お天気アプリ

Main.java

package org.example;

import org.json.JSONObject;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;

public class Main {
    private static String inputStream2String(InputStream stream) {
        String result = "";
        StringBuilder sb = new StringBuilder();
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8));
            String line = reader.readLine();
            while (line != null) {
                sb.append(line);
                line = reader.readLine();
            }
            reader.close();
            result = sb.toString();
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return result;
    }

    public static void main(String[] args) {
        String response = "";
        String url = "https://api.openweathermap.org/data/2.5/weather?q=Osaka&lang=ja&units=metric&appid=fcb3f4b5b7a06bc9d509d4c4fdfa5e89";
        try {
            URL urlObject = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) urlObject.openConnection();
            connection.setConnectTimeout(1000);
            connection.setReadTimeout(1000);
            connection.setRequestMethod("GET");
            connection.connect();
            InputStream stream = connection.getInputStream();
            response = inputStream2String(stream);
            stream.close();
            connection.disconnect();
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        JSONObject json = new JSONObject(response);
        String cityName = json.getString("name");
        System.out.println(cityName + "の天気");
        JSONObject weather = json.getJSONArray("weather").getJSONObject(0);
        System.out.println("天気は" + weather.getString("description"));
        Double temperature = json.getJSONObject("main").getDouble("temp");
        System.out.println("気温は" + temperature);
        /**
         * 大阪市の天気
         * 天気は曇りがち
         * 気温は29.1
         */
    }
}