使用天气预报的接口：http://weather.china.xappengine.com/api?city=南宁 （找了好久才找到一个支持拼音的，不过好像小地方是没数据的）
访问得到json格式压缩的数据，格式化后
{
"pub": "2013-06-29 22:59",
"name": "南宁",
"wind": {
"chill": 81,
"direction": 140,
"speed": 7
},
"astronomy": {
"sunrise": "6:05",
"sunset": "19:34"
},
"atmosphere": {
"humidity": 89,
"visibility": 6.21,
"pressure": 29.71,
"rising": 1
},
"forecasts": [
{
"date": "2013-06-29",
"day": 6,
"code": 29,
"text": "局部多云",
"low": 26,
"high": 32,
"image_large": "http://weather.china.xappengine.com/static/w/img/d29.png",
"image_small": "http://weather.china.xappengine.com/static/w/img/s29.png"
},
{
"date": "2013-06-30",
"day": 0,
"code": 30,
"text": "局部多云",
"low": 25,
"high": 33,
"image_large": "http://weather.china.xappengine.com/static/w/img/d30.png",
"image_small": "http://weather.china.xappengine.com/static/w/img/s30.png"
},
{
"date": "2013-07-01",
"day": 1,
"code": 37,
"text": "局部雷雨",
"low": 24,
"high": 32,
"image_large": "http://weather.china.xappengine.com/static/w/img/d37.png",
"image_small": "http://weather.china.xappengine.com/static/w/img/s37.png"
},
{
"date": "2013-07-02",
"day": 2,
"code": 38,
"text": "零星雷雨",
"low": 25,
"high": 32,
"image_large": "http://weather.china.xappengine.com/static/w/img/d38.png",
"image_small": "http://weather.china.xappengine.com/static/w/img/s38.png"
},
{
"date": "2013-07-03",
"day": 3,
"code": 38,
"text": "零星雷雨",
"low": 25,
"high": 32,
"image_large": "http://weather.china.xappengine.com/static/w/img/d38.png",
"image_small": "http://weather.china.xappengine.com/static/w/img/s38.png"
}
]
} GO语言内置的encoding/json标准库，Json.Unmarshal() 可以解析json数据
约定：json中的布尔值会解析为布尔值，数字（整数，浮点型）解析为float64，string解析为string，数组解析为接口数组，空值解析为nil。 这些字段在类型声明中必须都是以大写字母开头、可被导出的字段。
Json.Unmarshal()函数会根据一个约定的顺序查找目标结构中的字段，如果找到一个则进行匹配。当JSON数据中的数据结构和GO中的目标类型不匹配时，json.Unmarshal（）函数在解码过程中会丢弃该字段。
Json.Unmarshal()函数也支持读取未知的结构的json数据，允许使用map[string]interface{}和[]interface{}类型的值来分别存放未知结构的JSON对象或数组。
package main
import (
"encoding/json"
"io/ioutil"
"net/http"
"fmt"
)
//对应json天气数据源的结构，头字母大写
type WeatherInfoJson struct {
Pub string
Name string
Wind WindObject
Astronomy AstronomyObject
Atmosphere AtmosphereObject
Forecasts []ForecastsObject
}
type WindObject struct {
Chill float64
Direction float64
Speed float64
}
type AstronomyObject struct {
Sunrise string
Sunset string
}
type AtmosphereObject struct {
Humidity float64
Visibility float64
Pressure float64
Rising float64
}
type ForecastsObject struct {
Date string
Day float64
Code float64
Text string
Low float64
High float64
Image_large string
Image_small string
}
func GetWeather(city string) {
str:="http://weather.china.xappengine.com/api?city="+city
resp, err := http.Get(str) //使用get方法访问
if err != nil {
return
}
defer resp.Body.Close()
input, err1 := ioutil.ReadAll(resp.Body) //读取流数据
if err1 != nil {
return
}
var jsonWeather WeatherInfoJson
err2:=json.Unmarshal(input, &jsonWeather) //解析json数据
if err2 != nil {
return
}
if len(jsonWeather.Name)!=0 { //判断有无解析数据
for i := 0; i < 3; i++ {
fmt.Printf("-->地区:%s 时间:%s 温度:%d-%d 天气:%s 发布时间:%s\n", jsonWeather.Name,jsonWeather.Forecasts[i].Date,int(jsonWeather.Forecasts[i].Low),int(jsonWeather.Forecasts[i].High),jsonWeather.Forecasts[i].Text,jsonWeather.Pub)
}
}
}
func main(){
GetWeather("深圳")
GetWeather("nanning")
}
运行结果如下
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