SAX解析XML

public class main {

	public static void main(String[] args) {
		
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			SAXParserHandler handler = new SAXParserHandler();
			parser.parse("books.xml", handler);
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public class SAXParserHandler extends DefaultHandler{
	
	String value = null;
	Book book = null;
	private ArrayList<Book> bookList = new ArrayList<Book>();
	public ArrayList<Book> getBookList() {
		return bookList;
	}

	int bookIndex = 0;
	/**
	 * 用来标识解析开始
	 */
	@Override
	public void startDocument() throws SAXException {
		// TODO Auto-generated method stub
		super.startDocument();
		System.out.println("SAX解析开始");
	}
	
	/**
	 * 用来标识解析结束
	 */
	@Override
	public void endDocument() throws SAXException {
		// TODO Auto-generated method stub
		super.endDocument();
		System.out.println("SAX解析结束");
	}
	
	/**
	 * 解析xml元素,Element
	 */
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		
		super.startElement(uri, localName, qName, attributes);
		if (qName.equals("book")) {
			//book element
			bookIndex++;
			//创建一个book对象
			book = new Book();
			//开始解析book元素的属性
			System.out.println("======================开始遍历某一本书的内容=================");
//			//已知book元素下属性的名称，根据属性名称获取属性值
//			String value = attributes.getValue("id");
//			System.out.println("book的属性值是：" + value);
			//不知道book元素下属性的名称以及个数，如何获取属性名以及属性值
			int num = attributes.getLength();
			for(int i = 0; i < num; i++){
				System.out.print("book元素的第" + (i + 1) +  "个属性名是："
						+ attributes.getQName(i));
				System.out.println("---属性值是：" + attributes.getValue(i));
				if (attributes.getQName(i).equals("id")) {
					book.setId(attributes.getValue(i));
				}
			}
		}
		else if (!qName.equals("name") && !qName.equals("bookstore")) {
			System.out.print("节点名是：" + qName + "---");
		}
	}
	
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		
		super.endElement(uri, localName, qName);
		//判断是否针对一本书已经遍历结束
		if (qName.equals("book")) {
			bookList.add(book);
			book = null;
			System.out.println("======================结束遍历某一本书的内容=================");
		}
		else if (qName.equals("name")) {
			book.setName(value);
		}
		else if (qName.equals("author")) {
			book.setAuthor(value);
		}
		else if (qName.equals("year")) {
			book.setYear(value);
		}
		else if (qName.equals("price")) {
			book.setPrice(value);
		}
		else if (qName.equals("language")) {
			book.setLanguage(value);
		}
	}
	
	/**
	 * Text节点的内容
	 */
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		// TODO Auto-generated method stub
		super.characters(ch, start, length);
		value = new String(ch, start, length);
		if (!value.trim().equals("")) {
			System.out.println("节点值是：" + value);
		}
		
	}
}