SAX解析XML文件

import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;

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


public class XMLTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		try {
			String xmlString = "<student><name>tom</name><age>20</age></student>";
			SAXParserFactory factory = SAXParserFactory.newInstance();
			XMLReader reader = factory.newSAXParser().getXMLReader();
			reader.setContentHandler(new MyContenntHandler());
			reader.parse(new InputSource(new StringReader(xmlString)));
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

class MyContenntHandler extends DefaultHandler{

	@Override
	public void characters(char[] ch, int start, int length) throws SAXException {
		super.characters(ch, start, length);
	}

	@Override
	public void endDocument() throws SAXException {
		super.endDocument();
	}

	@Override
	public void endElement(String uri, String localName, String qName) throws SAXException {
		super.endElement(uri, localName, qName);
	}

	@Override
	public void startDocument() throws SAXException {
		super.startDocument();
	}

	@Override
	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
		super.startElement(uri, localName, qName, attributes);
	}
	
}

最重要的是复写DefaultHandler类，里面的几个方法的执行顺序可以写一个测试程序