sax解析xml

package com.px.sax;

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;
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;

//用sax解析xml
public class Test2 extends DefaultHandler{
public static void main(String[] args) {
	SAXParserFactory sf=SAXParserFactory.newInstance();
	try {
		SAXParser sp=sf.newSAXParser();
		sp.parse(new File("E:\\students.xml"), new Test2());
	} catch (ParserConfigurationException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (SAXException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
}

@Override
public void characters(char[] ch, int start, int length) throws SAXException {
	System.out.print(new String(ch,start,length));
}

@Override
public void processingInstruction(String target, String data)
		throws SAXException {
	System.out.println("<?"+target+data+"?>");
}

@Override
public void endElement(String uri, String localName, String qName)
		throws SAXException {
	System.out.print("</"+qName+">");
}

@Override
public void startDocument() throws SAXException {
	System.out.println("<?xml version=\"1.0\" encoding=\"GB2312\"?>");
}

@Override
public void startElement(String uri, String localName, String qName,
		Attributes attributes) throws SAXException {
	System.out.print("<"+qName);
	int len=attributes.getLength();
	for(int i=0;i<len;i++){
		String v1=attributes.getValue(i);
		String v2=attributes.getQName(i);
		System.out.print(" "+v2+"="+v1);

	}
	System.out.print(">");
}
}




出现的效果：
<?xml version="1.0" encoding="GB2312"?>
<?xml-stylesheettype="text/xsl" href="students.xsl"?>
<students>
    <student sn=01>
        <name>张三</name>
        <age>18</age>
    </student>
    
    <student sn=02>
        <name>李四</name>
        <age>20</age>
    </student>
</students>