How to read XML file in Java using DOM Parser?



  Steps:


1) Parse XML file or Create an instance of Document interface present in org.w3c.dom.* package.

For Creating an instance of Document interface we need to use DocumentBuilderFactory, DocumentBuilder classes present in javax.xml.parsers.* package and File class present in java.io.* package.

File file = new File(XML_file_location);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(file);

Read XML file Using DOM Parser
Figure 1

2) Get the root element of XML file. It returns Employees node.

String rootNode = document.getDocumentElement().getNodeName();

3) Get all the child nodes Employee of root node Employees. It returns the instance of NodeList interface present in org.w3c.dom.* package.

NodeList list = document.getElementsByTagName("Employee");

4) Now one by one examine each child node Employee and extract its data.

  • From all the child nodes that we got in Step 3 take one child node. It returns instance of Node interface present in org.w3c.dom.* package.
          Node node = list.item(i);
  • Check whether this node is Element node or not?
          if (node.getNodeType() == Node.ELEMENT_NODE) { }
  • If it is an Element node then typecast it and get its data (attributes and properties).
          Element element = (Element) node;
  • Get attribute value as below.
          String value=element.getAttribute(attribute_name);
  • Get property value as below.
           String value = element.getElementsByTagName(property_name).item(0).getTextContent();


Software Required:

  1. Java
  2. Eclipse
  3. Maven
Note : I suggest to use latest version of all the software. If you need any help regarding these software installation please comment below I will help you.

Project Structure:


Java XML DOM Parser Project Structure Part2
Figure 2

Java Code:


employee.xml


<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Employees>
<Employee id="1">
<name>Rohit</name>
<gender>male</gender>
<age>25</age>
<role>Programmer</role>
</Employee>
<Employee id="2">
<name>Bhavna</name>
<gender>female</gender>
<age>20</age>
<role>Student</role>
</Employee>
</Employees>


pom.xml


Employee.java


ReadXML.java


Output:


Java XML DOM Parser Output Part2
Figure 3

Download Project


Click here for more questions on DOM Parser.

References:


https://docs.oracle.com/javase/7/docs/api/javax/xml/parsers/DocumentBuilderFactory.html
https://docs.oracle.com/javase/7/docs/api/javax/xml/parsers/DocumentBuilder.html
https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/Document.html
https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/NodeList.html
https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/Node.html
https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/Element.html

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

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How to read XML file in Java using DOM Parser? How to read XML file in Java using DOM Parser? Reviewed by Unknown on 9/29/2017 Rating: 5

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