英文:
json: error calling MarshalJSON for type main.Time: invalid character '-' after top-level value
问题
我打算将time.Time序列化为UTC时区并使用RFC3339格式。所以我创建了一个名为Time的自定义数据类型，它嵌入了time.Time。
当尝试使用json.Marshal对这个数据进行编组时，我得到以下错误：
json: error calling MarshalJSON for type main.Time: invalid character '-' after top-level value
我有两个问题：
- 为什么上面的代码会报错？
- 这是在API中将
time.Time序列化和反序列化为所需格式的正确方法吗？
谢谢！
英文:
I intent to serialize time.Time to have UTC timezone and in RFC3339 format.
So I created following custom data type called Time that embeds time.Time.
package mainimport ("encoding/json""time")type Time struct {time.Time}func (t *Time) UnmarshalJSON(b []byte) error {ret, err := time.Parse(time.RFC3339, string(b))if err != nil {return err}*t = Time{ret}return nil}func (t Time) MarshalJSON() ([]byte, error) {return []byte(t.UTC().Format(time.RFC3339)), nil}func main() {type User struct {CreatedAt Time `json:"created_at"`}user := User{CreatedAt: Time{time.Now()}}_, err := json.Marshal(user)if err != nil {panic(err)}}
When this data is tried to marshal with json.Marshal I get following error
json: error calling MarshalJSON for type main.Time: invalid character '-' after top-level value
I have 2 queries
- Why above code is throwing the error?
- Is this the right way to serialise and deserialise
time.Timeto and from a desired format in an API
Thanks in advance!
答案1
得分: 4
文本2009-11-10T23:00:00Z不是有效的JSON值，但"2009-11-10T23:00:00Z"是。请注意引号。
使用以下函数将时间格式化为JSON字符串。
func (t Time) MarshalJSON() ([]byte, error) {b := make([]byte, 0, len(time.RFC3339)+2)b = append(b, '"')b = t.AppendFormat(b, time.RFC3339)b = append(b, '"')return b, nil}
英文:
The text 2009-11-10T23:00:00Z is not a valid JSON value, but "2009-11-10T23:00:00Z" is. Note the quotes.
Use the following function to format Time as a JSON string.
func (t Time) MarshalJSON() ([]byte, error) {b := make([]byte, 0, len(time.RFC3339)+2)b = append(b, '"')b = t.AppendFormat(b, time.RFC3339)b = append(b, '"')return b, nil}
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