事件驱动方式的解析

package com.gyarmy.sax;



import java.io.IOException;



import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;



import org.xml.sax.*;

import org.xml.sax.helpers.DefaultHandler;

/*

 * 结论:

 * 碰到实现接口中的方法,但是只有很少的方法和我们有关时,去找默认的实现类

 * 

 * 

 */

public class SaxTest1 {



	public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {

		// TODO Auto-generated method stub

		//拿到工厂

				SAXParserFactory factory = SAXParserFactory.newInstance();

				

				//拿到解析器对象

				SAXParser parser =  factory.newSAXParser();

				XMLReader reader = parser.getXMLReader();

				reader.setContentHandler(new MyContentHandler());

				//去解析 XML文件

				reader.parse("src/demo1.xml"); 

	}

}



class MyContentHandler extends DefaultHandler{

	//重写目标方法

		//alt + shift + S 

		//选择重写的方法

	//定义boolean值 和 计数器,是非常常规的小技巧

	protected int i=0;

	

	@Override

	public void startDocument() throws SAXException {

		// TODO Auto-generated method stub

		//System.out.println("文档开始");

	}



	@Override

	public void endDocument() throws SAXException {

		// TODO Auto-generated method stub

		//System.out.println("文档结束");

	}



	@Override

	public void startElement(String uri, String localName, String qName,

			Attributes attributes) throws SAXException {

		// TODO Auto-generated method stub

		//System.out.println("元素开始:"+qName);

		

		if(qName == "售价")

		{

			//endElement();

			i = 1;

			//System.out.println(attributes.get);

			//return;

		}

		/*

		for(int i=0;i<attributes.getLength();i++)

		{

			String name = attributes.getQName(i);

			String value = attributes.getValue(i);

			System.out.println(i + "--" + name+":"+value);

		}

		*/

		

		

	}



	@Override

	public void endElement(String uri, String localName, String qName)

			throws SAXException {

		// TODO Auto-generated method stub

		if(qName == "售价")

		{

			

			i = 0;

		}

		//System.out.println("元素结束:"+qName);

	}



	@Override

	public void characters(char[] ch, int start, int length)

			throws SAXException {

		// TODO Auto-generated method stub

		if(i == 1)

		{

			System.out.println(new String(ch,start,length));

		}

	}

	

	

}