package itcast.sax;

 import java.io.IOException;

 import javax.xml.parsers.ParserConfigurationException;

 import javax.xml.parsers.SAXParser;

 import javax.xml.parsers.SAXParserFactory;

 import org.xml.sax.SAXException;

 import org.xml.sax.XMLReader;

 public class Demo {

     public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {

         //1、创建解析工程

         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、设置内容处理器

         reader.setContentHandler(new TagValueHandler());

         //5、读取xml文档内容

         reader.parse("src/book.xml");

     }

 }

 package itcast.sax;

 import org.xml.sax.Attributes;

 import org.xml.sax.SAXException;

 import org.xml.sax.helpers.DefaultHandler;

 //获取指定标签值

 public class TagValueHandler extends DefaultHandler {

     private String currentTag;//记住当前解析到的是什么标签

     private int needNumber=1;

     private int currentNumber;

     @Override

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

         if("editor".equals(currentTag)&&currentNumber==needNumber){

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

         }

     }

     @Override

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

             throws SAXException {

         currentTag=null;

     }

     @Override

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

             Attributes atts) throws SAXException {

         currentTag=name;

         if(currentTag.equals("editor")){

             currentNumber++;

         }

     }

 }

 package itcast.sax;

 import org.xml.sax.Attributes;

 import org.xml.sax.ContentHandler;

 import org.xml.sax.Locator;

 import org.xml.sax.SAXException;

 public class ListHandle 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.getQName(i);

             String attValue = atts.getValue(i);

             System.out.println(attName+"="+attValue);

         }

     }

     @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 startDocument() throws SAXException {

     }

     @Override

     public void endDocument() throws SAXException {

         // TODO Auto-generated method stub

     }

     @Override

     public void endPrefixMapping(String arg0) throws SAXException {

         // TODO Auto-generated method stub

     }

     @Override

     public void ignorableWhitespace(char[] arg0, int arg1, int arg2)

             throws SAXException {

         // TODO Auto-generated method stub

     }

     @Override

     public void processingInstruction(String arg0, String arg1)

             throws SAXException {

         // TODO Auto-generated method stub

     }

     @Override

     public void setDocumentLocator(Locator arg0) {

         // TODO Auto-generated method stub

     }

     @Override

     public void skippedEntity(String arg0) throws SAXException {

         // TODO Auto-generated method stub

     }

     @Override

     public void startPrefixMapping(String arg0, String arg1)

             throws SAXException {

         // TODO Auto-generated method stub

     }

 }

 <?xml version="1.0" encoding="UTF-8"?>

 <书架>

     <书>

         <bookname name="zero">java jiuyepeixunjiaocheng</bookname>

         <editor>zhangxiaoxiang</editor>

         <price>109yuan</price>

     </书>

     <书>

         <bookname>javaWebprogramming</bookname>

         <editor>lihuoming</editor>

         <price>28.00yuan</price>

     </书>

 </书架>