Go语言中读取命令参数的几种方法总结

所以我们的任务就是传入 “城市” 的名称，再对返回的 Json 数据解析。

package main

import (
  "fmt"
  "os"
 "encoding/json"
  "github.com/urfave/cli"
  "net/http"
  "io/ioutil"
  //"github.com/modood/table"
)
type Response struct {
  Status int `json:"status"`
  CityName string `json:"city"`
  Data  Data `json:"data"`
  Date  string `json:"date"`
  Message string `json:"message"`
  Count int `json:"count"`
}

type Data struct {
  ShiDu  string `json:"shidu"`
  Quality string `json:"quality"`
  Ganmao string `json:"ganmao"`
  Yesterday Day `json:"yesterday"`
  Forecast []Day `json:"forecast"`
}

type Day struct {
  Date string `json:"date"`
  Sunrise string `json:"sunrise"`
  High string `json:"high"`
  Low  string `json:"low"`
  Sunset string `json:"sunset"`
  Aqi  float32 `json:"aqi"`
  Fx  string `json:"fx"`
  Fl  string `json:"fl"`
  Type string `json:"type"`
  Notice string `json:"notice"`
}

func main() {
  const apiURL = "http://www.sojson.com/open/api/weather/json.shtml?city="
  app := cli.NewApp()
  app.Name = "weather-cli"
  app.Usage = "天气预报小程序"

  app.Flags = []cli.Flag{
    cli.StringFlag{
      Name: "city, c",
      Value: "上海",
      Usage: "城市中文名",
    },
    cli.StringFlag{
      Name: "day, d",
      Value: "今天",
      Usage: "可选: 今天, 昨天, 预测",
    },
    cli.StringFlag{
      Name: "Author, r",
      Value: "xiewei",
      Usage: "Author name",
    },
  }

  app.Action = func(c *cli.Context) error {
    city := c.String("city")
    day := c.String("day")

    var body, err = Requests(apiURL + city)
    if err != nil {
      fmt.Printf("err was %v", err)
      return nil
    }

    var r Response
    err = json.Unmarshal([]byte(body), &r)
    if err != nil {
      fmt.Printf("nError message: %v", err)
      return nil
    }
    if r.Status != 200 {
      fmt.Printf("获取天气API出现错误, %s", r.Message)
      return nil
    }
    Print(day, r)
    return nil
  }
  app.Run(os.Args)

}


func Print(day string, r Response) {
  fmt.Println("城市:", r.CityName)
  if day == "今天" {
    fmt.Println("湿度:", r.Data.ShiDu)
    fmt.Println("空气质量:", r.Data.Quality)
    fmt.Println("温馨提示:", r.Data.Ganmao)
  } else if day == "昨天" {
    fmt.Println("日期:", r.Data.Yesterday.Date)
    fmt.Println("温度:", r.Data.Yesterday.Low, r.Data.Yesterday.High)
    fmt.Println("风量:", r.Data.Yesterday.Fx, r.Data.Yesterday.Fl)
    fmt.Println("天气:", r.Data.Yesterday.Type)
    fmt.Println("温馨提示:", r.Data.Yesterday.Notice)
  } else if day == "预测" {
    fmt.Println("====================================")
    for _, item := range r.Data.Forecast {
      fmt.Println("日期:", item.Date)
      fmt.Println("温度:", item.Low, item.High)
      fmt.Println("风量:", item.Fx, item.Fl)
      fmt.Println("天气:", item.Type)
      fmt.Println("温馨提示:", item.Notice)
      fmt.Println("====================================")
    }
  } else {
    fmt.Println("...")
  }

}
func Requests(url string) (string, error) {
  response, err := http.Get(url)
  if err != nil {
    return "", err
  }
  defer response.Body.Close()
  body, _ := ioutil.ReadAll(response.Body)
  return string(body), nil
}								 
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