JAX-B UnMarshalling: XML document into Java Objects

JAX-B API provides javax.xml.bind.Unmarshaller interface, It is used to un marshal(read) the xml document into Java Objects. In this example, we are going to discuss about how to read contents from xml into java objects using JAX-B.
Steps to convert java object into XML document.

• Create POJO or bind the schema and generate the classes.
• Create the JAXBContext object.
• Create the UnMarshaller objects.
• Call the unmarshal method
• Use getter methods of POJO to access the data

XMLDocument:Employee.xml

    25
    IT
    Jhon klazck

Create Employee POJO class
SOURCE:Employee.java

package com.becbe.jaxb.ch1;

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

@XmlRootElement
public class Employee {
 private int employeeId;
 private String employeeName;
 private int age;
 private String dept;
 /**
  * @return the employeeId
  */
 @XmlAttribute
 public int getEmployeeId() {
  return employeeId;
 }
 /**
  * @param employeeId the employeeId to set
  */
 public void setEmployeeId(int employeeId) {
  this.employeeId = employeeId;
 }
 /**
  * @return the employeeName
  */
 @XmlElement
 public String getEmployeeName() {
  return employeeName;
 }
 /**
  * @param employeeName the employeeName to set
  */
 public void setEmployeeName(String employeeName) {
  this.employeeName = employeeName;
 }
 /**
  * @return the age
  */
 @XmlElement
 public int getAge() {
  return age;
 }
 /**
  * @param age the age to set
  */
 public void setAge(int age) {
  this.age = age;
 }
 /**
  * @return the dept
  */
 @XmlElement
 public String getDept() {
  return dept;
 }
 /**
  * @param dept the dept to set
  */
 public void setDept(String dept) {
  this.dept = dept;
 }

}

SOURCE:XmlToObject.java

/**
 * 
 */
package com.becbe.jaxb.ch1;

import java.io.File;

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

/**
 * @author BECBE
 *
 */
public class XmlToObject {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  try {
   File xmlDocFile = new File("d:\\Employee.xml");
   //Create JAX-B instance
   JAXBContext jaxbContext = JAXBContext.newInstance(Employee.class);
   //Create UnMarshaller Instance
   Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
   //Un  marshalling the xml document to Employee pojo
   Employee employee=(Employee) unmarshaller.unmarshal(xmlDocFile);
   System.out.println("Name : "+employee.getEmployeeName());
   System.out.println("Id : "+employee.getEmployeeId());
   System.out.println("Age : "+employee.getAge());
   System.out.println("Department : "+employee.getDept());
   
  } catch (JAXBException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

}

OUTPUT:

Name : Jhon klazck
Id : 23456
Age : 25
Department : IT

<<-- prev

SHARE

Onlinecodegeek