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Java中的两种XML解析技术DOM跟SAX

分类: IT文章 • 2023-03-24 13:10:59
Java中的两种XML解析技术DOM和SAX

Java中的两种XML解析技术DOM和SAX



目标文件：D:/meno.xml

<memo>
<note type="birthday">
	<name>王平</name>
	<sex>男</sex>
	<date>12月23日</date>
	<address>吉林省白山市第八中学</address>
	<telphone>0439-31344532</telphone>
	<email>wangping@sina.com</email>
	<body>今天是王平生日</body>
</note>
<note type="shop">
	<name>东方雪</name>
	<sex>女</sex>
	<date>8月23日</date>
	<address>北京海淀区中关村E世界</address>
	<telphone>15984561235</telphone>
	<email>eworld@vip.com</email>
	<body>今天是东方雪店铺开张的日子</body>
</note>
</memo>




DOM解析

步骤：

1.获取factory

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

2.获取builder

builder = builderFactory.newDocumentBuilder();

3.解析为Document对象

Document document = builder.parse(xmlFile); 

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DomTest {
	public static void main(String[] args) {
		File xmlFile = new File("D:\\memo.xml");
		DocumentBuilder builder = null;
		DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
		try {
			builder = builderFactory.newDocumentBuilder();
			Document document = builder.parse(xmlFile);		//解析文件
			Element root = document.getDocumentElement();	//获得根元素
			System.out.println("根元素：" + root.getNodeName());
			NodeList childNodes = root.getChildNodes();		//获得根元素下的子节点
			for (int i = 0; i < childNodes.getLength(); i++) {	//遍历这些子节点
				Node node = childNodes.item(i);
				if("note".equals(node.getNodeName())) {
					//如果节点的名称为"node",则输出note元素属性type
					System.out.println("\r\n 找到一篇日记。所属分类：" + node.getAttributes().getNamedItem("type").getNodeValue()+".");
					NodeList nodeDetail = node.getChildNodes();
					for(int j = 0; j < nodeDetail.getLength(); j++) 
					{
						Node detail = nodeDetail.item(j);
						if("name".equals(detail.getNodeName()))
							System.out.println("姓名: " + detail.getTextContent());
						else if("sex".equals(detail.getNodeName()))
							System.out.println("性别：" + detail.getTextContent());
						else if("date".equals(detail.getNodeName())) 
							System.out.println("日期：" + detail.getTextContent());
						else if("address：".equals(detail.getNodeName()))
							System.out.println("居住地址：" + detail.getTextContent());
						else if("telephone".equals(detail.getNodeName()))
							System.out.println("电话号码：" + detail.getTextContent());
						else if("email".equals(detail.getNodeName()))
							System.out.println("E-mail: " + detail.getTextContent());
						else if("body".equals(detail.getNodeName()))
							System.out.println("主题：" + detail.getTextContent());
							
					}
				}
				
			}
			
		}
		catch(Exception e) {
			e.printStackTrace();
		}
	}
}

SAX解析

步骤：

1.获取factory

SAXParserFactory factory = SAXParserFactory.newInstance();

2.获取parser

SAXParser parser = factory.newSAXParser();

3.开始解析

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


import java.io.File;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

public class SaxTest {
	public static void main(String[] args) {
		File xmlFile = new File("D:\\memo.xml");
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			parser.parse(xmlFile,new MySaxListener());
			
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
}


import org.xml.sax.helpers.DefaultHandler;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class MySaxListener extends DefaultHandler {
	private String content;
	
	public void characters(char[] ch, int start, int length) throws SAXException {
		content = new String(ch, start, length);
	}
	
	public void endElement(String uri, String localName, String qName) throws SAXException {	
		if("name".equals(qName)) {
			System.out.println("姓名：" + content);
		} else if("sex".equals(qName)) {
			System.out.println("性别：" + content);
		}else if("date".equals(qName)) {
			System.out.println("日期：" + content);
		}else if("address".equals(qName)) {
			System.out.println("居住地址：" + content);
		}else if("telephone".equals(qName)) {
			System.out.println("电话号码:" + content);
		}else if("email".equals(qName)) {
			System.out.println("电子邮件：" + content);
		}else if("body".equals(qName)) {
			System.out.println("主题：" + content);
		}
	}
	
	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
		if("note".equals(qName)) {
			System.out.println("下面是一个关于SAX的解析方式：");
			System.out.println("\r\n找到一篇文章.所属分类：" + attributes.getValue("type") + ".");
		}
	}
}


解析结果

Java中的两种XML解析技术DOM跟SAX





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