json.Marshal 返回奇怪的结果

Question

我正在尝试将 go 结构转换为 JSON。我以为我知道该怎么做，但我对这个程序的输出感到困惑。我错过了什么？

package main
import "fmt"
import "encoding/json"

type Zoo struct {                                                                       
    name string
    animals []Animal
}
type Animal struct {
    species string
    says string
}

func main() {
    zoo := Zoo{"Magical Mystery Zoo",                                                   
         []Animal {
            { "Cow", "Moo"},
            { "Cat", "Meow"},
            { "Fox", "???"},
        },
    }
    zooJson, err := json.Marshal(zoo)
    if (err != nil) {
        fmt.Println(err)
    }

    fmt.Println(zoo)
    fmt.Println(zooJson)
}

输出:

{Magical Mystery Zoo [{Cow Moo} {Cat Meow} {Fox ???}]}
[123 125]

预期输出(类似以下内容):

{Magical Mystery Zoo [{Cow Moo} {Cat Meow} {Fox ???}]}
{
    "name" : "Magical Mystery Zoo",
    "animals" : [{
             "name" : "Cow",
             "says" : "moo"
         }, {
             "name" : "Cat",
             "says" : "Meow"
         }, {
             "name" : "Fox",
             "says" : "???"
         }
    ]
 }

[123 125] 来自哪里？

感谢您的帮助!

Answer 1

编码的结果是 []byte 所以 123 和 125 是 { 和 的 ascii >

必须导出结构字段才能使编码工作:

Each exported struct field becomes a member of the object