How to Parse XML using Java

Step 2- SAX Parser XML is Same

package org.best.example;
 
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
 
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
 
public class ReadXMLFileSAX {
 
 public static void main(String argv[]) {
 
  try {
 
     SAXParserFactory factory = SAXParserFactory.newInstance();
     SAXParser saxParser = factory.newSAXParser();
 
     DefaultHandler handler = new DefaultHandler() {
 
     boolean bfname = false;
     boolean blname = false;
     boolean bnname = false;
     boolean bsalary = false;
 
     public void startElement(String uri, String localName,
        String qName, Attributes attributes)
        throws SAXException {
 
        System.out.println("Start Element :" + qName);
 
        if (qName.equalsIgnoreCase("FIRSTNAME")) {
           bfname = true;
        }
 
        if (qName.equalsIgnoreCase("LASTNAME")) {
           blname = true;
        }
 
        if (qName.equalsIgnoreCase("NICKNAME")) {
           bnname = true;
        }
 
        if (qName.equalsIgnoreCase("SALARY")) {
           bsalary = true;
        }
 
     }
 
     public void endElement(String uri, String localName,
          String qName)
          throws SAXException {
 
          System.out.println("End Element :" + qName);
 
     }
 
     public void characters(char ch[], int start, int length)
         throws SAXException {
 
         if (bfname) {
            System.out.println("First Name : "
                + new String(ch, start, length));
            bfname = false;
          }
 
          if (blname) {
              System.out.println("Last Name : "
                  + new String(ch, start, length));
              blname = false;
           }
 
          if (bnname) {
              System.out.println("Nick Name : "
                  + new String(ch, start, length));
              bnname = false;
           }
 
          if (bsalary) {
              System.out.println("Salary : "
                  + new String(ch, start, length));
              bsalary = false;
           }
 
        }
 
      };
 
      saxParser.parse("c:\\file.xml", handler);
 
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
 
}

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();    
 }
 
}

How to Parse XML using Java

Step1:- Parsing XML

if you are a beginner to XML using Java then this is the perfect sample to parse a XML file create Java Objects and manipulate them.

The idea here is to parse the staff.xml file with content as below

<?xml version="1.0"?>
<company>
 <staff>
  <firstname>Amit</firstname>
  <lastname>Mangal</lastname>
  <nickname>Tiger</nickname>
  <salary>100000</salary>
 </staff>
 <staff>
  <firstname>Lalit</firstname>
  <lastname>Aggarwal</lastname>
  <nickname>Lalit</nickname>
  <salary>200000</salary>
 </staff>
</company>

From the parsed content create a list of Staff objects and print it to the console. The output would be something like

Root element :company
-----------------------
First Name : Amit
Last Name : Mangal

Nick Name : Tiger

Salary : 100000
First Name : Lalit
Last Name : Aggarwal
Nick Name : Lalit
Salary : 200000

We will start with a DOM parser to parse the xml file, create Employee value objects and add them to a list. To ensure we parsed the file correctly let's iterate through the list and print the employees data to the console.