Monday, June 13, 2011

How to Parse XML using Java

Step 2: Dom Parser
 
package org.best.example;
 
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
 
public class ReadXMLFile {
 
 public static void main(String argv[]) {
 
 try {
 
    File fXmlFile = new File("c:\\file.xml");
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
    Document doc = dBuilder.parse(fXmlFile);
    doc.getDocumentElement().normalize();
 
    System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
    NodeList nList = doc.getElementsByTagName("staff");
    System.out.println("-----------------------");
 
    for (int temp = 0; temp < nList.getLength(); temp++) {
 
       Node nNode = nList.item(temp);     
       if (nNode.getNodeType() == Node.ELEMENT_NODE) {
 
          Element eElement = (Element) nNode;
 
          System.out.println("First Name : "  + getTagValue("firstname",eElement));
          System.out.println("Last Name : "  + getTagValue("lastname",eElement));
          System.out.println("Nick Name : "  + getTagValue("nickname",eElement));
          System.out.println("Salary : "  + getTagValue("salary",eElement));
 
        }
    }
  } catch (Exception e) {
    e.printStackTrace();
  }
 }
 
 private static String getTagValue(String sTag, Element eElement){
    NodeList nlList= eElement.getElementsByTagName(sTag).item(0).getChildNodes();
    Node nValue = (Node) nlList.item(0); 
 
    return nValue.getNodeValue();    
 }
 
}

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