gistfile1.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();

		}

	}
}