sax解析案例(javabean封装xml文档数据)

package itcast.sax;

import java.io.IOException;
import java.util.List;

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 {
    
    @SuppressWarnings("unchecked")
    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
        BeanListHandler handler  = new BeanListHandler();
        reader.setContentHandler(handler);
        
        //5、读取xml文档内容
        reader.parse("src/book.xml");
        

        List<Book> list = handler.getList();
        System.out.println(list);
    }

}

package itcast.sax;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

//把xml文档中的每一本封装到一个book对象，并把多个book对象放在一个list集合中
public class BeanListHandler extends DefaultHandler {
    
    private List list = new ArrayList();
    private String currentTag;
    private Book book;

    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if("bookname".equals(currentTag)){
            String bookname = new String(ch,start,length);
            book.setName(bookname);
        }
        if("editor".equals(currentTag)){
            String author = new String(ch,start,length);
            book.setAuthor(author);
        }
        if("price".equals(currentTag)){
            String price = new String(ch,start,length);
            book.setPrice(price);
        }
    }

    @Override
    public void endElement(String uri, String localName, String name)
            throws SAXException {
        if(name.equals("书")){
            list.add(book);
            book=null;
        }
        currentTag = null;
    }

    @Override
    public void startElement(String uri, String localName, String name,
            Attributes attributes) throws SAXException {
        
        currentTag=name;
        if("书".equals(currentTag)){
            book = new Book();
        }
        
    }

    public List getList() {
        return list;
    }

}

<?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>