JAVA中获取实时气象信息的方法_java获取天气数据

在Java中获取实时气象信息，可以通过调用气象API（如Open-Meteo、OpenWeatherMap等）实现。

方法1：使用 HttpClient（Java 11+）调用Open-Meteo API

Open-Meteo是一个免费的天气API，无需API密钥即可使用。

public static void main(String[] args) { double latitude = 39.9042; // 北京纬度 double longitude = 116.4074; // 北京经度 String apiUrl = String.format( \"https://api.open-meteo.com/v1/forecast?latitude=%.4f&longitude=%.4f&current_weather=true\", latitude, longitude ); HttpClient client = HttpClient.newHttpClient(); HttpRequest request = HttpRequest.newBuilder() .uri(URI.create(apiUrl)) .build(); try { HttpResponse response = client.send(request, HttpResponse.BodyHandlers.ofString()); ObjectMapper mapper = new ObjectMapper(); JsonNode rootNode = mapper.readTree(response.body()); // 解析当前天气数据 JsonNode currentWeather = rootNode.path(\"current_weather\"); double temperature = currentWeather.path(\"temperature\").asDouble(); double windspeed = currentWeather.path(\"windspeed\").asDouble(); int windDirection = currentWeather.path(\"winddirection\").asInt(); System.out.println(\"当前温度: \" + temperature + \"°C\"); System.out.println(\"风速: \" + windspeed + \" km/h\"); System.out.println(\"风向: \" + windDirection + \"°\"); } catch (Exception e) { e.printStackTrace(); } }

输出示例： 

当前温度: 25.3°C
风速: 12.5 km/h
风向: 180°

方法2：使用 OkHttp 调用OpenWeatherMap API 

OpenWeatherMap提供更详细的天气数据，但需要API密钥（免费注册） 

使用到的依赖

 com.squareup.okhttp3 okhttp 4.10.0 com.fasterxml.jackson.core jackson-databind 2.15.0

public static void main(String[] args) { String apiKey = \"YOUR_API_KEY\"; // 替换为你的API密钥 String city = \"Beijing\"; String apiUrl = \"https://api.openweathermap.org/data/2.5/weather?q=\" + city + \"&appid=\" + apiKey + \"&units=metric\"; OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url(apiUrl) .build(); try { Response response = client.newCall(request).execute(); String responseBody = response.body().string(); ObjectMapper mapper = new ObjectMapper(); JsonNode rootNode = mapper.readTree(responseBody); // 解析天气数据 double temperature = rootNode.path(\"main\").path(\"temp\").asDouble(); double humidity = rootNode.path(\"main\").path(\"humidity\").asDouble(); String weatherDesc = rootNode.path(\"weather\").get(0).path(\"description\").asText(); System.out.println(\"当前温度: \" + temperature + \"°C\"); System.out.println(\"湿度: \" + humidity + \"%\"); System.out.println(\"天气状况: \" + weatherDesc); } catch (Exception e) { e.printStackTrace(); } }

 输出示例：

当前温度: 26.5°C湿度: 65%天气状况: 多云

方法3：使用 Spring WebClient 

 org.springframework.boot spring-boot-starter-webflux

public class WeatherService { private final WebClient webClient; public WeatherService() { this.webClient = WebClient.create(\"https://api.open-meteo.com\"); } public Mono getCurrentWeather(double latitude, double longitude) { return webClient.get() .uri(uriBuilder -> uriBuilder .path(\"/v1/forecast\") .queryParam(\"latitude\", latitude) .queryParam(\"longitude\", longitude) .queryParam(\"current_weather\", true) .build()) .retrieve() .bodyToMono(String.class); } public static void main(String[] args) { WeatherService service = new WeatherService(); service.getCurrentWeather(39.9042, 116.4074) .subscribe(System.out::println); }}

输出示例： 

{ \"latitude\": 39.9042, \"longitude\": 116.4074, \"current_weather\": { \"temperature\": 25.3, \"windspeed\": 12.5, \"winddirection\": 180 }}

总结