Java - Write JSON Data Simple Example

In below example, it writes JSON data via JSONObject and JSONArray, and save it into a file named “test.json“ using JSON.simple, a simple Java library for JSON processing.

import java.io.FileWriter;
import java.io.IOException;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

public class JsonSimpleExample {
    public static void main(String[] args) {

        JSONObject obj = new JSONObject();
        obj.put("name", "prasanna");
        obj.put("age", new Integer(25));

        JSONArray list = new JSONArray();
        list.add("msg 1");
        list.add("msg 2");
        list.add("msg 3");

        obj.put("messages", list);

        try {

            FileWriter file = new FileWriter("c:\\test.json");
            file.write(obj.toJSONString());
            file.flush();
            file.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.print(obj);

    }

}

import java.io.FileWriter;

import java.io.IOException;

import org.json.simple.JSONArray;

import org.json.simple.JSONObject;

public class JsonSimpleExample {

public static void main(String[] args) {

JSONObject obj = new JSONObject();

obj.put("name", "prasanna");

obj.put("age", new Integer(25));

JSONArray list = new JSONArray();

list.add("msg 1");

list.add("msg 2");

list.add("msg 3");

obj.put("messages", list);

try {

FileWriter file = new FileWriter("c:\\test.json");

file.write(obj.toJSONString());

file.flush();

file.close();

} catch (IOException e) {

e.printStackTrace();

}

System.out.print(obj);

}

Output: (see content of file “test.json”)

{
“age”:25,
“name”:”prasanna”,
“messages”:[“msg 1″,”msg 2″,”msg 3”]
}

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