How to read specific json node in Jackson api (tree model)?

{
    "emp_id": 1017,
    "emp_name": "Nagesh Y",
    "emp_designation": "Manager",
    "department": "Java2Novice",
    "salary": 30000,
    "direct_reports": [
        "Nataraj G",
        "Kalyan",
        "Mahitha"
    ]
}

package com.java2novice.json.examples;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.ObjectMapper;

public class JsonTreeModleReadEx {

	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("/Users/java2novice/jsonInput.txt");
			
			JsonNode rootNode = mapper.readTree(jsonInputFile);
			// read employee id
			JsonNode empId = rootNode.path("emp_id");
			System.out.println(empId.getIntValue());
			// read employee name
			JsonNode empName = rootNode.path("emp_name");
			System.out.println(empName.getTextValue());
			// read direct reports
			JsonNode drNode = rootNode.path("direct_reports");
			Iterator<JsonNode> itr = drNode.getElements();
			System.out.println("\nDirect reports:");
			while (itr.hasNext()) {
				JsonNode temp = itr.next();
				System.out.println(temp.getTextValue());
 			}
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

1017
Nagesh Y


Direct reports:
Nataraj G
Kalyan
Mahitha