Jackson: Change the field names in json serialization

By default, Jackson uses the property name while serializing the model object. You can customize the property name using @JsonProperty annotation.

@JsonProperty annotation is used to change the field names while serializing the model object to json.

public class Employee {

        

         @JsonProperty("EMPLOYEE_DD")

         private int id;

        

         @JsonProperty("EMPLOYEE_FIRST_NAME")

         private String firstName;

        

         @JsonProperty("EMPLOYEE_LAST_NAME")

         private String lastName;

        

         @JsonProperty("EMPLOYEE_HOBBIES")

         private List<String> hobbies = new ArrayList<>();

                  ....

                  ....

}

Find the below working application.

Employee.java

package com.sample.model;

import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({ "firstName", "lastName", "hobbies", "id" })
public class Employee {
 
 @JsonProperty("EMPLOYEE_DD")
 private int id;
 
 @JsonProperty("EMPLOYEE_FIRST_NAME")
 private String firstName;
 
 @JsonProperty("EMPLOYEE_LAST_NAME")
 private String lastName;
 
 @JsonProperty("EMPLOYEE_HOBBIES")
 private List<String> hobbies = new ArrayList<>();

 public int getId() {
  return id;
 }

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

 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 List<String> getHobbies() {
  return hobbies;
 }

 public void setHobbies(List<String> hobbies) {
  this.hobbies = hobbies;
 }

 @Override
 public String toString() {
  StringBuilder builder = new StringBuilder();
  builder.append("Employee [id=").append(id).append(", firstName=").append(firstName).append(", lastName=")
    .append(lastName).append(", hobbies=").append(hobbies).append("]");
  return builder.toString();
 }

}

App.java

package com.sample.app;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.sample.model.Employee;

public class App {

 public static void main(String args[]) throws JsonGenerationException, JsonMappingException, IOException {
  Employee emp = new Employee();

  emp.setFirstName("Hari Krishna");
  emp.setId(1);

  emp.getHobbies().add("Trekking");
  emp.getHobbies().add("Blogging");
  emp.getHobbies().add("Cooking");

  ObjectMapper mapper = new ObjectMapper();
  mapper.writeValue(System.out, emp);
 }
}

Output

{"EMPLOYEE_FIRST_NAME":"Hari Krishna","EMPLOYEE_HOBBIES":["Trekking","Blogging","Cooking"],"EMPLOYEE_DD":1}

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