How to rename JSON properties using Jackson annotations?

JsonIgnore Property Example :

• In this example you will know how to ignore json property using @JsonIgnore jackson annotation.

• If you annotate any property with @JsonIgnore annotation, it will be ignored at runtime.

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package com.coding.Json;

import java.io.File;

import java.io.IOException;

import com.fasterxml.jackson.annotation.JsonIgnore;

import com.fasterxml.jackson.annotation.JsonProperty;

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonIgnoreExample {

public static void main(String[] args) {

// TODO Auto-generated method stub

ObjectMapper mapper = new ObjectMapper();

        try {

            // reading json input from the file and mapping to object

            File jsonInputFile = new File("D:\\Employee.txt");

            Employee emp = mapper.readValue(jsonInputFile, Employee.class);

            System.out.println(emp);

            // converting object to string value

            String jsonStr 

                    = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(emp);

            System.out.println(jsonStr);

             

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}

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class Employee {

@JsonProperty("emp_id")

private int empId;

@JsonProperty("emp_name")

private String name;

@JsonProperty("emp_designation")

private String designation;

private String department;

@JsonIgnore

private int salary; // salary ignored

public String toString() {

StringBuilder sb = new StringBuilder();

sb.append("************************************");

sb.append("\nempId: ").append(empId);

sb.append("\nname: ").append(name);

sb.append("\ndesignation: ").append(designation);

sb.append("\ndepartment: ").append(department);

sb.append("\nsalary: ").append(salary);

sb.append("\n************************************");

return sb.toString();

}

public int getEmpId() {

return empId;

}

public void setEmpId(int empId) {

this.empId = empId;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getDesignation() {

return designation;

}

public void setDesignation(String designation) {

this.designation = designation;

}

public String getDepartment() {

return department;

}

public void setDepartment(String department) {

this.department = department;

}

public int getSalary() {

return salary;

}

public void setSalary(int salary) {

this.salary = salary;

}

}

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OUTPUT:

************************************

empId: 1017

name: Nagesh Y

designation: Manager

department: Java2Novice

salary: 0

************************************

{

  "department" : "Java2Novice",

  "emp_id" : 1017,

  "emp_name" : "Nagesh Y",

  "emp_designation" : "Manager"

}