golang的中json,marshal byte数组会默认对byte数组进行base64编码,编码成string,重写MarshalJSON方法保留原始数据
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package main
import (
"encoding/base64"
"encoding/json"
"fmt"
"log"
"strings"
)
type JSONableSlice []byte
func (u JSONableSlice) MarshalJSON() ([]byte, error) {
var result string
if u == nil {
result = "null"
} else {
result = strings.Join(strings.Fields(fmt.Sprintf("%d", u)), ",")
}
return []byte(result), nil
}
type Param1 struct {
Content []byte `json:"content"`
Public string `json:"public"`
Sig string `json:"sig"`
}
type Param2 struct {
Content JSONableSlice `json:"content"`
Public string `json:"public"`
Sig string `json:"sig"`
}
func init() {
// init log
log.SetFlags(log.Lshortfile)
}
func main() {
content := []byte("firefly")
public := "pp"
sig := "ss"
log.Printf("content: %v", content)
log.Printf("public: %v", public)
log.Printf("sig: %v", sig)
log.Println(strings.Repeat("-", 50))
p1 := Param1{
Content: content,
Public: public,
Sig: sig,
}
rr1, err := json.Marshal(p1)
if err != nil {
log.Fatal(err)
}
log.Println("json中的byte数组 默认json编码")
log.Printf("rr1: %s", string(rr1)) //content 因为是byte数组,默认用base64编码成string
contentBase64 := base64.StdEncoding.EncodeToString(content)
log.Printf("contentBase64: %s", contentBase64)
log.Println("json中的byte数组 默认json解码")
var r1Decode Param1
err = json.Unmarshal(rr1, &r1Decode)
if err != nil {
log.Fatal(err)
}
log.Printf("r1Decode: %+v", r1Decode)
log.Printf(string(r1Decode.Content))
log.Println(strings.Repeat("-", 50))
log.Println("json中的byte数组 自定义byte数组编码的json编码,保留byte数组原始数据")
p2 := Param2{
Content: content,
Public: public,
Sig: sig,
}
rr2, err := json.Marshal(p2)
if err != nil {
log.Fatal(err)
}
log.Printf("rr2: %s", string(rr2))
log.Printf("json中的byte数组 自定义byte数组编码解码的json解码,使用byte数组原始数据赋值到结构体")
var r2Decode Param2
err = json.Unmarshal(rr2, &r2Decode)
if err != nil {
log.Fatal(err)
}
log.Printf("r2Decode: %+v", r2Decode)
log.Printf(string(r2Decode.Content))
}
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输出
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main.go:44: content: [102 105 114 101 102 108 121]
main.go:45: public: pp
main.go:46: sig: ss
main.go:48: --------------------------------------------------
main.go:59: json中的byte数组 默认json编码
main.go:60: rr1: {"content":"ZmlyZWZseQ==","public":"pp","sig":"ss"}
main.go:62: contentBase64: ZmlyZWZseQ==
main.go:64: json中的byte数组 默认json解码
main.go:70: r1Decode: {Content:[102 105 114 101 102 108 121] Public:pp Sig:ss}
main.go:71: firefly
main.go:73: --------------------------------------------------
main.go:75: json中的byte数组 自定义byte数组编码的json编码,保留byte数组原始数据
main.go:85: rr2: {"content":[102,105,114,101,102,108,121],"public":"pp","sig":"ss"}
main.go:87: json中的byte数组 自定义byte数组编码解码的json解码,使用byte数组原始数据赋值到结构体
main.go:93: r2Decode: {Content:[102 105 114 101 102 108 121] Public:pp Sig:ss}
main.go:94: firefly
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参考:https://stackoverflow.com/questions/14177862/how-to-marshal-a-byte-uint8-array-as-json-array-in-go/14178407#14178407