XML 文件的操作(五)用sax解析xml 读取xml

<?xml version="1.0" encoding="gb2312"?>

<?xml-stylesheet type="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>

<?xml version="1.0" encoding="gb2312"?>
<?xml-stylesheet type="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>

使用SAX读取XML文件：

package com.ibm.xml;

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;


/**
 * 使用SAX读取XML文件
 * @author Administrator
 *
 */
public class SAXPrinter extends DefaultHandler {

    /**
     * 重新的方法
     */
    public void startDocument() throws SAXException
    {
        System.out.println("<?xml version=\"1.0\" encoding='gb2312'?>");
    }

    /**
     * 重新的方法
     */
    public void processingInstruction(String target, String data) throws SAXException
    {
        System.out.println("<?"+target+" "+data+"?>");
    }

    /**
     * 重新的方法
     */
    public void startElement(String uri, String localName, String qName, Attributes attrs) throws SAXException
    {
        System.out.print("<"+qName);
        int len=attrs.getLength();

        for(int i=0;i<len;i++)
        {
            System.out.print(" ");
            System.out.print(attrs.getQName(i));
            System.out.print("=\"");
            System.out.print(attrs.getValue(i));
            System.out.print("\"");
        }
        System.out.print(">");
    }

    /**
     * 重新的方法
     */
    public void characters(char[] ch, int start, int length) throws SAXException
    {
        System.out.print(new String(ch,start,length));
    }

    /**
     * 重新的方法
     */
    public void endElement(String uri, String localName, String qName) throws SAXException
    {
        System.out.print("</"+qName+">");
    }

    public static void main(String arge[]){
        SAXParserFactory spf=SAXParserFactory.newInstance();
        try
        {
            SAXParser sp=spf.newSAXParser();
            sp.parse(new File("students.xml"),new SAXPrinter());
        }
        catch (ParserConfigurationException e)
        {

            e.printStackTrace();
        }
        catch (SAXException e)
        {

            e.printStackTrace();
        }
        catch (IOException e)
        {
            // TODO 自动生成 catch 块
            e.printStackTrace();
        }
    }

}