1. WaysInJavaToParseXML
Prof: Dr. Shu-Ching Chen
TA: Sheng Guan

2. Parse XML
Purpose :
populating the XML content into objects and then adding the objects to a list.

3. Sample XML <employees> <employee id="111">
<firstName>Rakesh</firstName>
<lastName>Mishra</lastName>
<location>Bangalore</location>
</employee>
<employee id="112">
<firstName>John</firstName>
<lastName>Davis</lastName>
<location>Chennai</location>
<employee id="113">
………………………………………………….

4. Using DOM Parser (1)
The DOM Parser loads the complete XML content into a Tree structure.
We iterate through the Node and NodeList to get the content of the XML.

5. Using DOM Parser (2) public class DOMParserDemo {
public static void main(String[] args) throws Exception {
//Get the DOM Builder Factory
DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
//Get the DOM Builder
DocumentBuilder builder = factory.newDocumentBuilder();

6. Using DOM Parser (3) //Load and Parse the XML document
//document contains the complete XML as a Tree.
Document document =
builder.parse(
ClassLoader.getSystemResourceAsStream("xml/empl oyee.xml"));
List<Employee> empList = new ArrayList<>();
//Iterating through the nodes and extracting the data.

7. Using DOM Parser (4)
NodeList nodeList = document.getDocumentElement().getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
//We have encountered an <employee> tag.
Node node = nodeList.item(i);
if (node instanceof Element) {
Employee emp = new Employee();
emp.id = node.getAttributes().
getNamedItem("id").getNodeValue();

8. Using DOM Parser (5) NodeList childNodes = node.getChildNodes();
for (int j = 0; j < childNodes.getLength(); j++) {
Node cNode = childNodes.item(j);
//Identifying the child tag of employee encountered.
if (cNode instanceof Element) {
String content = cNode.getLastChild().
getTextContent().trim();
switch (cNode.getNodeName()) {

9. Using DOM Parser (6) case "firstName": emp.firstName = content; break;
case "lastName":
emp.lastName = content;
case "location":
emp.location = content; }

10. Using DOM Parser (7) } empList.add(emp);
//Printing the Employee list populated.
for (Employee emp : empList) {
System.out.println(emp);

11. Using DOM Parser (8) } class Employee{ String id; String firstName;
String lastName;
String location;
@Override
public String toString() {
return firstName+" "+lastName+"("+id+")"+location;

12. Using DOM Parser (9) } The output for the above will be:
Rakesh Mishra(111)Bangalore
John Davis(112)Chennai
Rajesh Sharma(113)Pune

13. Other main parsers SAX Parser StAX Parser
You can find sample codes in reference link !!!

14. Reference
using-dom-sax-and-stax-parser-in-java/
Drafting out the sample input forms, queries and reports, often helps.