英文:
Why do I convert map to json, map includes list values which is nothing after converting to json
问题
func Test_JsonTtransfer(t *testing.T) {
uid := "306"
phoneList := list.New()
phoneList.PushBack("18513622928")
fmt.Println("phoneList=======", phoneList.Len())
jsonPhoneList, err := json.Marshal(phoneList)
if err != nil {
fmt.Println("error:", err)
}
fmt.Println("jsonPhoneList=======", string(jsonPhoneList))
idCardList := list.New()
idCardList.PushBack("230405197608040640")
request := make(map[string]interface{})
request["uid"] = uid
request["phones"] = phoneList
request["id_cards"] = idCardList
json, err := json.Marshal(request)
if err != nil {
fmt.Println("error:", err)
}
fmt.Println("json=======", json)
fmt.Println("json=======", string(json))
}
输出：
D:/Sys/server/Go\bin\go.exe test -v golang-test/com/http/test -run ^Test_JsonTtransfer$
phoneList======= 1
jsonPhoneList======= {}
json======= [123 34 105 100 95 99 97 114 100 115 34 58 123 125 44 34 112 104 111 110 101 115 34 58 123 125 44 34 117 105 100 34 58 34 51 48 54 34 125]
json======= {"id_cards":{},"phones":{},"uid":"306"}
ok golang-test/com/http/test 0.482s
Phones应该是列表值，但是为空。帮我看看。
英文:
func Test_JsonTtransfer(t *testing.T) {
uid := "306"
phoneList := list.New()
phoneList.PushBack("18513622928")
fmt.Println("phoneList=======", phoneList.Len())
jsonPhoneList, err := json.Marshal(phoneList)
if err != nil {
fmt.Println("error:", err)
}
fmt.Println("jsonPhoneList=======", string(jsonPhoneList))
idCardList := list.New()
idCardList.PushBack("230405197608040640")
request := make(map[string]interface{})
request["uid"] = uid
request["phones"] = phoneList
request["id_cards"] = idCardList
json, err := json.Marshal(request)
if err != nil {
fmt.Println("error:", err)
}
fmt.Println("json=======", json)
fmt.Println("json=======", string(json))
}
Output:
>D:/Sys/server/Go\bin\go.exe test -v golang-test/com/http/test -run ^Test_JsonTtransfer$
>phoneList======= 1
>jsonPhoneList======= {}
>json======= [123 34 105 100 95 99 97 114 100 115 34 58 123 125 44 34 112 104 111 110 101 115 34 58 123 125 44 34 117 105 100 34 58 34 51 48 54 34 125]
>json======= {"id_cards":{},"phones":{},"uid":"306"}
>ok golang-test/com/http/test 0.482s
Phones should be list values, but nothing. Help me.
答案1
得分: 1
因为List类型没有导出的字段，并且该类型没有实现Marshaler接口，所以List值始终会被编组为文本{}。
一个简单的修复方法是使用切片而不是列表：
var phoneList []string
phoneList = append(phoneList, "18513622928")
fmt.Println("phoneList=======", len(phoneList))
英文:
Because the List type has no exported fields and the type does not implement the Marshalerinterface, List values always marshal to the text {}.
A simple fix is to use a slice instead of a list:
var phoneList []string
phoneList = append(phoneList, "18513622928")
fmt.Println("phoneList=======", len(phoneList)
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