分享非常有用的Java程序 (关键代码)(六)---解析/读取XML 文件（重要）

原文:分享非常有用的Java程序 (关键代码)(六)---解析/读取XML 文件（重要）

XML文件

<?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>

Java解析的代码：

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);

				}

			}

	public static void main(String[] args) {

		XMLParser parser = new XMLParser();

				}

			parser.getAllUserNames("c:\\test.xml");

		}

	}

}

巴特西

分享非常有用的Java程序 (关键代码)(六)---解析/读取XML 文件（重要）

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