关于XML小故事——解析

package com.zking.xmlanlysis.util;

import java.io.InputStream;

public class Demo2 {

	public static void main(String[] args) {
		//1)存放与根目录下，/代表获取src根目录的绝对路径
		InputStream is= Demo2.class.getResourceAsStream("/student.xml");
		System.out.println(is);
		//2)存放于同一类的包下，不加/代表同类名包下的相对路径
	    InputStream is1=Demo2.class.getResourceAsStream("demo.properties");
		System.out.println(is1);
		//3)存放与WEB-INF目录下
		//servlet生命周期：初始化（init）、服务处理（service）、销毁（destory）
		//public clss LoginServlet extends HttpServlet
		//dogGet
		//doPost
		//init()
		//this.getReourceAsStream("/WEB-INF/db.properties")
		//WebContent(根目录)
		//WEB-INF
		//META-INF
		

	}

}

package com.zking.xmlanlysis.util;

import java.io.InputStream;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class Demo3 {

	public static void main(String[] args) {
		try {
			//1.获取student.xml文件输入流
			InputStream is= Demo3.class.getResourceAsStream("/student.xml");
			//2.创建SAXReader对象
			SAXReader saxReader=new SAXReader();
			//3.获取文件输入流并转换成Document对象
			//document:包含元素节点、属性以及文本
			Document doc= saxReader.read(is);
			//4.循环遍历
			//1)selectNodes:获取多个节点，返回List
			//2)selectSingleNode:获取单个节点
			//3)xpath语法：/代表定位路径@获取属性
			List<Node> root= doc.selectNodes("students/student");
			for (Node node : root) {
				//5.将Node节点转换成元素节点Element（student）
				Element elem=(Element) node;
				//6.获取元素节点的属性
				String pid=elem.attributeValue("pid");
				System.out.println("pid="+pid);
				//7.获取student节点下的name
				Node nameNode= elem.selectSingleNode("name");
				System.out.println(nameNode.getText());
			}
			//简化:xpath语法
			//[@id="title-content"/span[1]
			Node node = doc.selectSingleNode("/students/student[@pid='p02']/name");
			System.out.println(node.getStringValue());
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

<?xml version="1.0" encoding="UTF-8"?>
<students>
	<student pid="p01">
		<name>张三</name>
	</student>
	<student pid="p02">
		<name>李四</name>
	</student>	
	<student pid="p03">
		<name>王五</name>
	</student>		
</students>