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package cn.sisy.xml;public class Book {	private int id;	private String name;	private float price;	public int getId() {		return id;	}	public void setId(int id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public float getPrice() {		return price;	}	public void setPrice(float price) {		this.price = price;	}	@Override	public String toString(){		return this.id+":"+this.name+":"+this.price;	}}

package cn.sisy.xml;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import cn.sisy.xml.Book;public class SaxParseService extends DefaultHandler{	private List
   
     books = null;	private Book book = null;	private String preTag = null;//作用是记录解析时的上一个节点名称		public List
    
      getBooks(InputStream xmlStream) throws Exception{		SAXParserFactory factory = SAXParserFactory.newInstance();		SAXParser parser = factory.newSAXParser();		SaxParseService handler = new SaxParseService();		parser.parse(xmlStream, handler);		return handler.getBooks();	}		public List
     
       getBooks(){		return books;	}		@Override	public void startDocument() throws SAXException {		books = new ArrayList
      
       ();	}	@Override	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {		if("book".equals(qName)){			book = new Book();			book.setId(Integer.parseInt(attributes.getValue(0)));		}		preTag = qName;//将正在解析的节点名称赋给preTag	}	@Override	public void endElement(String uri, String localName, String qName)			throws SAXException {		if("book".equals(qName)){			books.add(book);			book = null;		}		preTag = null;/**当解析结束时置为空。这里很重要，例如，当图中画3的位置结束后，会调用这个方法		，如果这里不把preTag置为null，根据startElement(....)方法，preTag的值还是book，当文档顺序读到图		中标记4的位置时，会执行characters(char[] ch, int start, int length)这个方法，而characters(....)方		法判断preTag!=null，会执行if判断的代码，这样就会把空值赋值给book，这不是我们想要的。*/	}		@Override	public void characters(char[] ch, int start, int length) throws SAXException {		if(preTag!=null){			String content = new String(ch,start,length);			if("name".equals(preTag)){				book.setName(content);			}else if("price".equals(preTag)){				book.setPrice(Float.parseFloat(content));			}		}	}	}
      
     
    
   

package cn.sisy.xml;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.util.List;import junit.framework.TestCase;import cn.sisy.xml.SaxParseService;import cn.sisy.xml.Book;public class ParseTest extends TestCase{	public void testSAX() throws Throwable{		SaxParseService sax = new SaxParseService();		//InputStream input = this.getClass().getClassLoader().getResourceAsStream("book.xml");		InputStream input = new FileInputStream(new File("book.xml"));		List
   
     books = sax.getBooks(input);		for(Book book : books){			System.out.println(book.toString());		}	}}
   

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