用JAXP的SAX方式解析XML文件

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：

aaarticlea/png;base64,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" alt="" />