dongmo3413 2013-06-25 15:16
浏览 318
已采纳

Golang XML Unmarshal和time.Time字段

I have XML data I am retrieving via a REST API that I am unmarshal-ing into a GO struct. One of the fields is a date field, however the date format returned by the API does not match the default time.Time parse format and thus the unmarshal fails.

Is there any way to specify to the unmarshal function which date format to use in the time.Time parsing? I'd like to use properly defined types and using a string to hold a datetime field feels wrong.

Sample struct:

type Transaction struct {

    Id int64 `xml:"sequencenumber"`
    ReferenceNumber string `xml:"ourref"`
    Description string `xml:"description"`
    Type string `xml:"type"`
    CustomerID string `xml:"namecode"`
    DateEntered time.Time `xml:"enterdate"` //this is the field in question
    Gross float64 `xml:"gross"`
    Container TransactionDetailContainer `xml:"subfile"`
}

The date format returned is "yyyymmdd".

  • 写回答

4条回答 默认 最新

  • duangan4070 2014-07-29 12:24
    关注

    I had the same problem.

    time.Time doesn't satisfy the xml.Unmarshaler interface. And you can not specify a date fomat.

    If you don't want to handle the parsing afterward and you prefer to let the xml.encoding do it, one solution is to create a struct with an anonymous time.Time field and implement your own UnmarshalXML with your custom date format.

    type Transaction struct {
        //...
        DateEntered     customTime     `xml:"enterdate"` // use your own type that satisfies UnmarshalXML
        //...
    }
    
    type customTime struct {
        time.Time
    }
    
    func (c *customTime) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
        const shortForm = "20060102" // yyyymmdd date format
        var v string
        d.DecodeElement(&v, &start)
        parse, err := time.Parse(shortForm, v)
        if err != nil {
            return err
        }
        *c = customTime{parse}
        return nil
    }
    

    If your XML element uses an attribut as a date, you have to implement UnmarshalXMLAttr the same way.

    See http://play.golang.org/p/EFXZNsjE4a

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(3条)

报告相同问题?