Java中获取实时气象信息的3种方法_Java

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<string> 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

<dependency>
    <groupid>com.squareup.okhttp3</groupid>
    <artifactid>okhttp</artifactid>
    <version>4.10.0</version>
</dependency>
<dependency>
    <groupid>com.fasterxml.jackson.core</groupid>
    <artifactid>jackson-databind</artifactid>
    <version>2.15.0</version>
</dependency>

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

<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-webflux</artifactid>
</dependency>

public class weatherservice {
    private final webclient webclient;

    public weatherservice() {
        this.webclient = webclient.create("https://api.open-meteo.com");
    }

    public mono<string> 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

方法	适用场景	是否需要api密钥	推荐指数
open-meteo	免费、简单、全球数据	❌ 不需要	⭐⭐⭐⭐
openweathermap	更详细数据，但需注册	✅ 需要	⭐⭐⭐
spring webclient	spring boot项目，异步支持	视api而定	⭐⭐⭐⭐