This post will show you how to parse content from an XML file and convert it to Java Object.

XML file

<Books>
    <Book>
        <Id>1</Id>
        <Name>Java Programming</Name>
        <Author>Andrew Programming</Author>
    </Book>
    <Book>
        <Id>2</Id>
        <Name>Python Programming</Name>
        <Author>Andrew Programming</Author>
    </Book>
</Books>

Book.java

package xmldemo;

public class Book {
    private String id;
    private String name;
    private String author;

    public Book() {
    }

    public Book(String id, String name, String author) {
        this.id = id;
        this.name = name;
        this.author = author;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    @Override
    public String toString() {
        return "Book{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                '}';
    }
}

Dom parse

package xmldemo;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class ReadFromXMLFile {
    public static void main(String[] args) throws Exception {
        ReadFromXMLFile instance = new ReadFromXMLFile();
        instance.read();
    }

    public void read() throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new File("Book.xml"));

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

        List<Book> bookList = new ArrayList<>();
        for (int i = 0; i < list.getLength(); i++) {
            Element node = (Element) list.item(i);
            String id = node.getElementsByTagName("Id").item(0).getFirstChild().getNodeValue();
            String name = node.getElementsByTagName("Name").item(0).getFirstChild().getNodeValue();
            String author = node.getElementsByTagName("Author").item(0).getFirstChild().getNodeValue();

            System.out.println("Id: " + id);
            System.out.println("Name: " + name);
            System.out.println("Author: " + author);

            Book book = new Book(id, name, author);
            bookList.add(book);
        }
        System.out.println();
        System.out.println(bookList);
    }
}

Output

Id: 1
Name: Java Programming
Author: Andrew Programming
Id: 2
Name: Python Programming
Author: Andrew Programming

[Book{id='1', name='Java Programming', author='Andrew Programming'}, Book{id='2', name='Python Programming', author='Andrew Programming'}]

Source Code

https://github.com/AndrewProgramming/LearnJavaByExample