初探XML

百度XML

 

XML:

1:注释，同HTML

2：标记 

3：元素

初探：

首先建立web工程，然后建立xml文件，起名为xmlDemo.xml

<?xml version="1.0" encoding="UTF-8"?>

<xml-body>

	<book>

		<name>Java开发</name>

		<author>刚哥</author>

	</book>

	<book>

		<name>C++开发</name>

		<author>虎哥</author>

	</book>

</xml-body>

　　

DOM的简单解析：

import java.io.File;

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.Node;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;



public class ReadXml {



	/**

	 * @param args

	 */

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		//获得XML文件目录

		File xmlFile = new File("WebRoot/xmlDemo.xml");

		//利用DOM解析我们就需要Document对象， 该对象有DocumentBuilder生成，获得DocumentBuilder

		DocumentBuilder builder = null;

		//DocumentBuilderFactory工厂产生builderFactory

		DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

		try {

			//利用builderFactory产生DocumentBuilder

			builder = builderFactory.newDocumentBuilder();

			try {

				//获得Document

				Document document = builder.parse(xmlFile);

				//利用Document解析XML...

				//解析XML的根元素

				Element root = document.getDocumentElement();

				

				NodeList childNodes = root.getChildNodes();

				for (int i = 0; i < childNodes.getLength(); ++i) {

					Node node = childNodes.item(i);

					if (node.getNodeName().equals("book")) {

						System.out.println("\r\n书籍信息:");

						NodeList nodeDetails = node.getChildNodes();

						for (int j = 0; j < nodeDetails.getLength(); ++j) {

							Node details = nodeDetails.item(j);

							if (details.getNodeName().equals("name")){

								System.out.println("书名：" + details.getTextContent());

							} else if (details.getNodeName().equals("author")) {

								System.out.println("作者：" + details.getTextContent());

							}

						}

					}

				}



			} catch (SAXException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			} catch (IOException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

		} catch (ParserConfigurationException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

	}

}





注意导包问题..

　　

 SAX的简单解析:

import java.io.File;

import java.io.IOException;



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 ReadXMLBySAX extends DefaultHandler{

	private String value;

	

	//覆盖characters方法， 该方法用来处理元素中的字符

	public void characters (char ch[], int start, int length)

    throws SAXException

	{

	    value = new String(ch, start, length);

	}

	//覆盖endElement方法，该方法用来处理元素中的字符

	public void endElement (String uri, String localName, String qName) throws SAXException { 

		if (qName.equals("name")) {

			System.out.println("书名" + value);

		} else if (qName.equals("author")) {

			System.out.println("作者" + value);

		}

		System.out.println();

    }

	//覆盖startElement方法，用来处理解析到元素的开始标签

	public void startElement (String uri, String localName,String qName, Attributes attributes) throws SAXException {

		if (qName.equals("book")) {

			System.out.println("书籍信息：");

		}

	}





	/**

	 * @param args

	 * @throws IOException 

	 */

	public static void main(String[] args) throws IOException {

		// TODO Auto-generated method stub

		File xmlFile = new File("WebRoot/xmlDemo.xml");

		SAXParserFactory parserFactory = SAXParserFactory.newInstance();

	    try {

			SAXParser parser = parserFactory.newSAXParser();

			parser.parse(xmlFile, new ReadXMLBySAX());

			

		} catch (ParserConfigurationException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (SAXException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

	}



}