Read XML file in java using DOM parser

DOM stands for Document Object Model, XML DOM defines a standard for accessing and manipulating documents. DOM parser parses the entire XML document and creates DOM objects in the memory in form of a Tree structure. You should use DOM parser in following scenarios:

• In case of small XML documents, or large number of small XML documents.
• In case you want to access whole XML.
• For editing the xml as it keeps the DOM structure in memory.

1) Read XML file and print node names and values

<?xml version="1.0"?>    
<employees>
    <employee id="123">
	<firstname>Mohit</firstname>
	<lastname>Bisht</lastname>
    </employee>
    <employee id="124">
        <firstname>Samit</firstname>
        <lastname>Ahlawat</lastname>
    </employee>
    <employee id="125">
        <firstname>Vikram</firstname>
        <lastname>Raheja</lastname>
    </employee>
</employees>
	

// Parses XML file using Java DOM parser and prints node names and values
import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
				
public class DOMXMLParser {
    public static void main(String[] args) {
        try {
            File inputFile = new File("C://employees.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = null;
            try {
                dBuilder = dbFactory.newDocumentBuilder();
            } catch (ParserConfigurationException e) {
                e.printStackTrace();
            }
			
            Document doc = dBuilder.parse(inputFile);
            doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getElementsByTagName("employee");
                
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                System.out.println("Current Element :" + node.getNodeName());
                
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    Element element = (Element) node;
                
                    System.out.println("Employee id: "  
                        + element.getAttribute("id"));
                    System.out.println("First Name : "
                        + element.getElementsByTagName("firstname")
                        .item(0).getTextContent());
                    System.out.println("Last Name : "
                        + element.getElementsByTagName("lastname")
                        .item(0).getTextContent());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } 

    }
}
	

Output :

Current Element :employee
Employee id: 123
First Name : Mohit
Last Name : Bisht
Current Element :employee
Employee id: 124
First Name : Samit
Last Name : Ahlawat
Current Element :employee
Employee id: 125
First Name : Vikram
Last Name : Raheja
    

2) Read XML file and print node attribute values

<?xml version="1.0"?>    
<employees>
    <employee id="123" department="accounts">
	<firstname>Mohit</firstname>
	<lastname>Bisht</lastname>
    </employee>
    <employee id="124" department="hr">
        <firstname>Samit</firstname>
        <lastname>Ahlawat</lastname>
    </employee>
</employees>
	

// Parses XML file using Java DOM parser and prints attribute values
import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;

				
public class DOMXMLParserReadAttributes {
    public static void main(String[] args) {
        try {
            File inputFile = new File("C://employees.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = null;
            try {
                dBuilder = dbFactory.newDocumentBuilder();
            } catch (ParserConfigurationException e) {
                e.printStackTrace();
            }
			
            Document doc = dBuilder.parse(inputFile);
            doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getElementsByTagName("employee");
                
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                System.out.println("Current Element :" + node.getNodeName());
                
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    NamedNodeMap nodeMap = node.getAttributes();
                
                for (int j = 0; j < nodeMap.getLength(); j++) {
                    	Node node2 = nodeMap.item(j);
                    	System.out.println("attribute name : " + node2.getNodeName());
                    	System.out.println("attribute value : " + node2.getNodeValue());
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } 

    }
}
	

Output :

Current Element :employee
attribute name : department
attribute value  : accounts
attribute name : id
attribute value  : 123
Current Element :employee
attribute name : department
attribute value  : hr
attribute name : id
attribute value  : 124