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>