使用SAX解析XMl通用哟

[java]
package com.popo.xml; 
 
import java.io.IOException; 
import java.io.StringBufferInputStream; 
import java.lang.reflect.Array; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.Iterator; 
import java.util.LinkedList; 
import java.util.Set; 
 
import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.parsers.SAXParser; 
import javax.xml.parsers.SAXParserFactory; 
 
import org.dom4j.io.DOMReader; 
import org.xml.sax.Attributes; 
import org.xml.sax.SAXException; 
import org.xml.sax.helpers.DefaultHandler; 
 
public class SAXTest { 
 
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
        // TODO Auto-generated method stub 
        SAXParserFactory sf = SAXParserFactory.newInstance();  
        MyDefaultHandler df = new MyDefaultHandler(); 
        String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + 
                "<data>"+ 
                "<grade gredenum='gd1'>" + 
                "   <class classnum='cl1'>" + 
                "       <std name='xiaohong' age='16' />" + 
                "       <std name='xiaoming' age='18' > =========================================================</std>" + 
                "       <teacher name='tch_li' cource='chemistry'/>" + 
                "       <teacher name='tch_jia' cource='physics'/>"+ 
                "   </class> " + 
                "</grade >"+ 
                "<grade gredenum='gd2'>" + 
                "   <class classnum='cl1'>" + 
                "       <std name='monkeysun' age='530' />" + 
                "       <std name='bajiepig' age='360' />"+ 
                "       <std name='cleanwu' age='320' />"+ 
                "   </class> " + 
                "   <class classnum='cl2'>" + 
                "aafafafa" + 
                "</class>" + 
                "</grade >"+ 
                "</data>" 
                ; 
        /**
         * "<grade n='2'>" +
                "   <class n=1>" +
                "       <std name='2l' age='22' />" +
                "       <std name='23' age='23' />"+
                "   </class> " +
                "   <class n=2>" +
                "       <std name='2l' age='22' />" +
                "       <std name='23' age='23' />"+
                "   </class>"+
                "</grade >" +
                
         */ 
        try { 
            SAXParser sp = sf.newSAXParser(); 
            StringBufferInputStream in = new StringBufferInputStream(xml); 
            sp.parse(in, df); 
            System.out.println(); 
            Data data = df.root; 
            System.out.println(data); 
        } catch (ParserConfigurationException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } catch (SAXException e) { 
            // TODO Au

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