英文:
How can I parse JSON in GoLang if nested content uses dynamic keys?
问题
我从客户端API收到了下面的JSON，但我在获取嵌套的JSON内容方面遇到了困难。如果内部键是动态的，我该如何解析它？
const jsonStream = `
{
"items": {
"bvu62fu6dq": {
"name": "john",
"age": 23,
"xyz": "weu33s"
},
"iaxdw23fq": {
"name": "kelly",
"age": 21,
"xyz": "weu33s"
}
}
}`
我尝试了以下方法，通过循环映射来从上述JSON字符串中提取name和age的值；但它返回了一个带有nil值的映射作为结果。
type Person struct {
Name string `json:"name"`
Age int `json:"age"`
}
type Item struct {
Contact struct {
Info map[string]Person
} `json:"items"`
}
func main() {
dec := json.NewDecoder(strings.NewReader(jsonStream))
for {
var item Item
if err := dec.Decode(&item); err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
fmt.Printf("%s\n", item.Contact.Info["bvu62fu6dq"].Name)
}
}
你可以在goplayground上查看我尝试的代码。
英文:
I received JSON below from a client API but i am struggling to get nested JSON content. How can I parse it if the inner keys are dynamic?
const jsonStream = `
{
"items": {
"bvu62fu6dq": {
"name": "john",
"age": 23,
"xyz": "weu33s"
},
"iaxdw23fq": {
"name": "kelly",
"age": 21,
"xyz": "weu33s"
}
}
}`
This is what i have tried below by looping the map to extract the value of name and age from above JSON string; but it returns map with nil value as a result.
goplaygound
type Person struct {
Name string `json:"name"`
Age int `json:"age"`
}
type Item struct {
Contact struct {
Info map[string]Person
} `json:"items"`
}
func main() {
dec := json.NewDecoder(strings.NewReader(jsonStream))
for {
var item Item
if err := dec.Decode(&item); err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
fmt.Printf("%s\n", item.Contact.Info["bvu62fu6dq"].Name)
}
}
答案1
得分: 6
尝试使用这个替代方案，看起来你只是错误地设置了你的结构：
http://play.golang.org/p/VRKbv-GVQB
你需要解析整个 JSON 字符串，它是一个包含一个名为 items 的单个元素的对象。items 然后包含一个 string 到 Person 对象的映射。
如果你只想从每个人中提取 name 和 age，你可以通过获取 data.Items["bvu62fu6dq"].Name 来实现。
如果你想在 Person 中使用动态键，你需要使用 map[string]interface{} 而不是 Person，以便再次捕获动态键。它可能会像这样：
type Data struct {
Items map[string]map[string]interface{} `json:"items"`
}
...
fmt.Printf("%v\n", data.Items["bvu62fu6dq"]["name"])
fmt.Printf("%v\n", data.Items["bvu62fu6dq"]["age"])
fmt.Printf("%v\n", data.Items["bvu62fu6dq"]["xyz"])
英文:
Try this instead, looks like you just have your structure set up incorrectly:
http://play.golang.org/p/VRKbv-GVQB
You need to parse the entire json string, which is an object that contains a single element named items. items then contains a map of string -> Person objects.
If you only want to extract name and age from each person, you do it by grabbing data.Items["bvu62fu6dq"].Name.
If you want dynamic keys inside the Person, you'll need to do map[string]interface{} instead of Person in order to capture the dynamic keys again. It would look something like:
type Data struct {
Items map[string]map[string]interface{} `json:"items"`
}
...
fmt.Printf("%v\n", data.Items["bvu62fu6dq"]["name"]
fmt.Printf("%v\n", data.Items["bvu62fu6dq"]["age"]
fmt.Printf("%v\n", data.Items["bvu62fu6dq"]["xyz"]
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