Fastest and optimized way to read the xml

Question

I have this below XML file

  Kiran
  Pai
  22
         


        

Answer 1

A Stax Example

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

public class ReadAndPrintXMLFile {


    public static void main(String argv []) {

        String inputFile = "c:/source/book.xml";

        try {
            // First create a new XMLInputFactory
            XMLInputFactory inputFactory = XMLInputFactory.newInstance();
            // Setup a new eventReader
            InputStream in = new FileInputStream(inputFile);
            XMLEventReader eventReader = inputFactory.createXMLEventReader(in);
            // Read the XML document

            while (eventReader.hasNext()) {
                XMLEvent event = eventReader.nextEvent();

                if (event.isStartElement()) {
                    StartElement startElement = event.asStartElement();

                    if (startElement.getName().getLocalPart().equals("first")) {

                        event = eventReader.nextEvent();

                        StringBuilder fName = new StringBuilder();

                        while (!event.isEndElement()) {
                            fName.append(event.asCharacters().getData());
                            event = eventReader.nextEvent();
                        }
                        System.out.println("First Name : " + fName);

                        event = eventReader.nextEvent();

                        continue;
                    }

                    if (startElement.getName().getLocalPart().equals("last")) {

                        event = eventReader.nextEvent();

                        StringBuilder lName = new StringBuilder();

                        while (!event.isEndElement()) {
                            lName.append(event.asCharacters().getData());
                            event = eventReader.nextEvent();
                        }
                        System.out.println("Last Name : " + lName);

                        event = eventReader.nextEvent();

                        continue;
                    }

                    if (startElement.getName().getLocalPart().equals("age")) {

                        event = eventReader.nextEvent();

                        StringBuilder age = new StringBuilder();

                        while (!event.isEndElement()) {
                            age.append(event.asCharacters().getData());
                            event = eventReader.nextEvent();
                        }
                        System.out.println("Age : " + age);

                        event = eventReader.nextEvent();

                        continue;
                    }

                }
            }
        } catch (FileNotFoundException e) {
            System.out.println("File not Found: " + inputFile);
        } catch (XMLStreamException e) {
            e.printStackTrace();
        }
    }

}

Output:

First Name : Kiran
Last Name : Pai
Age : 22
First Name : Bill
Last Name : Gates
Age : 46
First Name : Steve
Last Name : Jobs
Age : 40