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");
		}
	}
}

版权声明：本文为博主原创文章，未经博主允许不得转载。