Get the current celsius degree of a city

src/main/java/com/eistgeist/flightsystem/rest/WeatherController.java

@@ -0,0 +1,25 @@
+package com.eistgeist.flightsystem.rest;
+
+import com.eistgeist.flightsystem.service.WeatherService;
+import lombok.AllArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@AllArgsConstructor
+@CrossOrigin
+public class WeatherController {
+    private WeatherService weatherService;
+
+    @GetMapping("weather/{cityName}")
+    public ResponseEntity<Float> getWeather(@PathVariable String cityName) {
+        float temperature = weatherService.getWeather(cityName);
+        if(temperature == 0) return new ResponseEntity<>((float)0, HttpStatus.valueOf(402));
+        return ResponseEntity.ok(temperature);
+    }
+
+}

src/main/java/com/eistgeist/flightsystem/service/WeatherService.java

@@ -0,0 +1,47 @@
+package com.eistgeist.flightsystem.service;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.AllArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.net.HttpURLConnection;
+import java.net.URI;
+import java.net.URL;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.StringTokenizer;
+
+@Service
+@AllArgsConstructor
+public class WeatherService {
+
+    public float getWeather(String cityName) {
+        float temperature = 0;
+        try {
+            HttpClient client = HttpClient.newHttpClient();
+            HttpRequest request = HttpRequest.newBuilder()
+                    .version(HttpClient.Version.HTTP_2)
+                    .uri(URI.create("http://api.weatherapi.com/v1/current.json?key=447cdd8e041443e3adb182013222007&q="+cityName+"&aqi=no"))
+                    .GET()
+                    .build();
+            HttpResponse response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            String weatherResponse = response.body().toString();
+            StringTokenizer tokenizer = new StringTokenizer(weatherResponse,", :");
+            while(tokenizer.hasMoreTokens()) {
+                String nextToken = tokenizer.nextToken();
+                if(nextToken.contains("temp_c")) {
+                    System.out.println(nextToken);
+                    String temperatureString = tokenizer.nextToken();
+                    temperature= Float.parseFloat(temperatureString);
+                }
+            }
+        }
+        catch (Exception e) {
+        e.printStackTrace();
+        return temperature;
+        }
+        return temperature;
+    }
+}