JAXB(Unmarshalling)

Introduction:

• JAXB stands for Java Architecture for XML Binding.
• Jaxb provides convert the object into XML and XML into the object.

Unmarshalling

• Unmarshalling means convert the XML into the object.

Steps to convert XML into the object

1. Create a POJO class.

2. Create a JAXB context object.

3. Create the unmarshalled object.

5. Call the unmarshaller method.

6. Use the getter methods to get the data.

Here is the POJO class

package com.JavaAnippets;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author Janardhan Randhi
 */
@XmlRootElement
public class Obj2Xml {

    private int id;
    private String FirstName;
    private String LastName;
    private float salary;
public Obj2Xml() {} 
    public Obj2Xml(int id, String FirstName, String LastName, float salary) {
        super();
        this.id = id;
        this.FirstName = FirstName;
        this.LastName = LastName;
        this.salary = salary;
    }

    @XmlAttribute
    public int getId() {
        return id;
    }

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

    @XmlElement
    public String getFirstName() {
        return FirstName;
    }

    public void setFirstName(String FirstName) {
        this.FirstName = FirstName;
    }

    @XmlElement
    public String getLastName() {
        return LastName;
    }

    public void setLastName(String LastName) {
        this.LastName = LastName;
    }

    @XmlElement
    public float getSalary() {
        return salary;
    }

    public void setSalary(float salary) {
        this.salary = salary;
    }
}

@XmlRootElement specifies the root element of the XML document.
@XmlAttribute specifies the attribute of the root element.
@XmlElement specifies the sub-element of the root element.

Here is the Main class

package com.JavaAnippets;

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

/**
 *
 * @author Janardhan Randhi
 */
public class Xml2Object {

    public static void main(String[] args) throws JAXBException {
        File file = new File("JavaSnippets.xml");
        JAXBContext jaxbContext = JAXBContext.newInstance(Obj2Xml.class);
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
        Obj2Xml obj = (Obj2Xml) jaxbUnmarshaller.unmarshal(file);
        System.out.println(obj.getId() + " " + obj.getFirstName() + " " + obj.getLastName() +" " + obj.getSalary());
    }
}

Output: