Stream for writing Json

Question

I have a large set JsonObjectinside a ArrayList. I need to add these JsonObjectto JsonArrayand write them to a file. I use Gson, and below is my code.

private void myWriter(List<JsonObject> jsonObjectHolder, int number) throws IOException
    {
        System.out.println("Starting to write the JSON File");
        //Add everything into a JSONArray
        JsonArray jsonArrayNew = new JsonArray();

        for(int i=0;i<jsonObjectHolder.size();i++)
        {
            //System.out.println("inside array: "+i);
            JsonObject o = jsonObjectHolder.get(i);
            System.out.println("inside array "+i+": "+o.get("title"));

            jsonArrayNew.add(jsonObjectHolder.get(i));
        }

        System.out.println("Size: "+jsonArrayNew.size());

        //Write it to the File
        File file= new File("items.json");

        FileWriter fw = new FileWriter(file);;
        fw.write(jsonArrayNew.toString());
        fw.flush();
        fw.close();

        System.out.println("outside array");


    }

I do not like it. ArrayListcontains a lot of data, and the way I write can generate OutOfMemoryError. Instead, I would like to Stream and write them to a file.

Update

According to the answer of SO "Alden" user, here is how I edited the code.

private void myWriter(List<JsonObject> jsonObjectHolder) throws IOException
{
    JsonWriter writer = new JsonWriter(new FileWriter(new File("items.json")));
    Gson gson = new Gson();

    writer.beginArray();

    for (JsonObject jsonObject : jsonObjectHolder)
    {
        gson.toJson(jsonObject, writer);
    }

    writer.endArray();

    writer.close();
}

Please let me know if this is done correctly.

Answer 1

Gson :

private void myWriter(List<JsonObject> jsonObjectHolder, Gson gson) throws IOException
{
    JsonWriter writer = new JsonWriter(new FileWriter(new File("items.json")));

    writer.beginArray();

    for (JsonObject jsonObject : jsonObjectHolder)
    {
        gson.toJson(jsonObject, writer);
    }

    writer.endArray();

    writer.close();
}

, Gson, . , writer.beginObject() writer.endObject() , , JsonObject.