断言

func GetInterfaceToString(value interface{}) string {
    // interface 转 string
    var key string
    if value == nil {
        return key
    }
 
    switch value.(type) {
    case float64:
        ft := value.(float64)
        key = strconv.FormatFloat(ft, 'f', -1, 64)
    case float32:
        ft := value.(float32)
        key = strconv.FormatFloat(float64(ft), 'f', -1, 64)
    case int:
        it := value.(int)
        key = strconv.Itoa(it)
    case uint:
        it := value.(uint)
        key = strconv.Itoa(int(it))
    case int8:
        it := value.(int8)
        key = strconv.Itoa(int(it))
    case uint8:
        it := value.(uint8)
        key = strconv.Itoa(int(it))
    case int16:
        it := value.(int16)
        key = strconv.Itoa(int(it))
    case uint16:
        it := value.(uint16)
        key = strconv.Itoa(int(it))
    case int32:
        it := value.(int32)
        key = strconv.Itoa(int(it))
    case uint32:
        it := value.(uint32)
        key = strconv.Itoa(int(it))
    case int64:
        it := value.(int64)
        key = strconv.FormatInt(it, 10)
    case uint64:
        it := value.(uint64)
        key = strconv.FormatUint(it, 10)
    case string:
        key = value.(string)
    case time.Time:
        t, _ := value.(time.Time)
        key = t.String()
        // 2022-11-23 11:29:07 +0800 CST  这类格式把尾巴去掉
        key = strings.Replace(key, " +0800 CST", "", 1)
        key = strings.Replace(key, " +0000 UTC", "", 1)
    case []byte:
        key = string(value.([]byte))
    default:
        newValue, _ := json.Marshal(value)
        key = string(newValue)
    }
 
    return key
}

强转

str := fmt.Sprintf("%v", test) //强转为string