解析XML中的日期无法工作

huangapple
go评论125阅读模式
英文:

Parsing date from XML does not work

问题

如果我使用简单的值执行time.Parse()，一切都正常，但解析XML时出现问题。

  1. type customDate struct {
  2.     time.Time
  3. }
  5. func (c *customDate) UnmarshalXml(d *xml.Decoder, start xml.StartElement) error {
  6.     var v string
  7.     if err := d.DecodeElement(&v, &start); err != nil {
  8.         return err
  9.     }
  11.     loc, _ := time.LoadLocation("Europe/Moscow")
  12.     prs, err := time.ParseInLocation("02.01.2006", v, loc)
  13.     if err != nil {
  14.         return err
  15.     }
  17.     *c = customDate{prs}
  18.     return nil
  19. }

在playground上的示例

英文:

If I execute time.Parse() with simple values - then everything is fine, but parsing XML does not.

  1. type customDate struct {
  2. 	time.Time
  3. }
  6. func (c *customDate) UnmarshalXml(d *xml.Decoder, start xml.StartElement) error {
  7. 	var v string
  8. 	if err := d.DecodeElement(&v, &start); err != nil{
  9. 		return err
  10. 	}
  11. 	
  12. 	loc, _ := time.LoadLocation("Europe/Moscow")
  13. 	prs, err := time.ParseInLocation("02.01.2006", v, loc)
  14. 	if err != nil {
  15. 		return err
  16. 	}
  17. 	
  18. 	*c = customDate{prs}
  19. 	return nil
  20. }

example on playground

答案1

得分: 2

date是一个XML属性，而不是元素。因此，您必须实现xml.UnmarshalerAttr接口，而不是xml.Unmarshaler接口：

  1. package main
  3. import (
  4. 	"encoding/xml"
  5. 	"fmt"
  6. 	"time"
  7. )
  9. type xmlSource struct {
  10. 	XMLName xml.Name `xml:"BicDBList"`
  11. 	Base    string   `xml:"Base,attr"`
  12. 	Items   []item   `xml:"item"`
  13. }
  15. // Item代表节点"item"的结构
  16. type item struct {
  17. 	File string     `xml:"file,attr"`
  18. 	Date customDate `xml:"date,attr"`
  19. }
  21. type customDate struct {
  22. 	time.Time
  23. }
  25. func (c *customDate) UnmarshalXMLAttr(attr xml.Attr) error {
  26. 	loc, err := time.LoadLocation("Europe/Moscow")
  27. 	if err != nil {
  28. 		return err
  29. 	}
  30. 	prs, err := time.ParseInLocation("02.01.2006", attr.Value, loc)
  31. 	if err != nil {
  32. 		return err
  33. 	}
  35. 	c.Time = prs
  36. 	return nil
  37. }
  39. var data = []byte(`<BicDBList Base="/mcirabis/BIK/">
  40.     <item file="bik_db_09122016.zip" date="09.12.2016"/>
  41.     <item file="bik_db_08122016.zip" date="08.12.2016"/>
  42.     <item file="bik_db_07122016.zip" date="07.12.2016"/>
  43.     <item file="bik_db_06122016.zip" date="06.12.2016"/>
  44. </BicDBList>`)
  46. func main() {
  47. 	var sample xmlSource
  49. 	err := xml.Unmarshal(data, &sample)
  51. 	if err != nil {
  52. 		println(err.Error())
  53. 	}
  54. 	fmt.Printf("%#v\n", sample)
  55. }

您可以在这里找到完整的代码示例。

英文:

date is an XML attribute, not an element. Therefore, you must implement the xml.UnmarshalerAttr interface rather than xml.Unmarshaler:

  1. package main
  3. import (
  4. 	&quot;encoding/xml&quot;
  5. 	&quot;fmt&quot;
  6. 	&quot;time&quot;
  7. )
  9. type xmlSource struct {
  10. 	XMLName xml.Name `xml:&quot;BicDBList&quot;`
  11. 	Base    string   `xml:&quot;Base,attr&quot;`
  12. 	Items   []item   `xml:&quot;item&quot;`
  13. }
  15. // Item represent structure of node &quot;item&quot;
  16. type item struct {
  17. 	File string     `xml:&quot;file,attr&quot;`
  18. 	Date customDate `xml:&quot;date,attr&quot;`
  19. }
  21. type customDate struct {
  22. 	time.Time
  23. }
  25. func (c *customDate) UnmarshalXMLAttr(attr xml.Attr) error {
  26. 	loc, err := time.LoadLocation(&quot;Europe/Moscow&quot;)
  27. 	if err != nil {
  28. 		return err
  29. 	}
  30. 	prs, err := time.ParseInLocation(&quot;02.01.2006&quot;, attr.Value, loc)
  31. 	if err != nil {
  32. 		return err
  33. 	}
  35. 	c.Time = prs
  36. 	return nil
  37. }
  39. var data = []byte(`&lt;BicDBList Base=&quot;/mcirabis/BIK/&quot;&gt;
  40.     &lt;item file=&quot;bik_db_09122016.zip&quot; date=&quot;09.12.2016&quot;/&gt;
  41.     &lt;item file=&quot;bik_db_08122016.zip&quot; date=&quot;08.12.2016&quot;/&gt;
  42.     &lt;item file=&quot;bik_db_07122016.zip&quot; date=&quot;07.12.2016&quot;/&gt;
  43.     &lt;item file=&quot;bik_db_06122016.zip&quot; date=&quot;06.12.2016&quot;/&gt;
  44. &lt;/BicDBList&gt;`)
  46. func main() {
  47. 	var sample xmlSource
  49. 	err := xml.Unmarshal(data, &amp;sample)
  51. 	if err != nil {
  52. 		println(err.Error())
  53. 	}
  54. 	fmt.Printf(&quot;%#v\n&quot;, sample)
  55. }

https://play.golang.org/p/U56qfEOe-A

huangapple
  • 本文由 发表于 2016年12月14日 21:01:59
  • 转载请务必保留本文链接：https://go.coder-hub.com/41143350.html
  • date
  • go
  • xml
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