go语言请求http接口示例 并解析json

本例请求了天气api接口

对接流程

1. 注册一个账号, 对接免费实况天气接口
2. 阅读接口文档 http://tianqiapi.com/index/doc?version=day
3. 请求接口
4. 解析json

开发流程

1. 创建一个 json.go 文件
2. 需要引入的包

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

3. 定义 Weather Struct

    go结构体内的变量首字母必须大写
   

type Weather struct {
	Nums        int
	Cityid      string
	City        string
	Date        string
	Week        string
	Update_time string
	Wea         string
	Wea_img     string
	Tem         string
	Tem_day     string
	Tem_night   string
	Win         string
	Win_speed   string
	Win_meter   string
	Air         string
	Pressure    string
	Humidity    string
}

4. http.Get 请求接口
5. json.Unmarshal 解析json
6. gofmt -w json.go 格式化代码

完整代码

package main

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

type Weather struct {
	Nums        int
	Cityid      string
	City        string
	Date        string
	Week        string
	Update_time string
	Wea         string
	Wea_img     string
	Tem         string
	Tem_day     string
	Tem_night   string
	Win         string
	Win_speed   string
	Win_meter   string
	Air         string
	Pressure    string
	Humidity    string
}

func main() {
	resp, err := http.Get("http://v1.yiketianqi.com/free/day?appid=85841439&appsecret=EKCDLT4I&unescape=1&city=")
	if err != nil {
		fmt.Println("请求失败：", err)
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println("读取响应失败：", err)
	}
	fmt.Println(string(body))
	jsonData := []byte(string(body))
	var wea Weather
	err2 := json.Unmarshal(jsonData, &wea)
	if err2 != nil {
		fmt.Println("error:", err2)
		return
	}
	fmt.Println("城市名称：", wea.City)
	fmt.Println("城市编号：", wea.Cityid)
	fmt.Println("当前日期：", wea.Date, wea.Week)
	fmt.Println("更新时间：", wea.Update_time)
	fmt.Println("今日天气：", wea.Tem, "°", wea.Wea, wea.Tem_night, "°~", wea.Tem_day, "°")
	fmt.Println("风向风力：", wea.Win, wea.Win_speed, wea.Win_meter)
	fmt.Println("空气质量：", wea.Air)
	fmt.Println("当前气压：", wea.Pressure)
	fmt.Println("当前湿度：", wea.Humidity)
	fmt.Println("数据来源：", "天气API（http://tianqiapi.com）")
}