golang中使用proto3协议导致的空值字段不显示的问题处理方案

type MemberResponse struct {
  Id int32 `json "id"`
  Phone string `json "phone"`
  Age int8 `json "age"`
}

//获取用户信息的接口
func (m *Member) GetMember(req *proto.MemberRequest, resp * proto.MemberResponse) error {
  resp.Phone = "15112810201"
  resp.Id = 12
  return nil
}

{
  "phone" : "15112810201",
  "id"  : 12
}

// Marshaler is a configurable object for converting between
// protocol buffer objects and a JSON representation for them.
type Marshaler struct {
  // 是否将枚举值设定为整数，而不是字符串类型.
  EnumsAsInts bool
  // 是否将字段值为空的渲染到JSON结构中
  EmitDefaults bool
  //缩进每个级别的字符串
  Indent string
  //是否使用原生的proto协议中的字段
  OrigName bool
}

import (
  member "proto/member"
)
var jsonpbMarshaler *jsonpb.Marshaler

func queryHandler(req *http.Requst, resp http.ResponseWriter){
  var (
    _buffer bytes.Buffer
  )
  memberResponse, err := member.GetMember(context.TODO(), &member.MemberRequest{})
  //调用此方法实现转换
  jsonpbMarshaler.Marshal(&_buffer, memberResponse)
  jsonCnt := _buffer.Bytes()
  resp.Header().Set('Content-Type', 'application/json')
  resp.Write(jsonCnt)
  return
}

func main(){
  jsonpbMarshaler = &jsonpb.Marshaler{
    EnumsAsInts : true,
    EmitDefaults: true,
    OrigName  : true
  }
  //其他http处理代码块
}