Question

发现去json解码是一个很大的痛苦，所以请帮忙。这是我的json：

 {  
   "BTC_BCN":{  
      "id":7,
      "last":"0.00000156",
      "lowestAsk":"0.00000156",
      "highestBid":"0.00000155",
      "percentChange":"0.01960784",
      "baseVolume":"4920.84786257",
      "quoteVolume":"3016048494.19305944",
      "isFrozen":"0",
      "high24hr":"0.00000183",
      "low24hr":"0.00000145"
   },
   "BTC_BELA":{  
      "id":8,
      "last":"0.00008847",
      "lowestAsk":"0.00008848",
      "highestBid":"0.00008847",
      "percentChange":"-0.00405268",
      "baseVolume":"169.66498061",
      "quoteVolume":"1981232.44495809",
      "isFrozen":"0",
      "high24hr":"0.00008995",
      "low24hr":"0.00008120"
   }, ...
}

所以我需要把它放在我创建的类型中

//Crypto is the currency object
type Crypto struct {
    iso           string //this is the key (ex: BTC_BCN)
    id            int
    last          float64
    lowestAsk     float64
    highestBid    float64
    percentChange float64
    baseVolume    float64
    quoteVolume   float64
    isFrozen      int
    high24hr      float64
    low24hr       float64
}

这是我到目前为止所做的，但我最终得到了键和空值

func main() {
    // sendEmail("Some text")
    currencies := getCurrencies()
    if currencies == nil {
        return
    }
    fmt.Println(len(currencies))

}

func getCurrencies() map[string]Crypto {
    curList := make(map[string]Crypto)
    resp, err := http.Get("https://poloniex.com/public?command=returnTicker")
    // fmt.Println(err)
    if err != nil {
        sendEmail("Error getting data from poloniex " + err.Error())
        return nil
    }
    body, readErr := ioutil.ReadAll(resp.Body)
    reader := strings.NewReader(string(body))
    jsonErr := json.NewDecoder(reader).Decode(&curList)
    // fmt.Printf("curList is : %#v\n", curList)
    // fmt.Printf("body is : %s\n", string(body))
    if readErr != nil {
        fmt.Printf("readErr: %s\n", readErr.Error())
    }
    if jsonErr != nil {
        fmt.Printf("jsonErr: %s\n", jsonErr.Error())
    }
    for k, v := range curList {
        fmt.Println("k:", k, "v:", v)
    }
    defer resp.Body.Close()
    return curList
}

输出：

k: BTC_MAID v: {0 0 0 0 0 0 0 0 0 0}
k: BTC_NOTE v: {0 0 0 0 0 0 0 0 0 0}
k: BTC_VRC v: {0 0 0 0 0 0 0 0 0 0}
k: BTC_DOGE v: {0 0 0 0 0 0 0 0 0 0}...

请原谅我的愚蠢问题，但我花了好几天时间，我想我错过了一些东西。欢呼声。

Answer 1

//Crypto is the currency object
type Crypto struct {
    Iso           string //this is the key (ex: BTC_BCN)
    Id            int
    Last          string
    LowestAsk     string
    HighestBid    string
    PercentChange string
    BaseVolume    string
    QuoteVolume   string
    IsFrozen      int
    High24hr      string
    Low24hr       string
}

您需要通过大写第一个字符来导出字段。最重要的是，您的float64数据类型为string，因此您可以在分配给对象Crypto之前将其读作字符串或格式。

<强>更新

正如@skomp所指出的，您可以使用标记来注释您从json文件接收的类型。

type Crypto struct {
    CryptoKey
    Id            int
    Last          float64 `json:"last,string"`
    LowestAsk     float64 `json:"lowestAsk,string"`
    HighestBid    float64 `json:"highestBid,string"`
    PercentChange float64 `json:"percentChange,string"`
    BaseVolume    float64 `json:"baseVolume,string"`
    QuoteVolume   float64 `json:"quoteVolume,string"`
    IsFrozen      int
    High24hr      float64 `json:"high24hr,string"`
    Low24hr       float64 `json:"low24hr,string"`
}

Answer 2

您正在尝试解码到包含加密对象的地图。这是不正确的。在结构定义中创建映射，如下所示：

type Crypto struct {
    iso           string  `json:"BTC_BCN"` //this is the key (ex: BTC_BCN)
    id            int     `json:"id"`
    last          float64 `json:"las"`
    ...
}

crypto := &Crypto{}
err = json.NewDecoder(reader).Decode(crypto)

去解码json字符串

2 个答案: