Go: marshal []byte to JSON, 给出一个奇怪的字符串
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Go: marshal []byte to JSON, giving a strange string
提问by someblue
When I try to marshal []byte to JSON format, I only got a strange string.
当我尝试将 []byte 编组为 JSON 格式时，我只得到一个奇怪的字符串。
Please look the following code.
请看下面的代码。
I have two doubt:
我有两个疑问：
How can I marshal []byte to JSON?
如何将 []byte 编组为 JSON？
Why []byte become this string?
为什么 []byte 成为这个字符串？
package main
import (
"encoding/json"
"fmt"
"os"
)
func main() {
type ColorGroup struct {
ByteSlice []byte
SingleByte byte
IntSlice []int
}
group := ColorGroup{
ByteSlice: []byte{0,0,0,1,2,3},
SingleByte: 10,
IntSlice: []int{0,0,0,1,2,3},
}
b, err := json.Marshal(group)
if err != nil {
fmt.Println("error:", err)
}
os.Stdout.Write(b)
}
the output is:
输出是：
{"ByteSlice":"AAAAAQID","SingleByte":10,"IntSlice":[0,0,0,1,2,3]}
golang playground: https://play.golang.org/p/wanppBGzNR
golang 游乐场：https: //play.golang.org/p/wanppBGzNR
回答by elithrar
As per the docs: https://golang.org/pkg/encoding/json/#Marshal
根据文档：https: //golang.org/pkg/encoding/json/#Marshal
Array and slice values encode as JSON arrays, except that []byte encodes as a base64-encoded string, and a nil slice encodes as the null JSON object.
数组和切片值编码为 JSON 数组，除了 []byte 编码为 base64 编码的字符串，而 nil 切片编码为 null JSON 对象。
The value AAAAAQIDis a base64 representation of your byte slice - e.g.
该值AAAAAQID是您的字节切片的 base64 表示 - 例如
b, err := base64.StdEncoding.DecodeString("AAAAAQID")
if err != nil {
log.Fatal(err)
}
fmt.Printf("%v", b)
// Outputs: [0 0 0 1 2 3]
