xml sax 解析

package cn.ouc.xml.sax;

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

import org.xml.sax.helpers.DefaultHandler;

public class Sax {
	public static void main(String[] args) throws Exception {
		//获得解析工厂实例
		SAXParserFactory factory = SAXParserFactory.newInstance();
		//获得解析器
		SAXParser parser = factory.newSAXParser();
		DefaultHandler dh = new MyDefaultHandler();
		//解析xml文档
		parser.parse("books.xml",dh);
		System.out.println("done");
	}
}

MyDefaultHandler.java 继承DefaultHandler 类

package cn.ouc.xml.sax;

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

public class MyDefaultHandler extends DefaultHandler{
	
	@Override
	public void startDocument() throws SAXException {
		System.out.println("文档开始");
	}

	@Override
	/**
	 * 如果xml文件使用了schema约束 <xs:element>
	 * 	 * uri:schema -- targetNameSpace   
	 *   * localName--element
	 *   * qName---xs:element
	 * 如果不使用
	 *   * uri:null
	 *   * localName:null
	 *   * qName : element
	 *   
	 * Attributes:当前元素的所有的属性的集合
	 */
	public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException {
		System.out.println("元素开始" + qName + " *** " + attributes.getValue("id"));
	}
	
	
	@Override
	public void characters(char[] ch,int start,int length)
			throws SAXException {
		System.out.println(new String(ch,start,length));
		
	}


	@Override
	public void endElement(String uri,String qName)
			throws SAXException {
		System.out.println("元素结束：" + qName);
	}

	@Override
	public void endDocument() throws SAXException {
		System.out.println("文档结束");
	}
	

}