How To Create POJO Classes Of A JSON Object Payload

Example Json Object:

{
“firstName”: “Phani”,
“lastName”: “Nagula”,
“gender”: “Male”,
“age”: 45,
“salary”: 50000,
“married”: true
}

public class Employee {
 
	// private variables or data members of pojo class
	private String firstName;
	private String lastName;
	private String gender;
	private int age;
	private double salary;
	private boolean married; 


        // Getter and setter methods
	public String getFirstName() {
		return firstName;
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public double getSalary() {
		return salary;
	}
	public void setSalary(double salary) {
		this.salary = salary;
	}
	public boolean getMarried() {
		return married;
	}
	public void setMarried(boolean married) {
		this.married = married;
	} 
}

We have created a POJO class of employee JSON.
Using above POJO class you can create any number of custom Employee objects and each object can be converted in to a JSON Object and Each JSON object can be parsed in to Employee POJO. If you have an API which requires dynamic payload of Employee then you can easily create as many as required employee payloads with different data in stead of creating hard coded JSON objects. In simple words POJO gives you flexibility of creating and manipulating data in simple ways.

We will create a JSON object form POJO and vice versa now which is generally called as serialization and deserialization using Jackson APIs.
serialization – Convert Employee class object to JSON representation or Object
deserialization – reverse of serializing . Convert a JSON Object to Employee class object

package RestAssuredPojo;
 
import org.testng.annotations.Test;
 
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
 
public class EmployeeSerializationDeserialization {
 
	@Test
	public void createEmployeeJSONFromEmployeePOJOClass() throws JsonProcessingException
	{
		// Just create an object of Pojo class
		Employee employee = new Employee();
		// Set value as you wish
		employee.setFirstName("Phani");
		employee.setLastName("Nagula");
		employee.setAge(45);
		employee.setGender("Male");
		employee.setSalary(50000);
		employee.setMarried(true);
		
		// Converting a Java class object to a JSON payload as string
		ObjectMapper objectMapper = new ObjectMapper();
		String employeeJson = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(employee);
		System.out.println(employeeJson);
	}

@Test
	public void getPojoFromEmployeeObject() throws JsonProcessingException
	{
		// Just create an object of Pojo class
		Employee employee = new Employee();
		// Set value as you wish
		employee.setFirstName("Phani");
		employee.setLastName("Nagula");
		employee.setAge(45);
		employee.setGender("Male");
		employee.setSalary(50000);
		employee.setMarried(true);
		
		// Converting a Java class object to a JSON payload as string
		ObjectMapper objectMapper = new ObjectMapper();
		String employeeJson = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(employee);
		
		
		// Converting Employee json string to Employee class object
		Employee employee2 = objectMapper.readValue(employeeJson, Employee.class);
		System.out.println("First Name of employee : "+employee2.getFirstName());
		System.out.println("Last Name of employee : "+employee2.getLastName());
		System.out.println("Age of employee : "+employee2.getAge());
		System.out.println("Gender of employee : "+employee2.getGender());
		System.out.println("Salary of employee : "+employee2.getSalary());
		System.out.println("Marital status of employee : "+employee2.getMarried());
	}
}