json - 如何解析golang中的json数组？

Question

package main

import (
    "encoding/json"
    "fmt"
)

type PublicKey struct {
    name string
    price string
}

type KeysResponse struct {
    Collection []PublicKey
}

func main() {
    s := `[{"name":"Galaxy Nexus", "price":"3460.00"},{"name":"Galaxy Nexus", "price":"3460.00"}]`

    keys := make([]PublicKey,0)
    err := json.Unmarshal([]byte(s), &keys)
    if err == nil {
        fmt.Printf("%+v\n", keys)
    } else {
        fmt.Println(err)
        fmt.Printf("%+v\n", keys)
    }
}

输出:[{name: price:}]

我有 api 调用返回的结果，它就像对象数组(json 数组)复杂格式。我需要通过 golang 解析该结果，我该如何实现？以下数据是我从 api 调用中获得的结果。

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2013","favourites_count":5,"utc_offset":19800,"time_zone":"Chennai","geo_enabled":true,"verified":false,"statuses_count":124,"lang":"en","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"131516","profile_background_image_url":"http:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_image_url_https":"https:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_tile":true,"profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/1690262984\/1429709252","profile_link_color":"009999","profile_sidebar_border_color":"EEEEEE","profile_sidebar_fill_color":"EFEFEF","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":false,"default_profile_image":false,"following":true,"follow_request_sent":false,"notifications":false},"sender_id":1690262984,"sender_id_str":"1690262984","sender_screen_name":"Ashok_kumar_T","recipient":{"id":4848598394,"id_str":"4848598394","name":"Prabhu","screen_name":"prabhu_cfml","location":"","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":1,"friends_count":1,"listed_count":0,"created_at":"Tue Feb 02 09:25:17 +0000 2016","favourites_count":0,"utc_offset":null,"time_zone":null,"geo_enabled":false,"verified":false,"statuses_count":0,"lang":"en-gb","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"F5F8FA","profile_background_image_url":null,"profile_background_image_url_https":null,"profile_background_tile":false,"profile_image_url":"http:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_image_url_https":"https:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_link_color":"2B7BB9","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":true,"default_profile_image":true,"following":false,"follow_request_sent":false,"notifications":false},"recipient_id":4848598394,"recipient_id_str":"4848598394","recipient_screen_name":"prabhu_cfml","created_at":"Tue Feb 02 11:04:21 +0000 2016","entities":{"hashtags":[],"symbols":[],"user_mentions":[],"urls":[]}},{"id":694476425793916931,"id_str":"694476425793916931","text":"Hi","sender":{"id":1690262984,"id_str":"1690262984","name":"Ashok Kumar T","screen_name":"Ashok_kumar_T","location":"Trivandrum","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":68,"friends_count":32,"listed_count":0,"created_at":"Thu Aug 22 06:52:53 +0000 2013","favourites_count":5,"utc_offset":19800,"time_zone":"Chennai","geo_enabled":true,"verified":false,"statuses_count":124,"lang":"en","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"131516","profile_background_image_url":"http:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_image_url_https":"https:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_tile":true,"profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/1690262984\/1429709252","profile_link_color":"009999","profile_sidebar_border_color":"EEEEEE","profile_sidebar_fill_color":"EFEFEF","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":false,"default_profile_image":false,"following":true,"follow_request_sent":false,"notifications":false},"sender_id":1690262984,"sender_id_str":"1690262984","sender_screen_name":"Ashok_kumar_T","recipient":{"id":4848598394,"id_str":"4848598394","name":"Prabhu","screen_name":"prabhu_cfml","location":"","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":1,"friends_count":1,"listed_count":0,"created_at":"Tue Feb 02 09:25:17 +0000 2016","favourites_count":0,"utc_offset":null,"time_zone":null,"geo_enabled":false,"verified":false,"statuses_count":0,"lang":"en-gb","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"F5F8FA","profile_background_image_url":null,"profile_background_image_url_https":null,"profile_background_tile":false,"profile_image_url":"http:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_image_url_https":"https:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_link_color":"2B7BB9","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":true,"default_profile_image":true,"following":false,"follow_request_sent":false,"notifications":false},"recipient_id":4848598394,"recipient_id_str":"4848598394","recipient_screen_name":"prabhu_cfml","created_at":"Tue Feb 02 11:04:17 +0000 2016","entities":{"hashtags":[],"symbols":[],"user_mentions":[],"urls":[]}}]

Answer 1

您只漏掉了一点:您需要导出结构的字段:

type PublicKey struct {
    Name  string
    Price string
}

它会起作用(在 Go Playground 上尝试):

[{Name:Galaxy Nexus Price:3460.00} {Name:Galaxy Nexus Price:3460.00}]

请注意，JSON 文本包含带有小写文本的字段名称，但 json 包“聪明”到足以匹配它们。如果它们完全不同，您可以使用结构标签告诉 json 包如何在 JSON 文本中找到它们(或者它们应该如何编码)，例如:

type PublicKey struct {
    Name  string `json:"some_name"`
    Price string `json:"JsonPrice"`
}

要解析其他 JSON 文本，请创建一个对 JSON 数据建模的 Go 结构。我建议格式化 JSON 以查看真实结构，例如你可以用这个online JSON formatter/validator .然后您可以解码为该结构的一部分。

或者简单地解码成一片 map ，例如[]map[string]interface{}，但随后您需要对 map 进行索引以获取不同的值，并且您还需要使用类型断言来获取“类型化”值。