The below Example will show you how to read the specific property from the file in JSON format or to read the Specific property from the JSON data.

emp.txt

{
  "id": 123,
  "name": "Manish",

  "phone": [
    123456,
    987654
  ],
  "role": "Manager",
  "cities": [
    "Los Angeles",
    "New York"
  ],
  "properties": {
    "age": "29 years",
    "salary": "1000 USD"
  }
}

JSONDemo.java

package com.evon;

import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Iterator;

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

public class JSONDemo {

    /**
     * @param args
     */
    public static void main(String[] args)throws Exception {
        // TODO Auto-generated method stub

        byte[] jsonData = Files.readAllBytes(Paths.get("emp.txt"));
        ObjectMapper objectMapper = new ObjectMapper();

        //read JSON like DOM Parser
        JsonNode rootNode = objectMapper.readTree(jsonData);
        JsonNode nameNode = rootNode.path("name");
        System.out.println("name = "+nameNode.asText());

        JsonNode phoneNosNode = rootNode.path("phone");
        Iterator<JsonNode> elements = phoneNosNode.getElements();
        while(elements.hasNext()){
            JsonNode phone = elements.next();
            System.out.println("Phone's = "+phone.asLong());
        }

    }

}

In the above Code we have only read the specific property name and phone from the file which is in JSON format.