将interface{}转换为map。

huangapple
go评论111阅读模式
英文:

Convert interface{} to map

问题

我正在尝试读取一个 JSON 文件，代码如下：

  1. var configurations map[string]interface{}
  3. func GetConfigMap(name string) interface{} {
  4.     valueMap := configurations[name]
  5.     return valueMap.(map[string]interface{})
  6. }

我尝试按以下方式读取 map：

  1. glossary := jsonreader.GetConfigMap("glossary")
  2. fmt.Println(glossary["GlossDiv"])

JSON 结构如下：

  1. {
  2.     "glossary": {
  3.         "title": "example glossary",
  4.         "GlossDiv": {
  5.             "title": "S",
  6.             "GlossList": {
  7.                 "GlossEntry": {
  8.                     "ID": "SGML",
  9.                     "SortAs": "SGML",
  10.                     "GlossTerm": "Standard Generalized Markup Language",
  11.                     "Acronym": "SGML",
  12.                     "Abbrev": "ISO 8879:1986",
  13.                     "GlossDef": {
  14.                         "para": "A meta-markup language, used to create markup languages such as DocBook.",
  15.                         "GlossSeeAlso": ["GML", "XML"]
  16.                     },
  17.                     "GlossSee": "markup"
  18.                 }
  19.             }
  20.         }
  21.     }
  22. }

我得到了一个异常，提示说：

  1. invalid operation: glossary["GlossDiv"] (type interface {} does not support indexing)

我该如何解决这个问题？

英文:

I am trying to read a json file, the code that does that has something like below

  1. var configurations map[string]interface{}
  3. func GetConfigMap(name string) interface{} {
  4. 	valueMap := configurations[name]
  5. 	return valueMap.(map[string]interface{})
  6. }

And I am trying to read the map as below,

  1. glossary := jsonreader.GetConfigMap("glossary")
  2. fmt.Println(glossary["GlossDiv"])

The json structure is as below,

  1. {    "glossary": {
  2.         "title": "example glossary",
  3. 		"GlossDiv": {
  4.             "title": "S",
  5. 			"GlossList": {
  6.                 "GlossEntry": {
  7.                     "ID": "SGML",
  8. 					"SortAs": "SGML",
  9. 					"GlossTerm": "Standard Generalized Markup Language",
  10. 					"Acronym": "SGML",
  11. 					"Abbrev": "ISO 8879:1986",
  12. 					"GlossDef": {
  13.                         "para": "A meta-markup language, used to create markup languages such as DocBook.",
  14. 						"GlossSeeAlso": ["GML", "XML"]
  15.                     },
  16. 					"GlossSee": "markup"
  17.                 }
  18.             }
  19.         }
  20.     }
  21. }

I am getting an exception that says -

  1. invalid operation: glossary["GlossDiv"] (type interface {} does not support indexing)

How do I make this work?

答案1

得分: 2

根据你的问题，我不确定你想要做什么，但是你可以改变函数的返回类型，不是吗？

  1. func GetConfigMap(name string) map[string]interface{} {
  2.     valueMap := configurations[name]
  3.     return valueMap.(map[string]interface{})
  4. }

你可以将函数的返回类型改为 map[string]interface{}。

英文:

I'm not sure what you're trying to do based on your question, but can't you just change the return type of the function?

  1. func GetConfigMap(name string) map[string]interface{} {
  2.     valueMap := configurations[name]
  3.     return valueMap.(map[string]interface{})
  4. }

huangapple
  • 本文由 发表于 2014年11月20日 11:16:39
  • 转载请务必保留本文链接：https://go.coder-hub.com/27031129.html
  • dictionary
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  • interface
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