Nikos Maravitsas

About Nikos Maravitsas

Nikos has graduated from the Department of Informatics and Telecommunications of The National and Kapodistrian University of Athens. Currently, his main interests are system’s security, parallel systems, artificial intelligence, operating systems, system programming, telecommunications, web applications, human – machine interaction and mobile development.

Jackson Tree Model example

In this example we are going to see how to use Jackson Tree Model. This model is very similar in many ways with the DOM representation. We are going to see how to create the tree model and update the JSON object with new values.
 
 
 
 
 
 
 
 
 
Here is the file we are going to use for the demo:

mapExample.json:

{"names":["Jonh","Jack","James"],"interest":"Java","domain":"JavaCodeGeeks.com","members":400}

JacksonTreeNodeTutorial.java:

package com.javacodegeeks.java.core;

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

import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.node.ObjectNode;

public class JacksonTreeNodeTutorial {

	private static final String jsonFilePath = "C:\\Users\\nikos7\\Desktop\\filesForExamples\\mapExample.json";

	public static void main(String[] args) {

		ObjectMapper mapper = new ObjectMapper();

		try {

			FileReader fileReader = new FileReader(jsonFilePath);

			BufferedReader bufferedReader = new BufferedReader(fileReader);

			JsonNode rootNode = mapper.readTree(bufferedReader);

			JsonNode domainNode = rootNode.path("domain");

			System.out.println("domain : "+domainNode.getTextValue());

			JsonNode interestNode = rootNode.path("interest");

			System.out.println("interest : " + interestNode.getTextValue());

			JsonNode memebers = rootNode.path("members");

			System.out.println("members : "+memebers.getIntValue());

			JsonNode namesListNode = rootNode.path("names");

			System.out.println("names : ");

			Iterator iterator = namesListNode.getElements();

			while (iterator.hasNext()) {

				JsonNode temp = iterator.next();
				System.out.println(" "+temp.getTextValue());

			}

			((ObjectNode)rootNode).put("domain", "wwww.javacodegeeks.com");

			((ObjectNode)rootNode).put("members", 600);

			((ObjectNode)rootNode).remove("interest");

			File file = new File(jsonFilePath);

			mapper.writeValue(file, rootNode);

		} catch (JsonGenerationException e) {

			e.printStackTrace();

		} catch (JsonMappingException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

	}
}

mapExample.json:

{"names":["Jonh","Jack","James"],"domain":"wwww.javacodegeeks.com","members":600}

 
This was an example on Jackson Tree Model.

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