jdk工具类____xml解析SAX解析

package com.cnse.test;
import java.util.Date;  

/** 
 * 图书 
 */  
public class Book {  
  
    /** 
     * 图书编号 
     */  
    private String isbn;  
      
    /** 
     * 书名 
     */  
    private String name;  
      
    /** 
     * 作者 
     */  
    private String author;  
      
    /** 
     * 出版社 
     */  
    private String publishing;  
      
    /** 
     * 发布时间 
     */  
    private Date pubdate;  
      
    /** 
     * 价格 
     */  
    private double price;  
  
    public String getIsbn() {  
        return isbn;  
    }  
  
    public void setIsbn(String isbn) {  
        this.isbn = isbn;  
    }  
  
    public String getName() {  
        return name;  
    }  
  
    public void setName(String name) {  
        this.name = name;  
    }  
  
    public String getAuthor() {  
        return author;  
    }  
  
    public void setAuthor(String author) {  
        this.author = author;  
    }  
  
    public String getPublishing() {  
        return publishing;  
    }  
  
    public void setPublishing(String publishing) {  
        this.publishing = publishing;  
    }  
  
    public Date getPubdate() {  
        return pubdate;  
    }  
  
    public void setPubdate(Date pubdate) {  
        this.pubdate = pubdate;  
    }  
  
    public double getPrice() {  
        return price;  
    }  
  
    public void setPrice(double price) {  
        this.price = price;  
    }  
      
    public String toString() {  
        return "name: " + name + " isbn: " + isbn + " author: " + author  
                + " publishing: " + publishing + " pubdate: " + pubdate  
                + " price: " + price;  
    }  
}  

//

package com.cnse.test;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
  
/** 
 * 使用SAX解析XML文件 
 */  
public class SaxHelper {  
      
    private static SAXParserFactory spf;  
  
    /** 
     * 使用SAX方式解析XML文件 
     * @param is XML文件输入流 
     * @return  
     */  
    public static List<Book> saxReader(InputStream is) {  
        try {  
            if (spf == null)  
             spf = SAXParserFactory.newInstance();  
            SAXParser saxParser = spf.newSAXParser();   
            XmlContentHandler xmlContentHandler = new XmlContentHandler();  
            saxParser.parse(is, xmlContentHandler);  
            return xmlContentHandler.getBooks();  
        } catch (Exception e) {  
            e.printStackTrace();  
            return null;  
        } finally {  
            try {  
                is.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
    }  
    
    
    public static void main(String[] args) throws Exception {
		FileInputStream fis=new FileInputStream("src/test.xml");
		List<Book> list=saxReader(fis);
		for (Book book : list) {
			System.out.println(book);
		}
	}
      
}  
  

//

package com.cnse.test;

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

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

  
/** 
 * SAX解析XML文件的事件处理器 
 */  
public class XmlContentHandler extends DefaultHandler {  
      
    private Book book;  //保存每一个节点的对象  
      
    private List<Book> books; //保存已解析好的节点对象  
      
    private String preTag;      //保存当前正在解析的节点标签名  
      
    @Override  
    public void startDocument() throws SAXException {  
        System.out.println("开始解析文档...");  
        books = new ArrayList<Book>();  
    }  
      
    @Override  
    public void startElement(String uri, String localName, String name,  
            Attributes attributes) throws SAXException {  
        if (name.equals("book") && book == null) {  
            book = new Book();  
            book.setIsbn(attributes.getValue("", "isbn"));  
        }  
          
        preTag = name;  //记录当前开始节点名  
    }  
      
    @Override  
    public void characters(char[] ch, int start, int length)  
            throws SAXException {  
        if (book != null && preTag != null && !"book".equals(preTag) && !"books".equals(preTag)) {  
            String data = new String(ch,start,length);  
            if (!"".equals(data.trim())) {  
                if ("name".equals(preTag)) {  
                    book.setName(data);  
                } else if ("author".equals(preTag)) {  
                    book.setAuthor(data);  
                } else if ("publishing".equals(preTag)) {  
                    book.setPublishing(data);  
                } else if ("pubdate".equals(preTag)) {  
                    book.setPubdate(new Date());  
                } else if ("price".equals(preTag)) {  
                    book.setPrice(Double.parseDouble(data));  
                }  
            }  
        }  
    }  
      
    @Override  
    public void endElement(String uri, String localName, String name)  
            throws SAXException {  
        if ("book".equals(name) && book != null) {  
            books.add(book);  
            book = null;    //一个节点的结束,代表一本书的信息解析完成,所以要将book设为null  
        }  
        preTag = null;      //同时将当前书的节点设为null  
    }  
      
    @Override  
    public void endDocument() throws SAXException {  
        System.out.println("XML文件解析结束...");  
        System.out.println("结果:" + books);  
    }  
  
    /** 
     * 获得解析后的数据 
     * @return 
     */  
    public List<Book> getBooks() {  
        return books;  
    }  
      
}  

//

<?xml version="1.0" encoding="UTF-8"?>
<books>
	<!-- ISBN:国际标准书号由13位数字组成。前三位数字代表图书，中间的9个数字分为三组，分别表示组号、出版社号和书序号，最后一个数字是校验码。 -->
	<book isbn="9787121025389">
		<name>JAVA面向对象编程</name>
		<author>孙卫琴</author>
		<publishing>电子工业出版社</publishing>
		<pubdate>2006-07-01</pubdate>
		<price>50.60</price>
	</book>
	<book isbn="9787111349662">
		<name>深入理解Java虚拟机：JVM高级特性与最佳实践</name>
		<author>周志明</author>
		<publishing>机械工业出版社</publishing>
		<pubdate>2011-07-01</pubdate>
		<price>46.20</price>
	</book>
</books>