Golang如何解组嵌套的JSON数据的子集

{
    "coord": { "lon": -0.13, "lat": 51.51 }, "weather": [ { "id": 300, "main": "Drizzle", "description": "light intensity drizzle", "icon": "09d" } ], "base": "stations", "main": { "temp": 280.32, "pressure": 1012, "humidity": 81, "temp_min": 279.15, "temp_max": 281.15 }, "visibility": 10000, "wind": { "speed": 4.1, "deg": 80 }, "clouds": { "all": 90 }, "dt": 1485789600, "sys": { "type": 1, "id": 5091, "message": 0.0103, "country": "GB", "sunrise": 1485762037, "sunset": 1485794875 }, "id": 2643743, "name": "London", "cod": 200 }

 

要像这样的天气概述结构

type Weather struct { Location string Weather string Description string Temperature float32 MinTemperature float32 MaxTemperature float32 } 

使用标准的JSON包，我们将解组它，然后像这样重组它

    type Weather struct { Location string Weather string Description string Temperature float32 MinTemperature float32 MaxTemperature float32 } type TmpWeather struct { Location string `json:"name"` Weather []struct { Weather string `json:"main"` Description string `json:"description"` } `json:"weather"` Temperature struct { Temperature float32 `json:"temp"` MinTemperature float32 `json:"temp_min"` MaxTemperature float32 `json:"temp_max"` } `json:"main"` } var tmpW TmpWeather err := json.Unmarshal([]byte(jsonString), &tmpW) if err != nil { panic(err) } fmt.Printf("%+v\n", tmpW) // {Location:London Weather:[{Weather:Drizzle Description:light intensity drizzle}] Temperature:{Temperature:280.32 MinTemperature:279.15 MaxTemperature:281.15}} weather := Weather{ Location: tmpW.Location, Weather: tmpW.Weather[0].Weather, Description: tmpW.Weather[0].Description, Temperature: tmpW.Temperature.Temperature, MinTemperature: tmpW.Temperature.MinTemperature, MaxTemperature: tmpW.Temperature.MaxTemperature, } fmt.Printf("%+v\n", weather) // {Location:London Weather:Drizzle Description:light intensity drizzle Temperature:280.32 MinTemperature:279.15 MaxTemperature:281.15} 

将njson标记添加到struct，
然后像这样使用NJSON解组

    type Weather struct { Location string `njson:"name"` Weather string `njson:"weather.0.main"` Description string `njson:"weather.0.description"` Temperature float32 `njson:"main.temp"` MinTemperature float32 `njson:"main.temp_min"` MaxTemperature float32 `njson:"main.temp_max"` } var weather Weather err := njson.Unmarshal([]byte(jsonString), &weather) if err != nil { panic(err) } fmt.Printf("%+v\n", weather) // {Location:London Weather:Drizzle Description:light intensity drizzle Temperature:280.32 MinTemperature:279.15 MaxTemperature:281.15}