JAXB -- ITS VERY SIMPLE STEP BY STEP

JAXB - Converting XML to java object and vice versa.

Marshaling - java Object to XML
UnMarshalling - XML to Java Object

Steps :

1 ) 

package com.model;

import java.util.ArrayList;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "Students123")
public class Student {
@XmlElement(name = "age" ,required=true)
int age;
@XmlElement(name = "name" )
String name;

ArrayList<String> skill;

ArrayList<Skill> arrayListSk;
public ArrayList<Skill> getArrayListSk() {
return arrayListSk;
}

public void setArrayListSk(ArrayList<Skill> arrayListSk) {
this.arrayListSk = arrayListSk;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getName() {
return name;
}

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

public ArrayList<String> getSkill() {
return skill;
}

public void setSkill(ArrayList<String> skill) {
this.skill = skill;
}


}

2) Skill.java

package com.model;

public class Skill {

String skillName;

int skillId;

public int getSkillId() {

return skillId;

}

public void setSkillId(int skillId) {

this.skillId = skillId;

}

public String getSkillName() {

return skillName;

}

public void setSkillName(String skillName) {

this.skillName = skillName;

}

}

3)

JAXB Marshaling

package com;

import java.io.StringWriter;

import java.util.ArrayList;

import javax.xml.bind.JAXBContext;

import javax.xml.bind.JAXBException;

import javax.xml.bind.Marshaller;

import com.model.Skill;

import com.model.Student;

public class JAVA2XML {

public static void main(String[] args) throws JAXBException {

Student student = new Student();

student.setAge(77);

student.setName("kiran");

ArrayList<String > alPhone=new ArrayList<String>();

alPhone.add("111");

alPhone.add("222");

student.setSkill(alPhone);

Skill skill=new Skill();

skill.setSkillId(11);

skill.setSkillName("java");

Skill skill1=new Skill();

skill1.setSkillId(11111);

skill1.setSkillName("java11");

ArrayList<Skill> arrayListss=new ArrayList<Skill>();

arrayListss.add(skill);

arrayListss.add(skill1);

student.setArrayListSk(arrayListss);

// converting java object into XML

JAXBContext jaxbContext = JAXBContext.newInstance(Student.class);

Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

// output pretty printed

jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

StringWriter writer = new StringWriter();

jaxbMarshaller.marshal(student, writer);

System.out.println(writer.toString());

}

}

4) Try below code for unmarshaling by your own

               JAXBContext jaxbContext = JAXBContext.newInstance(User.class);

       Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();

       User user = (User) jaxbUnmarshaller.unmarshal(new StringReader(apiOutput));

        

//Verify the populated object

       System.out.println(user.getId());

       System.out.println(user.getFirstName());

       System.out.println(user.getLastName());

ANOTHER EXAMPLE

Consider the following JAXB class:

import javax.xml.bind.annotation.*;   @XmlRootElement public class Book {     @XmlElement   private String author;     @XmlElement   private String title; }

Unmarshalling:
To convert an XML string into an object of class Book:

public static Book unmarshal(final String xml) throws JAXBException {   return (Book) JAXBContext.newInstance(Book.class)                            .createUnmarshaller()                            .unmarshal(new StringReader(xml)); }

Marshalling:
To convert a Book object into an XML string:

public static String marshal(Book book) throws JAXBException {   final Marshaller m = JAXBContext.newInstance(Book.class)                                   .createMarshaller();   m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);   final StringWriter w = new StringWriter();   m.marshal(book, w);   return w.toString(); }