简单用JAXP的SAX方式（事件驱动）解析XML文件：

文件（1.XML）

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<class>

    <student>

        <name>张三</name>

        <sid>111111</sid>

    </student>

    <student>

        <name>李四</name>

        <sid>222222</sid>

    </student>

</class>

 Java代码

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 JaxpSax {

    public static void main(String[] args) throws Exception {

        SAXParserFactory factory=SAXParserFactory.newInstance();

        SAXParser parser=factory.newSAXParser();

        parser.parse("src/1.xml", new MyHandler1());//在控制台打印出XML文件

        //parser.parse("src/1.xml", new MyHandler2());//在控制台打印所有学生姓名

    }

}

class MyHandler1 extends DefaultHandler{

    @Override

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

            Attributes attributes) throws SAXException {

        System.out.print("<"+qName+">");

    }

    @Override

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

            throws SAXException {

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

    }

    @Override

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

            throws SAXException {

        System.out.print("</"+qName+">");

    }

}

class MyHandler2 extends DefaultHandler{

    boolean flag=true;

    @Override

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

            Attributes attributes) throws SAXException {

        if(qName.equals("name")) flag=true;

    }

    @Override

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

            throws SAXException {

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

    }

    @Override

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

            throws SAXException {

        if(qName.equals("name")) flag=false;

    }

}

控制台运行结果：

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" 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