怎样用Golang开发一个天气查询工具 调用第三方API实战

http://api.openweathermap.org/data/2.5/weather?q={city}&appid={your_api_key}

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func getWeather(city string, apiKey string) {
    url := fmt.Sprintf("http://api.openweathermap.org/data/2.5/weather?q=%s&appid=%s", city, apiKey)

    resp, err := http.Get(url)
    if err != nil {
        fmt.Println("请求失败:", err)
        return
    }
    defer resp.Body.Close()

    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
}

type WeatherResponse struct {
    Name string `json:"name"`
    Main struct {
        Temp     float64 `json:"temp"`
        Humidity int     `json:"humidity"`
    } `json:"main"`
    Weather []struct {
        Description string `json:"description"`
    } `json:"weather"`
}

var data WeatherResponse
err = json.Unmarshal(body, &data)
if err != nil {
    fmt.Println("解析失败:", err)
    return
}

fmt.Printf("城市: %s\n", data.Name)
fmt.Printf("温度: %.2f°C\n", data.Main.Temp-273.15)
fmt.Printf("湿度: %d%%\n", data.Main.Humidity)
fmt.Printf("天气描述: %s\n", data.Weather[0].Description)

city := flag.String("city", "Beijing", "请输入城市名称")
apiKey := flag.String("key", "", "请输入你的API密钥")
flag.Parse()

if *apiKey == "" {
    fmt.Println("请提供API密钥")
    return
}

getWeather(*city, *apiKey)

go run main.go -city=Shanghai -key=your_api_key_here