Serialize and DeSerialize Nested Objects in JAXB

Entities Class

Create new package named entities. In this package, create new java classes as below:

Student Entity

package entities;

import java.io.Serializable;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "student")
public class Student implements Serializable {

	private String id;
	private String name;
	private int age;
	private double score;
	private Address address;

	public String getId() {
		return id;
	}

	@XmlElement(name = "id")
	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	@XmlElement(name = "age")
	public void setAge(int age) {
		this.age = age;
	}

	public double getScore() {
		return score;
	}

	@XmlElement(name = "score")
	public void setScore(double score) {
		this.score = score;
	}

	@XmlElement(name = "address")
	public Address getAddress() {
		return address;
	}

	public void setAddress(Address address) {
		this.address = address;
	}

	/* Declare address tag */
	@XmlRootElement(name = "address")
	public static class Address implements Serializable {

		private String street;
		private String ward;
		private String district;
		private String country;

		public String getStreet() {
			return street;
		}

		@XmlElement
		public void setStreet(String street) {
			this.street = street;
		}

		public String getWard() {
			return ward;
		}

		@XmlElement
		public void setWard(String ward) {
			this.ward = ward;
		}

		public String getDistrict() {
			return district;
		}

		@XmlElement
		public void setDistrict(String district) {
			this.district = district;
		}

		public String getCountry() {
			return country;
		}

		@XmlElement
		public void setCountry(String country) {
			this.country = country;
		}

		public Address() {
		}

		public Address(String street, String ward, String district, String country) {
			this.street = street;
			this.ward = ward;
			this.district = district;
			this.country = country;
		}

	}

}

Run Application

Create new package, named demo. In this package, create new java class, named Main as below

package demo;

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import entities.Student;

public class Main {

	private static void serialize(Student student, String xmlFile) {
		try {
			JAXBContext jaxbContext = JAXBContext.newInstance(Student.class);
			Marshaller marshaller = jaxbContext.createMarshaller();
			marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
			// Display result to console
			marshaller.marshal(student, System.out);
			// Save result to xml file
			marshaller.marshal(student, new File(xmlFile));
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	private static void deSerialize(String xmlFile) {
		try {
			JAXBContext jaxbContext = JAXBContext.newInstance(Student.class);
			Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
			Student student = (Student) unmarshaller.unmarshal(new File(xmlFile));
			System.out.println("Student Info");
			System.out.println("Id: " + student.getId());
			System.out.println("Name: " + student.getName());
			System.out.println("Age: " + student.getAge());
			System.out.println("Score: " + student.getScore());
			System.out.println("Address Information");
			System.out.println("\tStreet: " + student.getAddress().getStreet());
			System.out.println("\tWard: " + student.getAddress().getWard());
			System.out.println("\tDistrict: " + student.getAddress().getDistrict());
			System.out.println("\tCountry: " + student.getAddress().getCountry());
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	public static void main(String[] args) {

		String xmlFile = "src\\data\\student.xml";
		Student student = new Student();
		student.setId("st01");
		student.setName("name 1");
		student.setAge(22);
		student.setScore(7.8);
		student.setAddress(new Student.Address("street 1", "ward 1", "district 1", "country 1"));
		serialize(student, xmlFile);
		deSerialize(xmlFile);

	}

}

Output

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<student>
    <address>
        <country>country 1</country>
        <district>district 1</district>
        <street>street 1</street>
        <ward>ward 1</ward>
    </address>
    <age>22</age>
    <id>st01</id>
    <name>name 1</name>
    <score>7.8</score>
</student>

Student Info
Id: st01
Name: name 1
Age: 22
Score: 7.8
Address Information
	Street: street 1
	Ward: ward 1
	District: district 1
	Country: country 1