sax解析

<?xml version="1.0" encoding="UTF-8" standalone="no"?><书架>
    <书>
        <书名 name="xxxx">何茂赟自传</书名>
        <作者>何茂赟</作者>
        
   <售价>500.00</售价></书>
    <书>
        <书名>何茂赟自传2</书名>
        <作者>何茂赟</作者>
        <售价>100.00元</售价>
    </书>
</书架>

//得到xml文档所有内容
package sax;

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.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class sax {
    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
        //1、创建解析工厂
        SAXParserFactory factory=SAXParserFactory.newInstance();
        //2、得到解析器
        SAXParser sp=factory.newSAXParser();
        //3、得到读取器
        XMLReader reader=sp.getXMLReader();
        //4、设置内容处理
        reader.setContentHandler(new ListHandler());
        //5、读取xml文档内容
        reader.parse("src/sax/shu.xml");
    }

}
//得到xml文档所有内容
class ListHandler implements ContentHandler{

    @Override
    public void startElement(String uri, String localName, String name,
            Attributes atts) throws SAXException {
        System.out.println("<"+name+">");
        for(int i=0;atts!=null && i<atts.getLength();i++)
        {
            String attname=atts.getLocalName(i);
            String value=atts.getValue(i);
            System.out.println(attname+"="+value);
        }
        
    }
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        System.out.println(new String(ch,start,length));
        
    }

    @Override
    public void endElement(String uri, String localName, String name)
            throws SAXException {
        System.out.println("</"+name+">");
        
    }
    @Override
    public void endDocument() throws SAXException {
        // TODO Auto-generated method stub
        
    }

    

    @Override
    public void endPrefixMapping(String prefix) throws SAXException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void ignorableWhitespace(char[] ch, int start, int length)
            throws SAXException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void processingInstruction(String target, String data)
            throws SAXException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void setDocumentLocator(Locator locator) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void skippedEntity(String name) throws SAXException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void startDocument() throws SAXException {
        // TODO Auto-generated method stub
        
    }

    

    @Override
    public void startPrefixMapping(String prefix, String uri)
            throws SAXException {
        // TODO Auto-generated method stub
        
    }
    
}

//获取xml文档指定位置的值
package sax;

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.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class sax1 {
    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
        //1、创建解析工厂
        SAXParserFactory factory=SAXParserFactory.newInstance();
        //2、得到解析器
        SAXParser sp=factory.newSAXParser();
        //3、得到读取器
        XMLReader reader=sp.getXMLReader();
        //4、设置内容处理
        reader.setContentHandler(new TagValueHandler());
        //5、读取xml文档内容
        reader.parse("src/sax/shu.xml");
    }

}
//获取xml文档指定位置的值
class TagValueHandler extends DefaultHandler
{

    private String currentTag;   //记住当前解析到的是什么标签
    private int needNumber=2;
    private int currentNumber;
    @Override
    public void startElement(String uri, String localName, String name,
            Attributes attributes) throws SAXException {
        currentTag=name;
        if(currentTag.equals("作者"))
        {
            currentNumber++;
        }
    }
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if("作者".equals(currentTag)&&currentNumber==needNumber)
        {
            System.out.print(new String(ch,start,length));
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        currentTag=null;
    }

    
    
}