英文:
Unmarshal JSON nested field values into struct fields
问题
给定以下结构体：
type MyStruct struct {
First string
Second string
Third string
}
我想将以下JSON解组成MyStruct，如下所示：
bytes := []byte(`{ "first": { "href":"http://some/resources/1" },
"second": { "href":"http://http://some/resources/2" },
"third": { "href":"http://some/resources/3" } }`)
var s MyStruct
err := json.Unmarshal(bytes, &s)
fmt.Println(s.First)
// 我该如何使其返回"http://some/resources/1"而不是"map[href:http://some resources/1]"？
我想要的是一种将go字段标签与实际的JSON对象表示法结合在一起的方式，我可以像这样声明MyStruct：
type MyStruct struct {
First string `json:"first.href"`
Second string `json:"second.href"`
Third string `json:"third.href"`
}
有什么想法吗？
英文:
// Given the following struct:
type MyStruct struct {
First string
Second string
Third string
}
// I would like to unmarshal the following JSON into MyStruct such as:
bytes := []byte({ { "first": { "href":"http://some/resources/1" },
"second": { "href":"http://http://some/resources/2" },
"third": { "href":"http://some/resources/3" } })
var s MyStruct
err := json.Unmarshal(bytes, &s)
fmt.Println(s.First)
// how do I make this return "http://some/resources/1" instead of
// "map[href:http://some resources/1]"?
What I'm looking for is something like a combination of go field tags with actual JSON object notation where I would be able to declare MyStruct like this:
type MyStruct struct {
First string `json:"first.href"`
Second string `json:"second.href"`
Third string `json:"third.href"`
}
Any ideas?
答案1
得分: 1
json包不支持访问嵌套字段的方法（不像encoding/xml）。因此，你要么需要编写自己的Unmarshal函数（参见：Go中的JSON解码），要么使用访问器封装字段。
英文:
The json package doesn't support a way to access nested fields (unlike encoding/xml). So you will either have to write you own Unmarshal function (see: JSON decoding in go) or encapsulate the fields with accessors.
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