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【Java】分析和读取xml文件

作者:首君 / 发布于2015/9/14/ 441


	xml文件
	view sourceprint?
	<?xml version="1.0"?>
	<students>
	 <student>
	 <name>John</name>
	 <grade>B</grade>
	 <age>12</age>
	 </student>
	 <student>
	 <name>Mary</name>
	 <grade>A</grade>
	 <age>11</age>
	 </student>
	 <student>
	 <name>Simon</name>
	 <grade>A</grade>
	 <age>18</age>
	 </student>
	</students>

	

	

	package net.viralpatel.java.xmlparser;
	
	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 XMLParser {
	
	 public void getAllUserNames(String fileName) {
	 try {
	 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	 DocumentBuilder db = dbf.newDocumentBuilder();
	 File file = new File(fileName);
	 if (file.exists()) {
	 Document doc = db.parse(file);
	 Element docEle = doc.getDocumentElement();
	
	 // Print root element of the document
	 System.out.println("Root element of the document: "
	 + docEle.getNodeName());
	
	 NodeList studentList = docEle.getElementsByTagName("student");
	
	 // Print total student elements in document
	 System.out
	 .println("Total students: " + studentList.getLength());
	
	 if (studentList != null && studentList.getLength() > 0) {
	 for (int i = 0; i < studentList.getLength(); i++) {
	
	 Node node = studentList.item(i);
	
	 if (node.getNodeType() == Node.ELEMENT_NODE) {
	
	 System.out
	 .println("=====================");
	
	 Element e = (Element) node;
	 NodeList nodeList = e.getElementsByTagName("name");
	 System.out.println("Name: "
	 + nodeList.item(0).getChildNodes().item(0)
	 .getNodeValue());
	
	 nodeList = e.getElementsByTagName("grade");
	 System.out.println("Grade: "
	 + nodeList.item(0).getChildNodes().item(0)
	 .getNodeValue());
	
	 nodeList = e.getElementsByTagName("age");
	 System.out.println("Age: "
	 + nodeList.item(0).getChildNodes().item(0)
	 .getNodeValue());
	 }
	 }
	 } else {
	 System.exit(1);
	 }
	 }
	 } catch (Exception e) {
	 System.out.println(e);
	 }
	 }
	 // http://www.sharejs.com
	 public static void main(String[] args) {
	
	 XMLParser parser = new XMLParser();
	 parser.getAllUserNames("c:\\test.xml");
	 }
	}

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