public static void main(String[] args) throws Exception {
		// 1.获取解析器工厂
		SAXParserFactory factory = SAXParserFactory.newInstance();
		// 2.通过工厂获取sax解析器
		SAXParser parser = factory.newSAXParser();
		// 3.获取读取器
		XMLReader reader = parser.getXMLReader();
		// 4.注册事件处理器
		// reader.setContentHandler(new MyContentHandler());
		reader.setContentHandler(new MyContentAdapter());
		// 5.解析xml
		reader.parse("book.xml");
	}

// 适配器设计模式 （父类空实现 接口中抽象方法，相对比MyContentHandler 类）
class MyContentAdapter extends DefaultHandler {

	private String eleName = null;
	private int count = 0;

	@Override
	public void startElement(String uri,String localName,String name,Attributes attributes) throws SAXException {
		this.eleName = name;
	}

	@Override
	public void characters(char[] ch,int start,int length)
			throws SAXException {
		if ("书名".equals(eleName) && ++count == 2) {
			System.out.println(new String(ch,start,length));
		}
	}

	@Override
	public void endElement(String uri,String name)
			throws SAXException {
		eleName = null;
	}
}




class MyContentHandler implements ContentHandler {
	public void startDocument() throws SAXException {
		System.out.println("文档解析开始了.......");
	}

	public void startElement(String uri,Attributes atts) throws SAXException {
		System.out.println("发现了开始标签," + name);
	}

	public void characters(char[] ch,int length)
			throws SAXException {
		System.out.println(new String(ch,length));
	}

	public void endElement(String uri,String name)
			throws SAXException {
		System.out.println("发现结束标签," + name);
	}

	public void endDocument() throws SAXException {
		System.out.println("文档解析结束了.......");
	}
	
	
	
	
	
	

	public void endPrefixMapping(String prefix) throws SAXException {
		// TODO Auto-generated method stub

	}

	public void ignorableWhitespace(char[] ch,int length)
			throws SAXException {
		// TODO Auto-generated method stub

	}

	public void processingInstruction(String target,String data)
			throws SAXException {
		// TODO Auto-generated method stub

	}

	public void setDocumentLocator(Locator locator) {
		// TODO Auto-generated method stub

	}

	public void skippedEntity(String name) throws SAXException {
		// TODO Auto-generated method stub

	}

	public void startPrefixMapping(String prefix,String uri)
			throws SAXException {
		// TODO Auto-generated method stub

	}

}