去:marshal []字节到JSON,给出一个奇怪的字符串 [英] Go: marshal []byte to JSON, giving a strange string
问题描述
请看下面的代码。
我有两个疑问:
我怎样才能将[] byte传给JSON?
为什么[]字节变成这个字符串? 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)
}
输出为:
{ ByteSlice: AAAAAQID, 单字节:10 IntSlice:[0,0,0,1,2, 3]}
golang操场: https://play.golang.org/p/wanppBGzNR
根据文档: https://golang.org/pkg/encoding/json/#元帅
数组和切片值编码为JSON数组,除了[]字节编码为base64编码的字符串,并且
值 AAAAAQID
是一个零片段,它编码为空的JSON对象。一个base64表示你的字节片 - 例如
b,err:= base64.StdEncoding.DecodeString(AAAAAQID)
if err!= nil {
log.Fatal(err)
}
fmt.Printf(%v,b)
//输出: [0 0 0 1 2 3]
When I try to marshal []byte to JSON format, I only got a strange string.
Please look the following code.
I have two doubt:
How can I marshal []byte to JSON?
Why []byte become this string?
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:
{"ByteSlice":"AAAAAQID","SingleByte":10,"IntSlice":[0,0,0,1,2,3]}
golang playground: https://play.golang.org/p/wanppBGzNR
As per the docs: 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.
The value AAAAAQID
is a base64 representation of your byte slice - e.g.
b, err := base64.StdEncoding.DecodeString("AAAAAQID")
if err != nil {
log.Fatal(err)
}
fmt.Printf("%v", b)
// Outputs: [0 0 0 1 2 3]
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