使用天气预报的接口： （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"        }    ]}

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 mainimport (    "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