = sName; if (sName.equals("")) eName = qName; System.out.println("e"+p+eName); if (attrs!=null) { for (int i=0; i<attrs.getLength(); i++) { String aName = attrs.getLocalName(i); if (aName.equals("")) aName = attrs.getQName(i); System.out.println("a"+p+" "+aName+"=" +attrs.getValue(i)); } } p = p + "_"; } public void endElement(String ns, String sName, String qName) throws SAXException { p = p.replaceFirst("__", "_"); } public void characters(char buf[], int offset, int len) throws SAXException { String s = new String(buf, offset, len); System.out.println("c"+p+s); } public void ignorableWhitespace(char buf[], int offset, int len) throws SAXException { String s = new String(buf, offset, len); System.out.println("i"+p+s); } } }
Note that:
Let's try this with hello.xml:
<?xml version="1.0"?> <p>Hello world!</p>
If you compile and run this sample program in JDK (Java Development Kit), you will get:
herong> java SAXBrowser hello.xml Starting document... e_p c__Hello world! Ending document...
Excellent. The program seems to be working.
Table of Contents
Introduction of XML (eXtensible Markup Language)
DOM (Document Object Model) Programming Interface
►SAX (Simple API for XML) Programming Interface
What Is SAX (Simple API for XML)
Using SAX Implementation in JDK
►SAXBrowser.java - SAX Interface Java Example
DTD (Document Type Definition) Introduction
Validating an XML Document against the Specified DTD Document Type
XSD (XML Schema Definition) Introduction
Validating XML Documents Against Specified XML Schemas
XSL (Extensible Stylesheet Language) Introduction
XSLT (XSL Transformations) Introduction
XSLT Elements as Programming Statements
Control and Generate XML Element in the Result
PHP Extensions for XML Manipulation
Processing XML with Python Scripts
XML Tools Plugin for Notepad++
XML Plugin Packages for Atom Editor