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Accessing XML file from Java
Posted on: May 24, 2009 at 12:00 AM

In this example we have provided you a simple java example with the source code that will make it possible to access the XML file through Java.

Accessing XML file from Java

This section is going to tell you how to access a XML file using Java Code.

In this example we have provided you a simple java example with the source code that will make it possible to access the XML file through Java. For that we have used DOM parser. DOM parser that loads the XML file into the memory and makes an object model which can be traversed to get the file elements. For this, we have created two different files:
1) MyFile.xml
2) AccessingXmlFile.java

Source Code for accessing XML file through Java

File MyFile.xml

<?xml version="1.0"?>
<student>
<student-name>
<firstname>Anusmita</firstname>
<lastname>Singh</lastname>
</student-name>

<student-address>
<address>Rohini</address>
<city>Delhi</city>
</student-address>
</student>

Here is the code of AccessingXmlFile.java


import java.io.File;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.*;

      

public class AccessingXmlFile {

      

 public static void main(String argv[]) {

      

  try {

  File file = new File("C:\\MyFile.xml");

  DocumentBuilderFactory dbf = 

  DocumentBuilderFactory.newInstance();

  DocumentBuilder db = dbf.newDocumentBuilder();

  Document document = db.parse(file);

  document.getDocumentElement().normalize();

  System.out.println("Root element "+

  document.getDocumentElement().getNodeName());

  NodeList node = document.getElementsByTagName("student");

  System.out.println("Information of the students");

      

  for (int i = 0; i < node.getLength(); i++) {

  Node firstNode = node.item(i);

  

  if (firstNode.getNodeType() == Node.ELEMENT_NODE) {

  

  Element element = (Element) firstNode;

  NodeList firstNameElemntList = 

   element.getElementsByTagName("firstname");

  Element firstNameElement = (Element) firstNameElemntList.item(0);

  NodeList firstName = firstNameElement.getChildNodes();

  System.out.println("First Name:"+ 

  ((Node)firstName.item(0).getNodeValue());

  

  NodeList lastNameElementList = 

   element.getElementsByTagName("lastname");

  Element lastNameElement = (Element) 

   lastNameElementList.item(0);

  NodeList lastName = lastNameElement.getChildNodes();

  System.out.println("Last Name :"+

  ((Node)lastName.item(0).getNodeValue());

      

  NodeList addressList = element.getElementsByTagName("address");

  Element addressElement = (Element) addressList.item(0);

  NodeList address = addressElement.getChildNodes();

  System.out.println("Address : "  +

   ((Node) address.item(0)).getNodeValue());

      

  NodeList cityList = element.getElementsByTagName("city");

  Element cityElement = (Element) cityList.item(0);

  NodeList city = cityElement.getChildNodes();

  System.out.println("City : "  + 

   ((Node) city.item(0)).getNodeValue());

 }

}

  } catch (Exception e) {

  e.printStackTrace();

  }

 }

}

In the above example, the method DocumentBuilderFactory.newInstance() enables applications to obtain a parser that produces DOM. The DocumentBuilder provides the DOM document instances from XML document. The Document refers to the HTML or XML document. The getDocumentElement() method provides the XML root Element. The getElementsByTag Name() provides the tag. Then get the value of node by getNodeValue().

Following output will be displayed on the console:

Download Source Code:

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