Dinesh on Java

By the help of UnMarshaller interface, we can unmarshal(read) the object into xml document.In this example, we are going to convert simple xml document into java object.

Let’s see the steps to convert XML document into java object.

1. Create POJO or bind the schema and generate the classes
2. Create the JAXBContext object
3. Create the Unmarshaller objects
4. Call the unmarshal method
5. Use getter methods of POJO to access the data

Unmarshaller example: Converting xml document into java object

Xml Document(employee.xml)

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<employee empid="1111">
    <address>
        <city>Noida</city>
        <locality>Sector-88</locality>
        <pin>201301</pin>
    </address>
    <address>
        <city>Kannauj</city>
        <locality>Kamala Nagar</locality>
        <pin>209724</pin>
    </address>
    <name>Dinesh Rajput</name>
    <salary>100000.0</salary>
</employee>

Employee.java

package com.doj.jaxb;

import java.util.List;

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

/**
 * @author Dinesh Rajput
 *
 */
@XmlRootElement
public class Employee {
 private int empid;  
    private String name;  
    private float salary;
    private List<Address> address;
 
    @XmlAttribute  
    public int getEmpid() {
  return empid;
 }
 public void setEmpid(int empid) {
  this.empid = empid;
 }
 @XmlElement  
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 @XmlElement  
 public float getSalary() {
  return salary;
 }
 public void setSalary(float salary) {
  this.salary = salary;
 }
 @XmlElement  
 public List<Address> getAddress() {
  return address;
 }
 public void setAddress(List<Address> address) {
  this.address = address;
 }
    
}

Address.java

package com.doj.jaxb;

/**
 * @author Dinesh Rajput
 *
 */
public class Address {
 private String locality;
 private String city;
 private int pin;
 
 public String getLocality() {
  return locality;
 }
 public void setLocality(String locality) {
  this.locality = locality;
 }
 public String getCity() {
  return city;
 }
 public void setCity(String city) {
  this.city = city;
 }
 public int getPin() {
  return pin;
 }
 public void setPin(int pin) {
  this.pin = pin;
 }
}

JaxbUnmarshalTest.java

package com.doj.jaxb;
import java.io.File;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

/**
 * @author Dinesh Rajput
 *
 */
public class JaxbUnmarshalTest {

 /**
  * @param args
  * @throws JAXBException 
  */
 public static void main(String[] args) throws JAXBException {
  File file = new File("employee.xml");  
        JAXBContext jaxbContext = JAXBContext.newInstance(Employee.class);  
   
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();  
        Employee emp = (Employee) jaxbUnmarshaller.unmarshal(file);  
          
        System.out.println("Employee-"+emp.getEmpid()+" | "+emp.getName()+" | "+emp.getSalary());  
        System.out.println("Addresses: ");  
        List<Address> list = emp.getAddress();  
        for(Address address : list){  
         System.out.println(address.getLocality()+" | "+address.getCity()+" | "+address.getPin());
        }
 }
}

Run this application you get following output-
Employee-1111 | Dinesh Rajput | 100000.0
Addresses:
Sector-88 | Noida | 201301
Kamala Nagar | Kannauj | 209724

Download Source Code
JaxBUnmarshalExample.zip