用SAX解析XML

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package com.shengsiyuan.xml.sax;

import java.io.File;
import java.util.Stack;

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 SaxTest2
{
    public static void main(String[] args) throws Exception
    {
        //step1： 获得SAX解析器工厂实例
        SAXParserFactory factory = SAXParserFactory.newInstance();
        
        //step2: 获得SAX解析器实例
        SAXParser parser = factory.newSAXParser();
        
        //step3: 开始进行解析
        parser.parse(new File("student.xml"), new MyHandler());
    }
}

class MyHandler2 extends DefaultHandler
{
    private Stack<String> stack = new Stack<String>();
    
    private String name;
    
    private String gender;
    
    private String age;
    
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException
    {
        stack.push(qName);
        
        for(int i = 0; i < attributes.getLength(); i++)
        {
            String attrName = attributes.getQName(i);
            String attrValue = attributes.getValue(i);
            
            System.out.println(attrName + "=" + attrValue);
        }
    }
    
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException
    {
        String tag = stack.peek();
        
        if("姓名".equals(tag))
        {
            name = new String(ch, start,length);
        }
        else if("性别".equals(tag))
        {
            gender = new String(ch, start, length);
        }
        else if("年龄".equals(tag))
        {
            age = new String(ch, start, length);
        }
    }
    
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException
    {
        stack.pop(); //表示该元素已经解析完毕，需要从栈中弹出
        
        if("学生".equals(qName))
        {
            System.out.println("姓名：" + name);
            System.out.println("性别：" + gender);
            System.out.println("年龄：" + age);
            
            System.out.println();
        }
        
    }
}