How to rename JSON properties using Jackson annotations?

package com.java2novice.json.models;

import org.codehaus.jackson.annotate.JsonProperty;

public class Employee {

	@JsonProperty("emp_id")
	private int empId;
	
	@JsonProperty("emp_name")
	private String name;
	
	@JsonProperty("emp_designation")
	private String designation;
	
	private String department;
	
	private int salary;
	
	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;
	}
}

package com.java2novice.json.examples;

import java.io.File;
import java.io.IOException;

import org.codehaus.jackson.map.ObjectMapper;

import com.java2novice.json.models.Employee;

public class JsonToObject {
	
	public static void main(String a[]){
		
		ObjectMapper mapper = new ObjectMapper();
		try {
			// reading json input from the file and mapping to object
			File jsonInputFile = new File("C:\\jsonInput.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();
		}
	}
}

{
    "emp_id": 1017,
    "emp_name": "Nagesh Y",
    "emp_designation": "Manager",
    "department": "Java2Novice",
    "salary": 30000
}

************************************
empId: 1017
name: Nagesh Y
designation: Manager
department: Java2Novice
salary: 30000
************************************

{
  "department" : "Java2Novice",
  "salary" : 30000,
  "emp_id" : 1017,
  "emp_name" : "Nagesh Y",
  "emp_designation" : "Manager"
}