尝试通过OpenWeather API使用GSON

import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class WeatherInfo {
    public static void main(String[] args) {
        String apiKey = "YOUR_API_KEY";
        String city = "London";
        String apiUrl = "https://api.openweathermap.org/data/2.5/weather?q=" + city + "&appid=" + apiKey;

        try {
            URL url = new URL(apiUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");

            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            StringBuilder response = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();

            Gson gson = new Gson();
            WeatherData weatherData = gson.fromJson(response.toString(), WeatherData.class);

            System.out.println("City: " + weatherData.name);
            System.out.println("Temperature: " + weatherData.main.temp);
            System.out.println("Humidity: " + weatherData.main.humidity);
            System.out.println("Wind Speed: " + weatherData.wind.speed);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static class WeatherData {
        @SerializedName("name")
        private String name;

        @SerializedName("main")
        private MainData main;

        @SerializedName("wind")
        private WindData wind;

        private static class MainData {
            @SerializedName("temp")
            private double temp;

            @SerializedName("humidity")
            private int humidity;
        }

        private static class WindData {
            @SerializedName("speed")
            private double speed;
        }
    }
}