Java XML parsing using DOM parser

Core java Interview Questions

Employees.xml:

Employee.java

1. package javaXMLParsing;
2. public class Employee {
3.     
4.     String id;
5.       String firstName;
6.       String lastName;
7.       String location;
8.      
9.       @Override
10.       public String toString() {
11.         return firstName+" "+lastName+"("+id+")"+location;
12.       }
13.  
14. }

Java Example program to parse XML using DOM parser:

DOMParserDemo.java

1. package javaXMLParsing;
2. import java.util.ArrayList;
3. import java.util.List;
4.  
5. import javax.xml.parsers.DocumentBuilder;
6. import javax.xml.parsers.DocumentBuilderFactory;
7.  
8. import org.w3c.dom.Document;
9. import org.w3c.dom.Element;
10. import org.w3c.dom.Node;
11. import org.w3c.dom.NodeList;
14.  
15. public class DOMParserDemo {
16.  
17.  public static void main(String[] args) throws Exception {
18.         //Create object of DOM Builder Factory  class By using
19.        //DocumentBuilderFactory.newInstance() method
20. 
    
21.         DocumentBuilderFactory factoryobj =
22.             DocumentBuilderFactory.newInstance();
23.      
24.         //Create DOM Builder Object from DocumentBuilderFactory object
25.         DocumentBuilder builder = factoryobj.newDocumentBuilder();
26.      
27.         //Load the XML document and parse it
28.        
29.         Document documentobj =
30.           builder.parse(
31.             ClassLoader.getSystemResourceAsStream("javaXMLParsing/Employee.xml"));
32.      
33.      
34.         List<Employee> empList = new ArrayList<>();
35.      
36.         //Iterating through the nodes and extracting the data.
37.         NodeList nodeList = documentobj.getDocumentElement().getChildNodes();
38.      
39.         for (int i = 0; i < nodeList.getLength(); i++) {
40.      
41.           //We have encountered an <employee> tag.
42.  
43.           Node node = nodeList.item(i);
44.           if (node instanceof Element) {
45.             Employee emp = new Employee();
46.             emp.id = node.getAttributes().
47.                 getNamedItem("id").getNodeValue();
48.      
49.    NodeList childNodes = node.getChildNodes();
50.    for (int j = 0; j < childNodes.getLength(); j++) {
51.        Node cNode = childNodes.item(j);
52.      
53.       //Identifying the child tag of employee every employee .
54.       if (cNode instanceof Element) {
55.        String content = cNode.getLastChild().
56.                     getTextContent().trim();
57.                 switch (cNode.getNodeName()) {
58.                   case "firstName":
59.                     emp.firstName = content;
60.                     break;
61.                   case "lastName":
62.                     emp.lastName = content;
63.                     break;
64.                   case "location":
65.                     emp.location = content;
66.                     break;
67.   }
68.   }
69.  }
70.             empList.add(emp);
71. }
72. 
    
73. }
74.      
75.        //Printing the Employee list by using for each loop.
76.  for (Employee emp : empList) {
77.           System.out.println(emp);
78.  }
79.      
80.  }
81.  
82. }

Output:

1. saidesh kilaru(001)Bangalore 
2. ajay chanukya(002)Chicago 
3. Vinod Gandrakoti(003)Hyderabad

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Java XML parsing using DOM parser

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