sax技术操作xml

package com.xml.zh;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.*;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SaxTest {
    /**
     * 运用Sax技术来操作xml
     * @param args
     * @throws SAXException 
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception{
        // TODO Auto-generated method stub
        //1.创建SaxparseFactory
        SAXParserFactory spf =SAXParserFactory.newInstance();
        //2.创建Saxparser解析器
        SAXParser saxparser = spf.newSAXParser();
        //3.把xml文件的事件处理对象关联
        saxparser.parse("src/class.xml",new defaultHander());
    }
}
//定义事件处理类
class defaultHander extends DefaultHandler{
    boolean isName=false;
    //发现文档的文本
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        // TODO Auto-generated method stub
        //遍历某一个元素的文本
        if(!new String(ch,start,length).trim().equals("") && isName)
            System.out.println(new String(ch,start,length));
        //遍历
        //System.out.println(new String(ch,start,length));
        super.characters(ch, start, length);
    }
    //发现文档的结束
    @Override
    public void endDocument() throws SAXException {
        // TODO Auto-generated method stub
        super.endDocument();
    }
    //发现文档的一个元素的结束
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        // TODO Auto-generated method stub
        super.endElement(uri, localName, qName);
    }
    //发现文档的开始
    @Override
    public void startDocument() throws SAXException {
        // TODO Auto-generated method stub
        super.startDocument();
    }
    //发现xml文档的一个元素开始
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        // TODO Auto-generated method stub
        //System.out.println("name = "+qName);
        if(qName.equals("mingzi")){
            isName = true;
        }else{
            isName = false;
        }
        super.startElement(uri, localName, qName, attributes);
    }
}