duanqiang5722
2018-01-29 17:28
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在Golang中解析JSON,答案为无键数组[关闭]

How to handle json if the response comes with an array of data (in JS it was decided by fetching the necessary data on the index), I saw that I wrote that through Unmarshal into the structure, but I can not save the array in the structure so that I can then take the indices from the keys because there are no keys on which you can create a structure.

package main

import (
    "fmt"
    "net/http"
)

func main() {
    url := "My request"
    request := "https://en.wikipedia.org/w/api.php?action=opensearch&search=" + url + "&limit=5&origin=*&format=json"
    response, err := http.Get(request)
    if err != nil {
        fmt.Printf("%s", err)
    }

}

Here's what comes in answer

["bee",["Bee","Beer","Bee Gees","Beef","Beetle"],["Bees are flying insects closely related to wasps and ants, known for their role in pollination and, in the case of the best-known bee species, the European honey bee, for producing honey and beeswax.","Beer is one of the oldest and most widely consumed alcoholic drinks in the world, and the third most popular drink overall after water and tea.","The Bee Gees were a pop music group formed in 1958. Their lineup consisted of brothers Barry, Robin, and Maurice Gibb.","Beef is the culinary name for meat from cattle, particularly skeletal muscle. Humans have been eating beef since prehistoric times.","Beetles are a group of insects that form the order Coleoptera, in the superorder Endopterygota. Their front pair of wings is hardened into wing-cases, elytra, distinguishing them from most other insects."],["https://en.wikipedia.org/wiki/Bee","https://en.wikipedia.org/wiki/Beer","https://en.wikipedia.org/wiki/Bee_Gees","https://en.wikipedia.org/wiki/Beef","https://en.wikipedia.org/wiki/Beetle"]]
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2条回答 默认 最新

  • doulandai0641 2018-01-30 01:37
    已采纳

    You could define a custom type which implements json.Unmarshaler by mapping the parsed array values into a struct such as below:

    type SearchResults struct {
      Query   string
      Results []Result
    }
    
    type Result struct {
      Name, Description, URL string
    }
    
    func (sr *SearchResults) UnmarshalJSON(bs []byte) error {
      array := []interface{}{}
      err := json.Unmarshal(bs, &array)
      if err != nil {
        return err
      }
      sr.Query = array[0].(string)
      for i := range array[1].([]interface{}) {
        sr.Results = append(sr.Results, Result{
          array[1].([]interface{})[i].(string),
          array[2].([]interface{})[i].(string),
          array[3].([]interface{})[i].(string),
        })
      }
      return nil
    }
    
    func main() {
      sr := &SearchResults{}
      err := json.Unmarshal([]byte(jsonstr), sr)
      if err != nil {
        panic(err)
      }
      fmt.Printf("OK: query=%q
    ", sr.Query)
      for i, result := range sr.Results {
        fmt.Printf("OK: result[%d]=%#v
    ", i, result)
      }
    }
    
    // OK: query="bee"
    // OK: result[0]=main.Result{Name:"Bee", Description:"Bees are flying insects closely related to wasps and ants, known for their role in pollination and, in the case of the best-known bee species, the European honey bee, for producing honey and beeswax.", URL:"https://en.wikipedia.org/wiki/Bee"}
    // OK: result[1]=main.Result{Name:"Beer", Description:"Beer is one of the oldest and most widely consumed alcoholic drinks in the world, and the third most popular drink overall after water and tea.", URL:"https://en.wikipedia.org/wiki/Beer"}
    // OK: result[2]=main.Result{Name:"Bee Gees", Description:"The Bee Gees were a pop music group formed in 1958. Their lineup consisted of brothers Barry, Robin, and Maurice Gibb.", URL:"https://en.wikipedia.org/wiki/Bee_Gees"}
    // OK: result[3]=main.Result{Name:"Beef", Description:"Beef is the culinary name for meat from cattle, particularly skeletal muscle. Humans have been eating beef since prehistoric times.", URL:"https://en.wikipedia.org/wiki/Beef"}
    // OK: result[4]=main.Result{Name:"Beetle", Description:"Beetles are a group of insects that form the order Coleoptera, in the superorder Endopterygota. Their front pair of wings is hardened into wing-cases, elytra, distinguishing them from most other insects.", URL:"https://en.wikipedia.org/wiki/Beetle"}
    
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  • duanliao6077 2018-01-29 18:44

    Thanks @Peter for answer and code example: https://play.golang.org/p/t-iuGVaRsNM

    package main
    
    import (
        "encoding/json"
        "fmt"
        "io/ioutil"
        "log"
        "net/http"
    )
    
    func main() {
    
        //Ask user to enter search parameter
        fmt.Printf("Search something: ")
        var s string
        fmt.Scanf("%s", &s)
    
        //Create search url
        url := s
        request := "https://en.wikipedia.org/w/api.php?action=opensearch&search=" + url + "&limit=5&origin=*&format=json"
    
        //Sending request
        response, err := http.Get(request)
        if err != nil {
            log.Fatal(err)
        }
        defer response.Body.Close()
    
        //Unmarshal and store to responsedata interface    
        var responsedata []interface{}
        if err := json.NewDecoder(response.Body).Decode(&responsedata); err != nil {
            log.Fatal(err)
        }
    
        //Loop through the responsedata and output
        for _, x := range responsedata {
            switch value := x.(type) {
            case string:
                fmt.Println(value)
            case []interface{}:
                for _, v := range value {
                    fmt.Println(v.(string))
                }
            }
        }
    }
    
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