java SAX XML

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;  
import org.xml.sax.helpers.DefaultHandler;
public class SAXParserTest extends DefaultHandler{
    public SAXParserTest() {
        super();
    } 
    public void startElement(String uri,String localName,String qName,Attributes attr){  
       if(attr.getLength()>0){  
           for(int i = 0;i<attr.getLength();i++){  
               System.out.println(attr.getQName(i)+" = "+attr.getValue(i));  
           }  
       }  
    }  
    public static void main(String[] args){  
        try{    
          //实例化用于分析的工厂
            SAXParserFactory factory = SAXParserFactory.newInstance();
           //实例化分析类
            SAXParser parser = factory.newSAXParser();
            SAXParserTest handler = new SAXParserTest();  
            parser.parse("example.xml",handler);  
           }catch(Exception e){  
            System.out.println(e.toString());  
        }  
    }  
 }