Golang开发天气信息展示与API服务

package main

import (
    "encoding/json"
    "fmt"
    "io"
    "log"
    "net/http"
)

type Weather struct {
    Main      string  `json:"main"`
    Icon      string  `json:"icon"`
    Description string `json:"description"`
}

type Main struct {
    Temp     float64 `json:"temp"`
    Humidity int     `json:"humidity"`
}

type Wind struct {
    Speed float64 `json:"speed"`
}

type WeatherResponse struct {
    Name    string   `json:"name"`
    Weather []Weather `json:"weather"`
    Main    Main     `json:"main"`
    Wind    Wind     `json:"wind"`
}

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

    resp, err := http.Get(url)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    if resp.StatusCode != http.StatusOK {
        return nil, fmt.Errorf("城市未找到或API错误: %s", resp.Status)
    }

    body, err := io.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }

    var data WeatherResponse
    err = json.Unmarshal(body, &data)
    if err != nil {
        return nil, err
    }

    return &data, nil
}

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

    weatherData, err := getWeather(city)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

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

func main() {
    http.HandleFunc("/weather", weatherHandler)
    fmt.Println("服务启动在 :8080")
    log.Fatal(http.ListenAndServe(":8080", nil))
}

// 在main函数中注册静态资源
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))

<input type="text" id="city" placeholder="输入城市">
<button onclick="fetchWeather()">查询</button>
<div id="result"></div>

<script>
function fetchWeather() {
    const city = document.getElementById("city").value;
    fetch(`/weather?city=${city}`)
        .then(res => res.json())
        .then(data => {
            document.getElementById("result").innerHTML = `
                <h3>${data.name}</h3>
                <p>温度: ${data.main.temp}°C</p>
                <p>天气: ${data.weather[0].description}</p>
                <p>湿度: ${data.main.humidity}%</p>
            `;
        })
        .catch(err => alert("查询失败：" + err.message));
}
</script>

├── main.go
├── static/
│   └── index.html