Golang构建天气信息查询API示例

type WeatherResponse struct {
    Main struct {
        Temp     float64 `json:"temp"`
        Humidity int     `json:"humidity"`
    } `json:"main"`
    Name string `json:"name"`
    Sys  struct {
        Country string `json:"country"`
    } `json:"sys"`
}

func getWeather(w http.ResponseWriter, r *http.Request) {
    city := r.URL.Query().Get("city")
    if city == "" {
        http.Error(w, "缺少城市参数", http.StatusBadRequest)
        return
    }

    apiKey := "你的API密钥" // 替换为你的实际密钥
    url := fmt.Sprintf("http://api.openweathermap.org/data/2.5/weather?q=%s&appid=%s&units=metric&lang=zh_cn", city, apiKey)

    resp, err := http.Get(url)
    if err != nil {
        http.Error(w, "请求天气数据失败", http.StatusInternalServerError)
        return
    }
    defer resp.Body.Close()

    if resp.StatusCode != http.StatusOK {
        http.Error(w, "城市未找到或API错误", http.StatusNotFound)
        return
    }

    var weather WeatherResponse
    body, _ := ioutil.ReadAll(resp.Body)
    json.Unmarshal(body, &weather)

    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(weather)
}

func main() {
    http.HandleFunc("/weather", getWeather)
    fmt.Println("服务器启动在 :8080")
    http.ListenAndServe(":8080", nil)
}