如何解码以下 JSON 数据？

huangapple
go评论112阅读模式
英文:

How do I decode the following JSON?

问题

我有一个格式为JSON的对象：

  1. {
  2.   "results": [
  3.     {
  4.       "hits": [
  5.         {
  6.           "title": "Juliette DELAUNAY",
  7.           "author:url": "abc.com"
  8.         }
  9.       ]
  10.     }
  11.   ]
  12. }

为了在我的Go程序中解码它，我创建了以下结构体：

  1. type results struct {
  2.     Result []result `json:"results"`
  3. }
  5. type result struct {
  6.     Hits []hit `json:"hits"`
  7. }
  9. type hit struct {
  10.     Name string `json:"title"`
  11.     Url  string `json:"author:url"`
  12. }
  13. var m = make(map[string]string)
  14. var t results

但是当我尝试执行以下操作时：

  1. decoder := json.NewDecoder(resp.Body)
  2. err = decoder.Decode(&t)
  3. if err != nil {
  4.     fmt.Println(err)
  5. }
  7. for _, x := range t.Result[0].Hits {
  8.     m[x.Name] = x.Url
  9.     fmt.Println(x.Name, x.Url)
  10. }

它会报运行时错误，提示索引超出范围。我做错了什么？我的结构体对给定的JSON是否不正确？

编辑：我需要解码的JSON文件如下：

  1. var jsonStr = []byte(`{"requests":[{"indexName":"recherchepepitesAtoZ","params":"query=x&hitsPerPage=2817&maxValuesPerFacet=42&page=0&facets=%5B%22field_frenchtech_hub_pepite%22%2C%22field_categorie%22%2C%22field_frenchtech_hub_pepite%22%5D&tagFilters="}]}`)
  2. req, err := http.NewRequest("POST", "http://6y0slgl8yj-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%20(lite)%203.20.4%3Binstantsearch.js%201.10.4%3BJS%20Helper%202.18.0&x-algolia-application-id=6Y0SLGL8YJ&x-algolia-api-key=6832a361e1e1628f8ddb2483623104c6", bytes.NewBuffer(jsonStr))
  3. req.Header.Set("Content-Type", "application/json")
  5. client := &http.Client{}
  6. resp, err := client.Do(req)
  7. if err != nil {
  8.     panic(err)
  9. }
  10. defer resp.Body.Close()

请问我做错了什么？

英文:

I have a JSON object of the format

  1. {
  2.   "results": [
  3.     {
  4.       "hits": [
  5.         {
  6.           "title": "Juliette DELAUNAY",
  7.           "author:url": "abc.com"
  8.         }
  9.         ]
  10.     }
  11.     ]
  12. }

To decode in my go program, I have made the following structs

  1. type results struct{
  2.     Result []result `json:"results"`
  3. }
  5. type result struct{
  6.     Hits []hit `json:"hits"`
  7. }
  9. type hit struct{
  10.     Name string `json:"title"`
  11.     Url string `json:"author:url"`
  12. }
  13. var m =make(map[string]string)
  14. var t results

But when I try to do the following,

  1. decoder := json.NewDecoder(resp.Body)
  4.     err = decoder.Decode(&t)
  5.     if err != nil {
  6.         fmt.Println(err)
  7.     }
  10.     for _,x := range t.Result[0].Hits{
  11.         m[x.Name] = x.Url
  12.         fmt.Println(x.Name,x.Url)
  13.     }

It gives a runtime error saying index is out of range. What am I doing wrong? Are my structs incorrect for the given json?

EDIT : The JSON file I need to decode

  1. var jsonStr = []byte(`{"requests":[{"indexName":"recherchepepitesAtoZ","params":"query=x&hitsPerPage=2817&maxValuesPerFacet=42&page=0&facets=%5B%22field_frenchtech_hub_pepite%22%2C%22field_categorie%22%2C%22field_frenchtech_hub_pepite%22%5D&tagFilters="}]}`)
  2.     req, err := http.NewRequest("POST", "http://6y0slgl8yj-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%20(lite)%203.20.4%3Binstantsearch.js%201.10.4%3BJS%20Helper%202.18.0&x-algolia-application-id=6Y0SLGL8YJ&x-algolia-api-key=6832a361e1e1628f8ddb2483623104c6", bytes.NewBuffer(jsonStr))
  3.     //req.Header.Set("X-Custom-Header", "application/x-www-form-urlencoded")
  4.     req.Header.Set("Content-Type", "application/json")
  6.     client := &http.Client{}
  7.     resp, err := client.Do(req)
  8.     if err != nil {
  9.         panic(err)
  10.     }
  11.     defer resp.Body.Close()

答案1

得分: 0

这是一个在我的机器和Go Playground上运行的稍作修改的版本：

Go Playground

  1. package main
  3. import (
  4.   "encoding/json"
  5.   "fmt"
  6.   "strings"
  7. )
  9. type results struct {
  10.   Result []result `json:"results"`
  11. }
  13. type result struct {
  14.   Hits []hit `json:"hits"`
  15. }
  17. type hit struct {
  18.   Name string `json:"title"`
  19.   Url  string `json:"author:url"`
  20. }
  22. var m = make(map[string]string)
  24. func main() {
  25.   jsonSample := `{
  26.   "results": [
  27.     {
  28.       "hits": [
  29.         {
  30.           "title": "Juliette DELAUNAY",
  31.           "author:url": "abc.com"
  32.         }
  33.       ]
  34.     }
  35.   ]
  36. }`
  38.   var t results
  39.   decoder := json.NewDecoder(strings.NewReader(jsonSample))
  41.   err := decoder.Decode(&t)
  42.   if err != nil {
  43.     fmt.Println(err)
  44.   }
  46.   for _, x := range t.Result[0].Hits {
  47.     m[x.Name] = x.Url
  48.     fmt.Println(x.Name, x.Url)
  49.   }
  50. }

请注意，这是一个用于解析JSON数据的Go语言示例代码。它定义了一些结构体类型，并使用encoding/json包来解码JSON数据。在main函数中，它将JSON样本解码为results类型的变量t，然后遍历结果并将名称和URL存储在m映射中。最后，它打印出每个名称和URL。

英文:

Here is a slightly modified version that works on my machine and go playground:

GoPlayground

  1. package main
  3. import (
  4.   "encoding/json"
  5.   "fmt"
  6.   "strings"
  7. )
  9. type results struct {
  10.   Result []result `json:"results"`
  11. }
  13. type result struct {
  14.   Hits []hit `json:"hits"`
  15. }
  17. type hit struct {
  18.   Name string `json:"title"`
  19.   Url  string `json:"author:url"`
  20. }
  22. var m = make(map[string]string)
  24. func main() {
  25.   jsonSample := `{
  26.   "results": [
  27.     {
  28.       "hits": [
  29.         {
  30.           "title": "Juliette DELAUNAY",
  31.           "author:url": "abc.com"
  32.         }
  33.         ]
  34.     }
  35.     ]
  36.   }`
  38.   var t results
  39.   decoder := json.NewDecoder(strings.NewReader(jsonSample))
  41.   err := decoder.Decode(&t)
  42.   if err != nil {
  43.     fmt.Println(err)
  44.   }
  46.   for _, x := range t.Result[0].Hits {
  47.     m[x.Name] = x.Url
  48.     fmt.Println(x.Name, x.Url)
  49.   }
  50. }

huangapple
  • 本文由 发表于 2017年2月5日 03:09:34
  • 转载请务必保留本文链接：https://go.coder-hub.com/42044448.html
  • go
  • json
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