open-meteo

src/main/java/waluty/PobierzPogodeDlaMiasta.java

+package waluty;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Scanner;
+
+import jakarta.json.Json;
+import jakarta.json.JsonArray;
+import jakarta.json.JsonObject;
+import jakarta.json.JsonReader;
+import jakarta.json.JsonValue;
+
+public class PobierzPogodeDlaMiasta {
+	private Scanner scanner = new Scanner(System.in);
+	private double lat;
+	private double lon;
+	private String miasto;
+	
+
+	public static void main(String[] args) {
+		new PobierzPogodeDlaMiasta().run();
+	}
+
+	public void run() {
+		try {
+		System.out.print("Podaj nazwę miasta: ");
+		String szukane = scanner.nextLine();
+		if(znajdzMiasto(szukane)) {
+			pobierzIWypiszPogode();
+		}
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+	
+	private boolean znajdzMiasto(String szukane) throws IOException {
+		URL url = new URL("https://geocoding-api.open-meteo.com/v1/search?name=" + szukane);
+		try(InputStream input = url.openStream();
+			JsonReader reader = Json.createReader(input)) {
+			JsonObject json = reader.readObject();
+			JsonArray results = json.getJsonArray("results");
+			if(results.isEmpty()) {
+				System.out.println("Brak znalezionych lokalizacji");
+				return false;
+			}
+			System.out.println("Znalezione lokalizacje:");
+			int i = 0;
+			for(JsonValue result : results) {
+				JsonObject resulto = result.asJsonObject();
+				//System.out.print(result);
+				System.out.printf("%2d: <%+.3f %+.3f> → %s, %s%n", i++,
+						resulto.getJsonNumber("latitude").doubleValue(),
+						resulto.getJsonNumber("longitude").doubleValue(),
+						resulto.getString("name"), resulto.getString("country"));
+			}
+			System.out.print("Wybierz numer lokalizacji: ");
+			i = scanner.nextInt();
+			if(i < 0 || i >= results.size()) {
+				return false;
+			}
+			JsonObject loc = results.getJsonObject(i);
+			lat = loc.getJsonNumber("latitude").doubleValue();
+			lon = loc.getJsonNumber("longitude").doubleValue();
+			miasto = loc.getString("name");
+			return true;
+		}
+	}
+	
+	private void pobierzIWypiszPogode() throws IOException {
+		URL url = new URL("https://api.open-meteo.com/v1/forecast?latitude=" + lat + "&longitude="+ lon +"&current_weather=true&hourly=temperature_2m");
+		try(InputStream input = url.openStream();
+			JsonReader reader = Json.createReader(input)) {
+			JsonObject json = reader.readObject();
+			JsonObject weather = json.getJsonObject("current_weather");
+			
+			System.out.printf("Bieżąca pogoda dla miasta %s:%n", miasto);
+			System.out.println(weather);
+			System.out.printf("Temperatura %.1f °C%n", weather.getJsonNumber("temperature").doubleValue());
+			System.out.printf("Wiatr:      %.1f m/s%n", weather.getJsonNumber("windspeed").doubleValue());
+		}
+	}
+	
+}