CODEWITHSUNDEEP
javajson
Deepak
Deepak

Reputation: 195

How to create multiple JSON array

I was looking this for creating JSON and the output is

{ "age":100, "name":"mkyong.com", "messages":["msg 1","msg 2","msg 3"] }

But i want an array of 10 times like this 

{
        "engine": "Trident",
        "browser": "Internet Explorer 4.0",
        "platform": "Win 95+",

    },
    {
        "engine": "Trident",
        "browser": "Internet Explorer 5.0",
        "platform": "Win 95+",

    },
    {
        "engine": "Trident",
        "browser": "Internet Explorer 5.5",
        "platform": "Win 95+",

    },

And this is the way I tried

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

public class TestJson {
     public static void main(String[] args) {
        JSONObject obj=null;
         obj = new JSONObject();
    for(int i=0;i<10;i++)
    {

    obj.put("engine", "mkyong.com");
    obj.put("browser", i);
obj.put("platform", i);



    //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);

     }

}

but this only prints 1 json

{
        "engine": "Trident",
        "browser": "Internet Explorer 4.0",
        "platform": "Win 95+",

    }

Upvotes: 0

Views: 6609

Answers (2)

Mehran Hatami
Mehran Hatami

Reputation: 12961

you can do this:

JSONObject jsonObject = new JSONObject();
JSONArray array = new JSONArray();
for(int i=0;i<10;i++){
    JSONObject obj = new JSONObject();
    obj.put("engine", "mkyong.com");
    obj.put("browser", i);
    obj.put("platform", i);

    //if you are using JSON.simple do this
    array.add(obj);

    //and if you use json-jena
    array.put(obj);
}
jsonObject.put("MyArray" , array);

System.out.print(jsonObject);

Upvotes: 2

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 280177

In the following code

JSONObject obj=null;
obj = new JSONObject();
for(int i=0;i<10;i++)
{

    obj.put("engine", "mkyong.com");
    obj.put("browser", i);
    obj.put("platform", i);

    //obj.put("messages", list);
}

you are creating a single JSONObject and overwriting its values 10 times.

Why are you working with a JSONObject when you want a JSON array?

Create a JSONArray and add 10 JSONObject objects to it.

Upvotes: 0

Related Questions