我有此JSON代码
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"temp_min": 288.302,
"temp_max": 288.302,
"pressure": 873.42,
"sea_level": 1020.19,
"grnd_level": 873.42,
"humidity": 68,
"temp_kf": 0
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01n"
}],
"clouds": {
"all": 0
},
"wind": {
"speed": 1.42,
"deg": 10.0019
},
"rain": {},
"sys": {
"pod": "n"
},
"dt_txt": "2018-06-27 00:00:00"
}, {
"dt": 1530068400,
"main": {
"temp": 290.209,
"temp_min": 290.209,
"temp_max": 290.209,
"pressure": 873.93,
"sea_level": 1020.72,
"grnd_level": 873.93,
"humidity": 65,
"temp_kf": 0
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}],
"clouds": {
"all": 0
},
"wind": {
"speed": 1.66,
"deg": 36
},
"rain": {},
"sys": {
"pod": "d"
},
"dt_txt": "2018-06-27 03:00:00"
}, {
"dt": 1530079200,
"main": {
"temp": 297.644,
"temp_min": 297.644,
"temp_max": 297.644,
"pressure": 873.95,
"sea_level": 1019.72,
"grnd_level": 873.95,
"humidity": 52,
"temp_kf": 0
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}],
"clouds": {
"all": 0
},
"wind": {
"speed": 1.61,
"deg": 230
},
"rain": {},
"sys": {
"pod": "d"
},
"dt_txt": "2018-06-27 06:00:00"
}, {
"dt": 1530090000,
"main": {
"temp": 301.518,
"temp_min": 301.518,
"temp_max": 301.518,
"pressure": 873.16,
"sea_level": 1018.11,
"grnd_level": 873.16,
"humidity": 45,
"temp_kf": 0
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}],
"clouds": {
"all": 0
},
"wind": {
"speed": 0.51,
"deg": 309.5
},
"rain": {},
"sys": {
"pod": "d"
},
"dt_txt": "2018-06-27 09:00:00"
}, {
"dt": 1530100800,
"main": {
"temp": 303.24,
"temp_min": 303.24,
"temp_max": 303.24,
"pressure": 872.25,
"sea_level": 1016.8,
"grnd_level": 872.25,
"humidity": 32,
"temp_kf": 0
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}],
"clouds": {
"all": 0
},
"wind": {
"speed": 1.32,
"deg": 304.5
},
"rain": {},
"sys": {
"pod": "d"
},
"dt_txt": "2018-06-27 12:00:00"
}, {
"dt": 1530111600,
"main": {
"temp": 302.008,
"temp_min": 302.008,
"temp_max": 302.008,
"pressure": 871.75,
"sea_level": 1016.41,
"grnd_level": 871.75,
"humidity": 33,
"temp_kf": 0
},
"weather": [{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}],
"clouds": {
"all": 0
},
"wind": {
"speed": 0.75,
"deg": 260.003
},
"rain": {},
"sys": {
"pod": "d"
},
"dt_txt": "2018-06-27 15:00:00"
}],
"city": {
"id": 616052,
"name": "Yerevan",
"coord": {
"lat": 40.1776,
"lon": 44.5126
},
"country": "AM",
"population": 1093485
}
}
如何从此列表中提取项目？
我需要使用AESON。
例如，如何提取呢？
{“ temp”：288.89，“ temp_min”：288.89，“ temp_max”：288.89，“压力”：875.39，“ sea_level”：1022.49，“ grnd_level”：875.39，“湿度”：81，“ temp_kf”：0}， “ weather”：[{“ id”：500，“ main”：“ Rain”，“ description”：“ light rain”，“ icon”：“ 10n”}]，“ clouds”：{“ all”：56} ，“ wind”：{“ speed”：1.01，“ deg”：40.0106}，“ rain”：{“ 3h”：0.055}，“ sys”：{“ pod”：“ n”}，“ dt_txt”：“ 2018-06-23 21:00:00“}，{” dt“：1529798400，” main“：
我的代码：
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
module PrepareAnswer where
import Data.Aeson
import qualified Data.ByteString.Lazy as BSL
import Data.Maybe (fromMaybe)
import Data.Text
import Data.Time.Clock
import GHC.Generics
import Network.HTTP.Client
data MainWeatherInfo = MainWeatherInfo
{ mainInfo :: MainInfo
, list :: ListWeatherInfo
} deriving (Show, Generic)
data ListWeatherInfo = ListWeatherInfo
{ temper :: Double
, temp_min :: Double
, temp_max :: Double
, pressure1 :: Double
, sea_level :: Double
, grnd_level :: Double
, humidity :: Int
, temp_kf :: Double
, dt_txt :: UTCTime
} deriving (Show, Generic)
instance ToJSON MainWeatherInfo where
toJSON = genericToJSON defaultOptions { fieldLabelModifier = Prelude.take 4 }
instance FromJSON MainWeatherInfo where
parseJSON = genericParseJSON defaultOptions { fieldLabelModifier = Prelude.take 4 }
instance ToJSON ListWeatherInfo
instance FromJSON ListWeatherInfo
data MainInfo = MainInfo
{ temp :: Double
, pressure :: Int
} deriving ( Show
, Generic
, ToJSON
, FromJSON
)
prepareAnswer :: Response BSL.ByteString -> Text
prepareAnswer response = Data.Text.pack finalPhrase
where
finalPhrase = prepareValues weatherValues
weatherValues = extractValues . responseBody $ response
extractValues :: BSL.ByteString -> MainWeatherInfo
extractValues rawJSON =
let result = decode rawJSON :: Maybe MainWeatherInfo
in fromMaybe (error "Invalid JSON!") result
prepareValues :: MainWeatherInfo -> String
prepareValues (MainWeatherInfo dataWeNeed forecastList) =
"The expected temperature is: "
++ show (temp dataWeNeed )
++ " degrees Celsius, atmospheric pressure is "
++ show (pressure dataWeNeed)
++ " mm/hg"
答案 0 :(得分：0)
您可能想要list :: [ListWeatherInfo]。当前，它期望list是一条记录，但在示例数据中，它是json数组。