Java实现简单天气查询方法

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class WeatherApp {
    private static final String API_KEY = "your_api_key_here";
    private static final String BASE_URL = "http://api.openweathermap.org/data/2.5/weather";

    public static String getWeatherData(String city) throws Exception {
        String urlString = BASE_URL + "?q=" + city + "&appid=" + API_KEY + "&units=metric&lang=zh_cn";
        URL url = new URL(urlString);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");

        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        StringBuilder response = new StringBuilder();
        String line;

        while ((line = reader.readLine()) != null) {
            response.append(line);
        }
        reader.close();
        return response.toString();
    }
}

import org.json.JSONObject;

public static void parseWeather(String jsonData) {
    JSONObject obj = new JSONObject(jsonData);

    String city = obj.getString("name");
    String country = obj.getJSONObject("sys").getString("country");
    double temp = obj.getJSONObject("main").getDouble("temp");
    int humidity = obj.getJSONObject("main").getInt("humidity");
    String description = obj.getJSONArray("weather").getJSONObject(0).getString("description");

    System.out.println("城市: " + city + ", " + country);
    System.out.println("温度: " + temp + "°C");
    System.out.println("湿度: " + humidity + "%");
    System.out.println("天气: " + description);
}

public static void main(String[] args) {
    try {
        System.out.print("请输入城市名称: ");
        java.util.Scanner scanner = new java.util.Scanner(System.in);
        String city = scanner.nextLine();

        String data = getWeatherData(city);
        parseWeather(data);
    } catch (Exception e) {
        System.out.println("查询失败：" + e.getMessage());
    }
}