Golang中interface类型转string类型

// Strval 获取变量的字符串值
// 浮点型 3.0将会转换成字符串3, "3"
// 非数值或字符类型的变量将会被转换成JSON格式字符串
func Strval(value interface{}) 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 []byte:
        key = string(value.([]byte))
    default:
        newValue, _ := json.Marshal(value)
        key = string(newValue)
    }

    return key
}