How to parse partial objects inside Json

huangapple
go评论121阅读模式
英文:

How to parse partial objects inside Json

问题

我有以下的Json结构，我想解析对象内部的key字段。有没有可能在不映射完整结构的情况下做到这一点？

  1. {
  2.   "Records": [
  3.     {
  4.       "eventVersion": "2.0",
  5.       "s3": {
  6.         "s3SchemaVersion": "1.0",
  7.         "configurationId": "my-event",
  8.         "bucket": {
  9.           "name": "super-files",
  10.           "ownerIdentity": {
  11.             "principalId": "41123123"
  12.           },
  13.           "arn": "arn:aws:s3:::myqueue"
  14.         },
  15.         "object": {
  16.           "key": "/events/mykey",
  17.           "size": 502,
  18.           "eTag": "091820398091823",
  19.           "sequencer": "1123123"
  20.         }
  21.       }
  22.     }
  23.   ]
  24. }

// 只想返回Key的值
type Object struct {
Key string json:"key"
}

英文:

I have the Json structure below, and i'm trying to parse only the key field inside the object. It's possible to do it without mapping the complete structure?

  1. {
  2.  "Records":[
  3.   {
  4.      "eventVersion":"2.0",
  5.      "s3":{
  6.         "s3SchemaVersion":"1.0",
  7.         "configurationId":"my-event",
  8.         "bucket":{
  9.            "name":"super-files",
  10.            "ownerIdentity":{
  11.               "principalId":"41123123"
  12.            },
  13.            "arn":"arn:aws:s3:::myqueue"
  14.         },
  15.         "object":{
  16.            "key":"/events/mykey",
  17.            "size":502,
  18.            "eTag":"091820398091823",
  19.            "sequencer":"1123123"
  20.          }
  21.        }
  22.     }
  23.   ]
  24. }
  26. // Want to return only the Key value
  27. type Object struct {
  28.    Key string `json:"key"`
  29. }

答案1

得分: 3

有几个第三方的JSON库非常快速，可以从JSON字符串中提取特定的值。

库：

GJSON示例：

  1. const json = `your json string`
  3. func main() {
  4.     keys := gjson.Get(json, "Records.#.s3.object.key")
  5.     // 返回所有记录的键的切片
  7.     singleKey := gjson.Get(json, "Records.1.s3.object.key")
  8.     // 只返回第一条记录的键
  9. }
英文:

There are a few 3rd party json libraries which are very fast at extracting only some values from your json string.

Libraries:

GJSON example:

  1. const json = `your json string`
  3. func main() {
  4.     keys := gjson.Get(json, "Records.#.s3.object.key")
  5.     // would return a slice of all records' keys
  7.     singleKey := gjson.Get(json, "Records.1.s3.object.key")
  8.     // would only return the key from the first record
  9. }

答案2

得分: 2

对象是S3的一部分，所以我创建了以下结构体，并且能够读取键值。

  1. type Root struct {
  2.     Records []Record `json:"Records"`
  3. }
  5. type Record struct {
  6.     S3 SS3 `json:"s3"`
  7. }
  9. type SS3 struct {
  10.     Obj Object `json:"object"`
  11. }
  13. type Object struct {
  14.     Key string `json:"key"`
  15. }
英文:

Object is part of S3, so I created struct as below and I was able to read key

  1. type Root struct {
  2. 	Records []Record `json:"Records"`
  3. }
  6. type Record struct {
  7. 	S3 SS3 `json:"s3"`
  8. }
  10. type SS3 struct {
  11. 	Obj Object `json:"object"`
  12. }
  14. type Object struct {
  15. 	Key string `json:"key"`
  16. }

huangapple
  • 本文由 发表于 2017年8月24日 11:19:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/45852398.html
  • go
  • json
  • parsing
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