How to Read JSON Object From File in Java?

What’s the best way to load a JSONObject from a json text file?

In this Java Example I’ll use the same file which we have generated in previous tutorial.

Maven Dependency:

<dependency>
    <groupId>com.googlecode.json-simple</groupId>
    <artifactId>json-simple</artifactId>
    <version>1.1.1</version>
</dependency>

Previous Tutorial: https://crunchify.com/how-to-write-json-object-to-file-in-java/

Sample JSON file content:

{
    "Name": "crunchify.com",
    "Author": "App Shah",
    "Company List": [
        "Compnay: eBay",
        "Compnay: Paypal",
        "Compnay: Google"
    ]
}

CrunchifyJSONReadFromFile.java

package crunchify.com.tutorials;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

import java.io.FileReader;
import java.util.Iterator;

/**
 * @author Crunchify.com
 * How to Read JSON Object From File in Java?
 */

public class CrunchifyJSONReadFromFile {
	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		JSONParser parser = new JSONParser();
		try {
			Object obj = parser.parse(new FileReader("//cdn.crunchify.com/Users/Shared/crunchify.json"));

			// A JSON object. Key value pairs are unordered. JSONObject supports java.util.Map interface.
			JSONObject jsonObject = (JSONObject) obj;

			// A JSON array. JSONObject supports java.util.List interface.
			JSONArray companyList = (JSONArray) jsonObject.get("Company List");

			// An iterator over a collection. Iterator takes the place of Enumeration in the Java Collections Framework.
			// Iterators differ from enumerations in two ways:
			// 1. Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics.
			// 2. Method names have been improved.
			Iterator<JSONObject> iterator = companyList.iterator();
			while (iterator.hasNext()) {
				System.out.println(iterator.next());
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Other must read: Create and Deploy simple Web Service and Web Service Client in Eclipse

Output:

Name: Crunchify.com
Author: App Shah

Company List:
Compnay: eBay
Compnay: Paypal
Compnay: Google

Download json-simple-1.1.1.jar