• Home
• Java
• Example
• Java
• XmlParsing
• Java XML Parsing Using DOM

• Questions: Ask
• Latest
• Tutorials:Latest
• Topics

Ads

Tutorials   

Java XML Parsing Using SAX

To Parse XML document using SAX parser method you need to follow the following steps.

Consider the following XML file

Students.xml

<?xml version="1.0" encoding="UTF-8"?>
<Students>
    <Student type="regular">
       <Name>Joe</Name>
       <RollNo>21</RollNo>
       <Age>25</Age>
    </Student> 
    <Student type="open">
       <Name>Ramson</Name>
       <RollNo>23</RollNo>
       <Age>24</Age>
    </Student> 
</Students>

1. At first Create the SAX Parser as

// getting SAXParserFactory instance
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();

// Getting SAXParser object from AXParserFactory instance
SAXParser saxParser = saxParserFactory.newSAXParser();

// Parsing XML Document by calling parse method of SAXParser class
saxParser.parse("C:\\Students.xml", this);

2. Override the startElement() methods of DefaultHandler

@Override
public void startElement(String uri, String localName, String qName,
	Attributes attributes) throws SAXException {
	value = "";
	if (qName.equalsIgnoreCase("Student")) {
		System.out.print(attributes.getValue("type") + "\t");
	}
}

3. Override the characters() methods of DefaultHandler

public void characters(char[] ch, int start, int length)
		throws SAXException {
	value = new String(ch, start, length);
}

4. Override the endElement() methods of DefaultHandler

public void endElement(String uri, String localName, String qName)
	throws SAXException {
	if (qName.equalsIgnoreCase("Name")) {
		System.out.print(value + "\t");
	}
}

A complete java class is given below based on above explanation

XmlParsingUsingSax.java

package net.roseindia;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class XmlParsingUsingSax extends DefaultHandler {

	private String value;

	public static void main(String[] args) {
		System.out.println("Type\tName\tRollNo\tAge\n");
		new XmlParsingUsingSax().parseXmlDocument();
	}

	public void parseXmlDocument() {
		try {
			// getting SAXParserFactory instance
			SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();

			// Getting SAXParser object from AXParserFactory instance
			SAXParser saxParser = saxParserFactory.newSAXParser();

			// Parsing XML Document by calling parse method of SAXParser class
			saxParser.parse("C:\\Students.xml", this);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// Overriding characters() method of DefaultHandler class
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		value = new String(ch, start, length);
	}

	// Overriding startElement() method of DefaultHandler class
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		value = "";
		if (qName.equalsIgnoreCase("Student")) {
			System.out.print(attributes.getValue("type") + "\t");
		}
	}

	// Overriding endElement() method of DefaultHandler class
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if (qName.equalsIgnoreCase("Name")) {
			System.out.print(value + "\t");
		}

		if (qName.equalsIgnoreCase("RollNo")) {
			System.out.print(value + "\t");
		}
		if (qName.equalsIgnoreCase("Age")) {
			System.out.print(value + "\n");
		}
	}
}

When you run this application it will display message as shown below:

Type Name RollNo Age regular Joe 21 25 open Ramson 23 24

Download Select Source Code

Advertisements