用Dom和Sax对xml文件的解析

package day12.xml;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
 * 使用DOM解析xml文档。
 */
public class TestDOMBook {
    public static void main(String[] args) {
        // 1、得到DOM解析器的工厂实例
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {
            // 2、从DOM工厂获得DOM解析器
            DocumentBuilder db = dbf.newDocumentBuilder();
            // 3、解析XML文档，得到一个Document，即DOM树
            Document doc = db.parse("e:/book.xml");
            // 4、得到所有book节点列表信息
            NodeList petList = doc.getElementsByTagName("book");
            // 5、轮循书本信息
            System.out.println("XML文件中book的初始化信息：");
            for (int i = 0; i < petList.getLength(); i++) {
                // 得到book元素
                Element book = (Element) petList.item(i);
                // 得到book元素下的id属性的值
                String strId = book.getAttributeNode("id").getNodeValue();
                System.out.println("ID:" + strId);
                // 得到book下的title子元素节点下的子文本节点的值
                String strTitle = book.getElementsByTagName("title").item(0)
                        .getFirstChild().getNodeValue();
                // 得到book下的title子元素节点
                Element title = (Element) book.getElementsByTagName("title")
                        .item(0);
                // 得到title元素节点的tid属性节点的值
                String strTid = title.getAttributeNode("tid").getNodeValue();
                String strAuthor = book.getElementsByTagName("author").item(0)
                        .getFirstChild().getNodeValue();
                String strYear = book.getElementsByTagName("year").item(0)
                        .getFirstChild().getNodeValue();
                String strPrice = book.getElementsByTagName("price").item(0)
                        .getFirstChild().getNodeValue();
                System.out.println("标题：" + strTitle);
                System.out.println("标题ID：" + strTid);
                System.out.println("作者：" + strAuthor);
                System.out.println("出版日期：" + strYear);
                System.out.println("价格：" + strPrice);
            }
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package day12.xml;
import java.io.File;
import java.io.IOException;
import java.util.Stack;
import javax.xml.parsers.ParserConfigurationException;
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;
public class SAXparseXml extends DefaultHandler {
    private static SAXParserFactory saxParserFactory=null;
    private static SAXParser saxParser=null;
    private Stack<String> stack = new Stack<String>();
    public static void main(String[] args) throws IOException {
        File file = new File("E:"+File.separator+"Person.xml");
        //1. 创建 SAXParserFactory 的实例
        saxParserFactory = SAXParserFactory.newInstance();
        try {
            //2.创建 SAXParser 的实例
            saxParser= saxParserFactory.newSAXParser();
            //3.创建 SAXParserHandler类
            SAXparseXml handler= new SAXparseXml();
            //4.使用 parse()方法解析 XML文档
            saxParser.parse(file, handler);      
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }
    }
                                                                                                      
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        if (qName.equals("Name")) {
            System.out.print("Name:"+attributes.getValue("","value"));
        }else
            stack.push(qName);
    }
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
            if (!qName.equals("Name")) {
                stack.pop();
            }
    }
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
            String tmp=stack.peek();
            if (tmp.equals("Age")) {
                System.out.print("   age:"+new String(ch,start,length));
            }
            if (tmp.equals("Address")) {
                System.out.println("   address:"+new String(ch,start,length));
            }        
    }
}