英文:
Unmarshaling values of JSON objects
问题
可以使用Go的json包来获取edittoken。首先，需要将给定的字符串解析为JSON对象。然后，可以使用点操作符来访问嵌套的属性，以获取edittoken的值。以下是示例代码：
package main
import (
"encoding/json"
"fmt"
)
func main() {
str := `{
"query": {
"pages": {
"66984": {
"pageid": 66984,
"ns": 0,
"title": "Main Page",
"touched": "2012-11-23T06:44:22Z",
"lastrevid": 1347044,
"counter": "",
"length": 28,
"redirect": "",
"starttimestamp": "2012-12-15T05:21:21Z",
"edittoken": "bd7d4a61cc4ce6489e68c21259e6e416+\""
}
}
}
}`
var data map[string]interface{}
err := json.Unmarshal([]byte(str), &data)
if err != nil {
fmt.Println("Error:", err)
return
}
edittoken := data["query"].(map[string]interface{})["pages"].(map[string]interface{})["66984"].(map[string]interface{})["edittoken"].(string)
fmt.Println("edittoken:", edittoken)
}
请注意，上述代码假设给定的字符串是有效的JSON，并且edittoken属性始终存在于相应的位置。如果JSON结构发生变化，代码可能需要进行相应的调整。
英文:
If given the string, from a MediaWiki API request:
str = ` {
"query": {
"pages": {
"66984": {
"pageid": 66984,
"ns": 0,
"title": "Main Page",
"touched": "2012-11-23T06:44:22Z",
"lastrevid": 1347044,
"counter": "",
"length": 28,
"redirect": "",
"starttimestamp": "2012-12-15T05:21:21Z",
"edittoken": "bd7d4a61cc4ce6489e68c21259e6e416+\\"
}
}
}
}`
What can be done to get the edittoken, using Go's json package (keep in mind the 66984 number will continually change)?
答案1
得分: 5
当你有一个像这样的变化的键时，处理它的最好方法是使用一个映射。在下面的示例中，我使用了结构体，直到我们达到一个变化的键的点。然后我在那之后切换到了映射格式。我也链接了一个可工作的示例。
http://play.golang.org/p/ny0kyafgYO
package main
import (
"fmt"
"encoding/json"
)
type query struct {
Query struct {
Pages map[string]interface{}
}
}
func main() {
str := `{"query":{"pages":{"66984":{"pageid":66984,"ns":0,"title":"Main Page","touched":"2012-11-23T06:44:22Z","lastrevid":1347044,"counter":"","length":28,"redirect":"","starttimestamp":"2012-12-15T05:21:21Z","edittoken":"bd7d4a61cc4ce6489e68c21259e6e416+\"}}}}`
q := query{}
err := json.Unmarshal([]byte(str), &q)
if err != nil {
panic(err)
}
for _, p := range q.Query.Pages {
fmt.Printf("edittoken = %s\n", p.(map[string]interface{})["edittoken"].(string))
}
}
英文:
When you have a changing key like this the best way to deal with it is with a map. In the example below I've used structs up until the point we reach a changing key. Then I switched to a map format after that. I linked up a working example as well.
http://play.golang.org/p/ny0kyafgYO
package main
import (
"fmt"
"encoding/json"
)
type query struct {
Query struct {
Pages map[string]interface{}
}
}
func main() {
str := `{"query":{"pages":{"66984":{"pageid":66984,"ns":0,"title":"Main Page","touched":"2012-11-23T06:44:22Z","lastrevid":1347044,"counter":"","length":28,"redirect":"","starttimestamp":"2012-12-15T05:21:21Z","edittoken":"bd7d4a61cc4ce6489e68c21259e6e416+\\"}}}}`
q := query{}
err := json.Unmarshal([]byte(str), &q)
if err!=nil {
panic(err)
}
for _, p := range q.Query.Pages {
fmt.Printf("edittoken = %s\n", p.(map[string]interface{})["edittoken"].(string))
}
}
答案2
得分: 4
请注意，如果您在API请求URL中使用&indexpageids=true参数，结果将包含一个名为“pageids”的数组，如下所示：
str = ` {
"query": {
"pageids": [
"66984"
],
"pages": {
"66984": {
"pageid": 66984,
"ns": 0,
"title": "Main Page",
"touched": "2012-11-23T06:44:22Z",
"lastrevid": 1347044,
"counter": "",
"length": 28,
"redirect": "",
"starttimestamp": "2012-12-15T05:21:21Z",
"edittoken": "bd7d4a61cc4ce6489e68c21259e6e416+\\"
}
}
}
}`
因此，您可以使用pageids[0]来访问不断变化的数字，这可能会使事情变得更容易。
英文:
Note that if you use the &indexpageids=true parameter in the API request URL, the result will contain a "pageids" array, like so:
str = ` {
"query": {
"pageids": [
"66984"
],
"pages": {
"66984": {
"pageid": 66984,
"ns": 0,
"title": "Main Page",
"touched": "2012-11-23T06:44:22Z",
"lastrevid": 1347044,
"counter": "",
"length": 28,
"redirect": "",
"starttimestamp": "2012-12-15T05:21:21Z",
"edittoken": "bd7d4a61cc4ce6489e68c21259e6e416+\\"
}
}
}
}`
so you can use pageids[0] to access the continually changing number, which will likely make things easier.
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