c.JSON gin.H{()} 输出空对象

我刚刚开始学习 GO(lang) 结合 Gin 框架，我决定编写一些简单的 api 来获取有关酒精饮料的数据。

我当前的问题是 api (get 方法http://localhost:8080/alcohol-drinks) 返回空数据对象

My code:

package main

import (
    "github.com/gin-gonic/gin"
)

type alcoholDrink struct {
    name             string
    description      string
    nutritionsAmount string
    nutritions       map[string]string
}

func main() {
    r := gin.Default()
    r.GET("/alcohol-drinks", func(c *gin.Context) {

        d := []alcoholDrink{
            {
                name:             "Gin",
                description:      "DescriptionGin is a distilled alcoholic drink that derives its predominant flavour from juniper berries. Gin is one of the broadest categories of spirits, all of various origins, styles, and flavour profiles, that revolve around juniper as a common ingredient",
                nutritionsAmount: "per 100 grams",
                nutritions: map[string]string{
                    "Calories":     "263",
                    "TotalFat":     "0 g",
                    "Cholesterol":  "0 mg",
                    "Sodium":       "2 mg",
                    "Carbohydrate": "0 g",
                    "Protein":      "0 g",
                },
            },
            {
                name:             "Vodka",
                description:      "odka is a clear distilled alcoholic beverage with different varieties originating in Poland and Russia. It is composed primarily of water and ethanol, but sometimes with traces of impurities and flavorings.",
                nutritionsAmount: "per 100 grams",
                nutritions: map[string]string{
                    "Calories":     "231",
                    "TotalFat":     "0 g",
                    "Cholesterol":  "0 mg",
                    "Sodium":       "1 mg",
                    "Carbohydrate": "0 g",
                    "Protein":      "0 g",
                },
            },
        }

        c.JSON(200, gin.H{
            "status": "OK",
            "code":   200,
            "data":   d,
        })

    })
    r.Run()
}

问题是，我需要对变量做什么d那么数据会在浏览器中输出吗？

小写字段被认为是私有的，并且不会被标准 json 序列化器序列化。

更改您的字段alcoholDrink输入，以便它们以大写字母开头：

type alcoholDrink struct {
    Name             string
    Description      string
    NutritionsAmount string
    Nutritions       map[string]string
}

如果您想在生成的 json 中看到小写名称，可以向每个字段添加注释：

type alcoholDrink struct {
    Name             string    `json:"name"`
    Description      string    `json:"description"`
    NutritionsAmount string    `json:"nutritionsAmount"`
    Nutritions       map[string]string   `json:"nutritions"`
}