Parsing an XML document using DOM

Aim:

            To create simple DOM parser to parse XML document

Algorithm:

1. Get a document builder using document builder factory and parse the xml file to create a DOM object
2. Get a list of employee elements from the DOM
3. For each employee element get the id, name, age and type. Create an employee value object and add it to the list
4. At the end iterate through the list and print the employees to verify we parsed it right.

Program:

DomParserExample.java

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

public class DomParserExample {

//No generics

            List myEmpls;

            Document dom;

            public DomParserExample(){

                        //create a list to hold the employee objects

                        myEmpls = new ArrayList();

            }

            public void runExample() {

                       

                        //parse the xml file and get the dom object

                        parseXmlFile();

                       

                        //get each employee element and create a Employee object

                        parseDocument();

                       

                        //Iterate through the list and print the data

                        printData();

                       

            }

           

           

            private void parseXmlFile(){

                        //get the factory

                        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

                       

                        try {

                                   

                                    //Using factory get an instance of document builder

                                    DocumentBuilder db = dbf.newDocumentBuilder();

                                   

                                    //parse using builder to get DOM representation of the XML file

                                    dom = db.parse("employees.xml");

                                   

                        }catch(ParserConfigurationException pce) {

                                    pce.printStackTrace();

                        }catch(SAXException se) {

                                    se.printStackTrace();

                        }catch(IOException ioe) {

                                    ioe.printStackTrace();