“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.”

所以我认为您可能需要通过实现自己的MarshalJSON方法来使您的结构实现Marshaler接口,该方法在您的[] uint8中生成更理想的JSON数组编码.

举个例子：

import "fmt"
import "encoding/json"
import "strings"
 
type Test struct {
    Name  string
    Array []uint8
}
 
func (t *Test) MarshalJSON() ([]byte,error) {
    var array string
    if t.Array == nil {
        array = "null"
    } else {
        array = strings.Join(strings.Fields(fmt.Sprintf("%d",t.Array)),",")
    }
    jsonResult := fmt.Sprintf(`{"Name":%q,"Array":%s}`,t.Name,array)
    return []byte(jsonResult),nil
}
 
func main() {
    t := &Test{"Go",[]uint8{'h','e','l','o'}}
 
    m,err := json.Marshal(t)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Printf("%s",m) // {"Name":"Go","Array":[104,101,108,111]}
}

http://play.golang.org/p/Tip59Z9gqs

或者更好的想法是创建一个以[] uint8作为其基础类型的新类型,使该类型成为Marshaler,并在结构中使用该类型.

import "fmt"
import "encoding/json"
import "strings"
 
type JSONableSlice []uint8
 
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 Test struct {
    Name  string
    Array JSONableSlice
}
 
func main() {
    t := &Test{"Go",111]}
}

http://play.golang.org/p/6aURXw8P5d