Beginner - Springboot weather program

Question

I'm learning Java and SpringBoot. Trying to make a web app to check the weather. I'm using API from https://openweathermap.org/api.

I do not know how to retrieve data from API (JSON). Could someone tell me something?

    public String connectAndResponse(String url) throws IOException {

    StringBuilder stringBuilder = new StringBuilder();
    HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();

    BufferedReader reader = new BufferedReader(new InputStreamReader(
            connection.getResponseCode()==200 ? connection.getInputStream() : connection.getErrorStream()
    ));

    String line = "";
    while((line = reader.readLine()) !=null){
        stringBuilder.append(line);
    }
    return stringBuilder.toString();
}

I have already processed JSON on a string but I do not know how to use JSON to use spring boot (it would work on a form where the locale is typing).

Answer 1

From Spring documentation "Consuming a RESTful Web Service" :

This guide walks you through the process of creating an application that consumes a RESTful web service.

First, you will have to define your model. In this case, it is Quote and Value.

Then, you will be able to call your API.

Here's the example :

public class Application {

    private static final Logger log = LoggerFactory.getLogger(Application.class);

    public static void main(String args[]) {
        RestTemplate restTemplate = new RestTemplate();
        Quote quote = restTemplate.getForObject("http://gturnquist-quoters.cfapps.io/api/random", Quote.class);
        log.info(quote.toString());
    }

}

RestTemplate will automatically transform JSON from API into Java object.