在Java中如何开发简易天气查询应用_天气查询项目实践解析

<dependencies>
    <!-- HTTP 客户端 -->
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.14</version>
    </dependency>
<pre class="brush:php;toolbar:false;"><!-- JSON 解析 -->
<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20230618</version>
</dependency>

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;
<p>public class WeatherApp {</p><pre class="brush:php;toolbar:false;">private static final String API_KEY = "your_api_key_here"; // 替换为你的Key
private static final String BASE_URL = "https://devapi.qweather.com/v7/weather/now";

public static void main(String[] args) throws Exception {
    if (args.length == 0) {
        System.out.println("请传入城市名称");
        return;
    }
    String city = args[0];
    String locationId = getLocationId(city); // 实际项目中需通过地理编码接口转换
    String url = BASE_URL + "?location=" + locationId + "&key=" + API_KEY;

    try (CloseableHttpClient client = HttpClients.createDefault()) {
        HttpGet request = new HttpGet(url);
        CloseableHttpResponse response = client.execute(request);

        if (response.getStatusLine().getStatusCode() == 200) {
            String jsonStr = EntityUtils.toString(response.getEntity());
            JSONObject json = new JSONObject(jsonStr);
            JSONObject now = json.getJSONObject("now");

            System.out.println("城市: " + city);
            System.out.println("温度: " + now.getString("temp") + "℃");
            System.out.println("天气: " + now.getString("text"));
            System.out.println("体感温度: " + now.getString("feelsLike") + "℃");
            System.out.println("风速: " + now.getString("windSpeed") + "km/h");
            System.out.println("湿度: " + now.getString("humidity") + "%");
        } else {
            System.out.println("请求失败，状态码：" + response.getStatusLine().getStatusCode());
        }
    }
}

// 模拟根据城市名获取Location ID（真实场景应调用Geo API）
private static String getLocationId(String city) {
    switch (city) {
        case "北京": return "101010100";
        case "上海": return "101020100";
        case "广州": return "101280101";
        default: return "101010100"; // 默认北京
    }
}

javac WeatherApp.java
java WeatherApp 北京