How to save files to a server via Java?

I need to save a file to a server using Java . In my case, I need to save a json file. Can I save a file normally on my computer, but how do I save directly to a remote server? Here is an example that saves a file to my computer. My question is: to save this file to a remote server, how could I do it?

public class EstudoJSON {

    public static void main(String[] args) throws IOException {
        JSONObject json = adicaoSimplesDeDados ();

        FileWriter file = new FileWriter("json//javaJSON.json");
        file.write(json.toString());
        file.flush();
        file.close();

        System.out.println(json.toString());

        adicaoDeUmObjeto ();
    }

    public static JSONObject adicaoSimplesDeDados () {
        Carro carro = new Carro();
        carro.setId(1l);
        carro.setModelo("Celta");
        carro.setPlaca("AAA1234");

        //Criacao do objeto carroJson
        JSONObject carroJson = new JSONObject();
        //Insercao de valores do carro no objeto JSON
        carroJson.put("id", carro.getId());
        carroJson.put("Modelo", carro.getModelo());
        carroJson.put("Placa", carro.getPlaca());

        System.out.println(carroJson);
        System.out.println(carroJson.get("Modelo"));

        return carroJson;
    } 

    public static void adicaoDeUmObjeto () {
        Carro carro = new Carro();
        carro.setId(1l);
        carro.setModelo("Ka");
        carro.setPlaca("AAA1234");

        JSONObject carroJson = new JSONObject();
        carroJson.put("Carro", carro);

        System.out.println(carroJson);
        System.out.println(carroJson.get("Carro"));
    }

}