将 JSON 数组解组为 Go 结构体（数组位于 JSON 字符串的中间）

huangapple
go评论141阅读模式
英文:

unmarshal json array into go struct (array is in the middle of the JSON string

问题

我是你的中文翻译助手，以下是你提供的代码的翻译：

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. 	"io/ioutil"
  7. 	"log"
  8. 	"net/http"
  9. )
  11. // WeatherData 结构体用于存储从 API 调用中获取的数据
  12. type WeatherData struct {
  13. 	Wind Wind
  14. 	Sys  Sys
  15. 	// Weather Weather
  16. 	Name string `json:"name"`
  17. }
  19. ////////////// 在解组这个结构体时出现错误 ///////////
  20. // Weather 提供基本的天气信息
  21. // type Weather struct {
  22. // 	ID      int    `json:"id"`
  23. // 	Descrip string `json:"description"`
  24. // 	Icon    string `json:"icon"`
  25. // }
  26. /////////////////////////////////////////////////////////
  28. // Sys 包括日出、日落、国家等信息
  29. type Sys struct {
  30. 	Country string `json:"country"`
  31. }
  33. // Wind 结构体用于获取具体的风力特征
  34. type Wind struct {
  35. 	Speed  float64 `json:"speed"`
  36. 	Degree float64 `json:"deg"`
  37. 	Gust   float64 `json:"gust"`
  38. }
  40. func main() {
  41. 	res, getErr := http.Get("http://api.openweathermap.org/data/2.5/weather?zip=REMOVED,us&appid=REMOVEDBUTWILLPOSTJSONData")
  42. 	if getErr != nil {
  43. 		log.Fatalln("http.Get error:", getErr)
  44. 	}
  45. 	defer res.Body.Close()
  46. 	body, readErr := ioutil.ReadAll(res.Body)
  47. 	if readErr != nil {
  48. 		log.Fatalln("Read Error:", readErr)
  49. 	}
  50. 	//////////// 无法解组通过这里的数组 //////////
  51. 	var data WeatherData
  52. 	if err := json.Unmarshal(body, &data); err != nil {
  53. 		panic(err)
  54. 	}
  56. 	fmt.Println("Wind gusts:", data.Wind.Gust)
  57. 	fmt.Println("Wind speed:", data.Wind.Speed)
  58. 	fmt.Println("Wind degrees:", data.Wind.Degree)
  60. 	fmt.Println("Country is:", data.Sys.Country)
  61. 	fmt.Println("City is:", data.Name)
  63. 	///////////// 无法访问 Description...或者 Weather 中的任何内容
  64. 	// fmt.Println("Country is:", data.Weather.Descrip) // 由于该部分位于数组中，无法访问
  66. }

这是你提供的可用的 JSON 数据：

  1. {
  2.   "coord": {
  3.     "lon": -97.31,
  4.     "lat": 32.94
  5.   },
  6.   "weather": [  // 无法正确访问这里
  7.     {
  8.       "id": 800,
  9.       "main": "Clear",
  10.       "description": "clear sky",
  11.       "icon": "01d"
  12.     }
  13.   ],
  14.   "base": "stations",
  15.   "main": {
  16.     "temp": 306.46,
  17.     "pressure": 1014,
  18.     "humidity": 55,
  19.     "temp_min": 306.15,
  20.     "temp_max": 307.15
  21.   },
  22.   "visibility": 16093,
  23.   "wind": {
  24.     "speed": 5.1,
  25.     "deg": 150,
  26.     "gust": 7.2
  27.   },
  28.   "clouds": {
  29.     "all": 1
  30.   },
  31.   "dt": 1499120100,
  32.   "sys": {
  33.     "type": 1,
  34.     "id": 2597,
  35.     "message": 0.0225,
  36.     "country": "US",
  37.     "sunrise": 1499081152,
  38.     "sunset": 1499132486
  39.   },
  40.   "id": 0,
  41.   "name": "Fort Worth",
  42.   "cod": 200
  43. }

希望对你有帮助！

英文:

I am new to Go. I am working with a weather API. I have commented out the sections that cause the error. I have seen several other links that have a similar problem, however none of them seem to have the array in the middle of the JSON string. I'm sure there is a way to define the struct with a slice. I can't seem to get get the syntax to allow it. Here is where I'm stuck:

  1. package main
  2. import (
  3. "encoding/json"
  4. "fmt"
  5. "io/ioutil"
  6. "log"
  7. "net/http"
  8. )
  9. // WeatherData struct to collect data from the API call
  10. type WeatherData struct {
  11. Wind Wind
  12. Sys  Sys
  13. // Weather Weather
  14. Name string `json:"name"`
  15. }
  16. ////////////// ERROR when unmarshalling this struct /////////
  17. // Weather provides basic weather info
  18. // type Weather struct {
  19. // 	ID      int    `json:"id"`
  20. // 	Descrip string `json:"description"`
  21. // 	Icon    string `json:"icon"`
  22. // }
  23. /////////////////////////////////////////////////////////////
  24. // Sys includes sunrise, sunset, country, etc.
  25. type Sys struct {
  26. Country string `json:"country"`
  27. }
  28. // Wind struct to get specific wind characteristics
  29. type Wind struct {
  30. Speed  float64 `json:"speed"`
  31. Degree float64 `json:"deg"`
  32. Gust   float64 `json:"gust"`
  33. }
  34. func main() {
  35. res, getErr := http.Get("http://api.openweathermap.org/data/2.5/weather?zip=REMOVED,us&appid=REMOVEDBUTWILLPOSTJSONData")
  36. if getErr != nil {
  37. log.Fatalln("http.Get error: ", getErr)
  38. }
  39. defer res.Body.Close()
  40. body, readErr := ioutil.ReadAll(res.Body)
  41. if readErr != nil {
  42. log.Fatalln("Read Error: ", readErr)
  43. }
  44. //////////// UNABLE TO UNMARSHAL the array that passes through here ////
  45. var data WeatherData
  46. if err := json.Unmarshal(body, &data); err != nil {
  47. panic(err)
  48. }
  49. fmt.Println("Wind gusts: ", data.Wind.Gust)
  50. fmt.Println("Wind speed: ", data.Wind.Speed)
  51. fmt.Println("Wind degrees: ", data.Wind.Degree)
  52. fmt.Println("Country is: ", data.Sys.Country)
  53. fmt.Println("City is: ", data.Name)
  54. ///////////////// CAN'T ACCESS Description...or anything in Weather
  55. // fmt.Println("Country is: ", data.Weather.Descrip) // cannot access due to this portion being inside an array
  56. }
  57. /////////////////THIS IS THE JSON DATA THAT IS AVAILABLE ///////////
  58. {
  59. "coord": {
  60. "lon": -97.31,
  61. "lat": 32.94
  62. },
  63. "weather": [  // CAN'T ACCESS THIS CORRECTLY
  64. {
  65. "id": 800,
  66. "main": "Clear",
  67. "description": "clear sky",
  68. "icon": "01d"
  69. }
  70. ],
  71. "base": "stations",
  72. "main": {
  73. "temp": 306.46,
  74. "pressure": 1014,
  75. "humidity": 55,
  76. "temp_min": 306.15,
  77. "temp_max": 307.15
  78. },
  79. "visibility": 16093,
  80. "wind": {
  81. "speed": 5.1,
  82. "deg": 150,
  83. "gust": 7.2
  84. },
  85. "clouds": {
  86. "all": 1
  87. },
  88. "dt": 1499120100,
  89. "sys": {
  90. "type": 1,
  91. "id": 2597,
  92. "message": 0.0225,
  93. "country": "US",
  94. "sunrise": 1499081152,
  95. "sunset": 1499132486
  96. },
  97. "id": 0,
  98. "name": "Fort Worth",
  99. "cod": 200
  100. }

答案1

得分: 5

你必须在WeatherData中定义Weather结构体的切片。

取消注释Weather结构体，并将WeatherData结构体更新为以下内容。

  1. // WeatherData struct to collect data from the API call
  2. type WeatherData struct {
  3.     Wind    Wind      `json:"wind"`
  4.     Sys     Sys       `json:"sys"`
  5.     Weather []Weather `json:"weather"`
  6.     Name    string    `json:"name"`
  7. }

请查看示例代码：https://play.golang.org/p/4KFqRuxcx2

英文:

You have to define slice of Weather struct in WeatherData.

Uncomment Weather struct and update WeatherData struct to following.

  1. // WeatherData struct to collect data from the API call
  2. type WeatherData struct {
  3. Wind    Wind      `json:"wind"`
  4. Sys     Sys       `json:"sys"`
  5. Weather []Weather `json:"weather"`
  6. Name    string    `json:"name"`
  7. }

Please have a look on example code: https://play.golang.org/p/4KFqRuxcx2

huangapple
  • 本文由 发表于 2017年7月4日 08:58:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/44895535.html
  • arrays
  • go
  • json
  • struct
  • unmarshalling
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