java根据经纬度获取天气

要根据经纬度获取天气，可以使用第三方天气 API。以下是一种使用 OpenWeatherMap API 获取天气数据的示例：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import org.json.JSONObject;

public class Weather {
    public static void main(String[] args) {
        try {
            // 经纬度信息
            double lat = 40.7128;
            double lon = -74.0060;
            // 调用 OpenWeatherMap API
            String apiKey = "your_api_key";
            String url = "https://api.openweathermap.org/data/2.5/weather?lat=" + lat + "&lon=" + lon + "&appid=" + apiKey;
            URLConnection conn = new URL(url).openConnection();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            reader.close();
            // 解析 JSON 数据
            JSONObject json = new JSONObject(sb.toString());
            JSONObject main = json.getJSONObject("main");
            double temp = main.getDouble("temp");
            double feelsLike = main.getDouble("feels_like");
            double humidity = main.getDouble("humidity");
            String description = json.getJSONArray("weather").getJSONObject(0).getString("description");
            // 打印天气信息
            System.out.println("Temperature: " + temp + " K");
            System.out.println("Feels like: " + feelsLike + " K");
            System.out.println("Humidity: " + humidity + " %");
            System.out.println("Description: " + description);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

需要替换代码中的 `your_api_key` 为你自己的 OpenWeatherMap API Key。此示例仅提供了温度、体感温度、湿度和天气描述等基本信息，你可以根据需要选择解析更多的 JSON 数据。