How to read XML file in java.

We can read a xml by following stpes-

Step 1- Create File object of xml file.

1	fXmlFile = new File("src\\myXml.xml");

Step 2- Create a document and parse the xml and sotore it into document object

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DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); Document doc = dBuilder.parse(fXmlFile);

Step 3- Read a root element

1	doc.getDocumentElement().getNodeName()

Step 4- Find a node list

1	NodeList nList = doc.getElementsByTagName("staff");

Step 5- Make loop over this NodeList and read all the node one by one

1 2	eElement.getAttribute("id"); eElement.getElementsByTagName("firstname").item(0).getTextContent();

Example:

myXml.xml

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<?xml version="1.0"?> <company> <staff id="1001"> <firstname>Ram</firstname> <lastname>Singh</lastname> <nickname>ram</nickname> <salary>100000</salary> </staff> <staff id="2001"> <firstname>Shyam</firstname> <lastname>Singh</lastname> <nickname>shyam</nickname> <salary>200000</salary> </staff> </company>

ReadXMLFile.java

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package com. atozjavatutorials; 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("src\\myXml.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); System.out.println("\nCurrent Element :" + nNode.getNodeName()); if (nNode.getNodeType() == Node.ELEMENT_NODE) { Element eElement = (Element) nNode; System.out.println("Staff id : " + eElement.getAttribute("id")); System.out.println("First Name : " + eElement.getElementsByTagName("firstname").item(0).getTextContent()); System.out.println("Last Name : " + eElement.getElementsByTagName("lastname").item(0).getTextContent()); System.out.println("Nick Name : " + eElement.getElementsByTagName("nickname").item(0).getTextContent()); System.out.println("Salary : " + eElement.getElementsByTagName("salary").item(0).getTextContent()); } } } catch (Exception e) { e.printStackTrace(); } } }

Output:

Root element :company
----------------------------
Current Element :staff
Staff id : 1001
First Name : Ram
Last Name : Singh
Nick Name : ram
Salary : 100000
Current Element :staff
Staff id : 2001
First Name : Shyam
Last Name : Singh
Nick Name : shyam
Salary : 200000