current_weather method implemented

src/main/java/de/hs_mannheim/domain/System.java

@@ -1,8 +1,17 @@
 package de.hs_mannheim.domain;
 
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandlers;
 import java.util.HashSet;
 import java.util.TreeSet;
 
+import org.json.JSONObject;
+
 public class System {
     
     private User current_user;
@@ -48,8 +57,29 @@ public class System {
         return new String[1];
     }
 
-    public String current_weather(){
-        return "";
+    public String current_weather() throws URISyntaxException, IOException, InterruptedException{
+        
+        String weather = "Fehler";
+        double temperature = 1; 
+        
+        HttpClient http_client = HttpClient.newHttpClient();
+        
+        HttpRequest get_request = HttpRequest.newBuilder()
+                                            .uri(new URI("https://api.openweathermap.org/data/2.5/weather?zip="+current_user.getZip()+",de&appid="+api_key+"&units=metric&lang=de)"))
+                                            .GET()
+                                            .build();
+        
+        HttpResponse get_response = http_client.send(get_request, BodyHandlers.ofString());
+
+        JSONObject json = new JSONObject(get_response.body());
+        weather = json.getJSONArray("weather").getJSONObject(0).getString("description");
+        temperature = json.getJSONObject("main").getDouble("temp");
+        
+        if(weather.equals("Fehler"))
+            return "Es ist ein Fehler aufgetreten!";
+        else
+            return weather + ": " + temperature + " °C";
+
     }
 
     public String weather_forecast(String destination_zip){