您的ParseResponse函数存在问题，您正在调用json.Unmarshal作为第一个参数传递json，这是一个包名称：这是模棱两可的。
如您所见，您的代码在更改ParseResponse函数时运行良好。
package main
import (
"encoding/json"
"fmt"
)
type gateway struct {
Characteristics []string `json:"characteristics"`
CreatedAt string `json:"created_at"`
Credentials []interface{} `json:"credentials"`
Description interface{} `json:"description"`
GatewaySpecificFields []interface{} `json:"gateway_specific_fields"`
GatewayType string `json:"gateway_type"`
Name string `json:"name"`
PaymentMethods []string `json:"payment_methods"`
Redacted bool `json:"redacted"`
State string `json:"state"`
Token string `json:"token"`
UpdatedAt string `json:"updated_at"`
}
type gateways struct {
Gateways []gateway `json:"gateways"`
}
func ParseResponse(js []byte) {
var parsed gateways
json.Unmarshal(js, &parsed)
fmt.Println(parsed)
}
func main() {
var js []byte = []byte(`{
"gateways": [
{
"token": "my_token_here",
"gateway_type": "test",
"description": null,
"payment_methods": [
"credit_card",
"sprel",
"third_party_token",
"bank_account",
"apple_pay"
],
"state": "retained",
"created_at": "2016-03-12T18:52:37Z",
"updated_at": "2016-03-12T18:52:37Z",
"name": "Spreedly Test",
"characteristics": [
"purchase",
"authorize",
"capture",
"credit",
"general_credit",
"void",
"verify",
"reference_purchase",
"purchase_via_preauthorization",
"offsite_purchase",
"offsite_authorize",
"3dsecure_purchase",
"3dsecure_authorize",
"store",
"remove",
"disburse",
"reference_authorization"
],
"credentials": [],
"gateway_specific_fields": [],
"redacted": false
}
]
}`)
/*
var parsed gateways
e := json.Unmarshal(js, &parsed)
if e != nil {
fmt.Println(e.Error())
} else {
fmt.Println(parsed)
}
*/
ParseResponse(js)
}
输出：
{[{[purchase authorize capture credit general_credit void verify reference_purchase purchase_via_preauthorization offsite_purchase offsite_authorize 3dsecure_purchase 3dsecure_authorize store remove disburse reference_authorization] 2016-03-12T18:52:37Z [] <nil> [] test Spreedly Test [credit_card sprel third_party_token bank_account apple_pay] false retained my_token_here 2016-03-12T18:52:37Z}]}