How to Parse XML file in Java

In this tutorial, we are going to learn about the Parsing XML file in Java.

We can Parse XML file using Java DOM parser and Java SAX parser.

We will learn about the DOM parser.

Java DOM Parser

DOM parser parses the whole XML file and creates a DOM object within the memory. It models an XML enters a tree structure for straightforward traversal and manipulation. In DOM everything in an XML file may be a node. The node represents a component of an XML file.

The XML file is as follow:-

<?xml version="1.0"?>  
<class>  
    <Employee>  
        <id>1</id>  
        <firstname>Rohit</firstname>  
        <lastname>Rajawat</lastname>  
        <salary>50K</salary>  
        
    </Employee>  
      
    <Employee>  
        <id>2</id>  
        <firstname>Sachin</firstname>  
        <lastname>Tehere</lastname>  
        <salary>80K</salary>  
        
    </Employee>    
  
     <Employee>  
        <id>3</id>  
        <firstname>Sanjay</firstname>  
        <lastname>Patel</lastname>  
        <salary>100K</salary>  
        
    </Employee>  
  
 
  
</class>

The Example java code to parse the XML file is as follows:

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 FXML
{
public static void main(String argv[])
{
try
{

File F = new File("MYFile.xml");
//an instance of factory that gives a document builder
DocumentBuilderFactory D = DocumentBuilderFactory.newInstance();
//an instance of builder to parse the specified xml file
DocumentBuilder Dbulid = D.newDocumentBuilder();
Document DoC = Dbulid.parse(F);
DoC.getDocumentElement().normalize();
System.out.println("Root element: " + DoC.getDocumentElement().getNodeName());
NodeList NL = DoC.getElementsByTagName("employee");

for (int i = 0; i < NL.getLength(); i++)
{
Node NoD = NL.item(i);
System.out.println("\nNode Name :" + NoD.getNodeName());
if (NoD.getNodeType() == Node.ELEMENT_NODE)
{
Element E = (Element) NoD;
System.out.println("Employee id: "+ E.getElementsByTagName("id").item(0).getTextContent());
System.out.println("First Name: "+ E.getElementsByTagName("firstname").item(0).getTextContent());
System.out.println("Last Name: "+ E.getElementsByTagName("lastname").item(0).getTextContent());
System.out.println("salary: "+ E.getElementsByTagName("salary").item(0).getTextContent());
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}

OUTPUT:-

Root element: class

Node Name: employee

employee id: 1
First Name: Rohit
Last Name: Rajawat
salary: 50K

Node Name: employee

employee id: 2
First Name: Sachin
Last Name: Tehere
salary: 80K

Node Name: employee

employee id: 3
First Name: Sanjay
Last Name: Patel
salary: 100K