go -生成pb文件

在使用 protoc 工具生成 go 代码的时候报出的如下错误：
在syntax = “proto3”; //版本号版本中字段默认为syntax = “proto3”; //版本号

protoc ./test.proto --go_out=./WARNING: Missing 'go_package' option in "message.proto",
please specify it with the full Go package path as
a future release of protoc-gen-go will require this be specified.

是因为在 proto3 的语法中缺少了 option go_package。
解决：
在syntax下面添加option信息

option go_package = "student;student";
student 表示生成的go文件的存放地址，会自动生成目录的。
stu表示生成的go文件所属的包名

比如：

option go_package = "student;stu";

test.proto


syntax = "proto3"; //版本号
option go_package = "student;stu";
message Student{ //消息，对应于Go的结构体string name=1; //1:标号，唯一 即可（相当于数据库中的Id，不一定要从1 ，2的顺序依次排列。）int32 age=2;  //必须指定整型的范围，如int32，int64string address=3;ClassName cn=4;
}
message Students{repeated Student person=1;  // repeated 修饰，相当于Go中切片string school=2;
}
enum ClassName{   //枚举class1=0;  //标号 必须从 0开始class2=1;class3=2;
}

proto_test为我工程的目录

最后生成的结构如上
test.pb.go

// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
//  protoc-gen-go v1.25.0-devel
//  protoc        (unknown)
// source: test.protopackage stuimport (protoreflect "google.golang.org/protobuf/reflect/protoreflect"protoimpl "google.golang.org/protobuf/runtime/protoimpl"reflect "reflect"sync "sync"
)const (// Verify that this generated code is sufficiently up-to-date._ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)// Verify that runtime/protoimpl is sufficiently up-to-date._ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)type ClassName int32const (ClassName_class1 ClassName = 0 //标号 必须从 0开始ClassName_class2 ClassName = 1ClassName_class3 ClassName = 2
)// Enum value maps for ClassName.
var (ClassName_name = map[int32]string{0: "class1",1: "class2",2: "class3",}ClassName_value = map[string]int32{"class1": 0,"class2": 1,"class3": 2,}
)func (x ClassName) Enum() *ClassName {p := new(ClassName)*p = xreturn p
}func (x ClassName) String() string {return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
}func (ClassName) Descriptor() protoreflect.EnumDescriptor {return file_test_proto_enumTypes[0].Descriptor()
}func (ClassName) Type() protoreflect.EnumType {return &file_test_proto_enumTypes[0]
}func (x ClassName) Number() protoreflect.EnumNumber {return protoreflect.EnumNumber(x)
}// Deprecated: Use ClassName.Descriptor instead.
func (ClassName) EnumDescriptor() ([]byte, []int) {return file_test_proto_rawDescGZIP(), []int{0}
}type Student struct {state         protoimpl.MessageStatesizeCache     protoimpl.SizeCacheunknownFields protoimpl.UnknownFieldsName    string    `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"` //1:标号，唯一 即可（相当于数据库中的Id，不一定要从1 ，2的顺序依次排列。）Age     int32     `protobuf:"varint,2,opt,name=age,proto3" json:"age,omitempty"`  //必须指定整型的范围，如int32，int64Address string    `protobuf:"bytes,3,opt,name=address,proto3" json:"address,omitempty"`Cn      ClassName `protobuf:"varint,4,opt,name=cn,proto3,enum=ClassName" json:"cn,omitempty"`
}func (x *Student) Reset() {*x = Student{}if protoimpl.UnsafeEnabled {mi := &file_test_proto_msgTypes[0]ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))ms.StoreMessageInfo(mi)}
}func (x *Student) String() string {return protoimpl.X.MessageStringOf(x)
}func (*Student) ProtoMessage() {}func (x *Student) ProtoReflect() protoreflect.Message {mi := &file_test_proto_msgTypes[0]if protoimpl.UnsafeEnabled && x != nil {ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))if ms.LoadMessageInfo() == nil {ms.StoreMessageInfo(mi)}return ms}return mi.MessageOf(x)
}// Deprecated: Use Student.ProtoReflect.Descriptor instead.
func (*Student) Descriptor() ([]byte, []int) {return file_test_proto_rawDescGZIP(), []int{0}
}func (x *Student) GetName() string {if x != nil {return x.Name}return ""
}func (x *Student) GetAge() int32 {if x != nil {return x.Age}return 0
}func (x *Student) GetAddress() string {if x != nil {return x.Address}return ""
}func (x *Student) GetCn() ClassName {if x != nil {return x.Cn}return ClassName_class1
}type Students struct {state         protoimpl.MessageStatesizeCache     protoimpl.SizeCacheunknownFields protoimpl.UnknownFieldsPerson []*Student `protobuf:"bytes,1,rep,name=person,proto3" json:"person,omitempty"` // repeated 修饰，相当于Go中切片School string     `protobuf:"bytes,2,opt,name=school,proto3" json:"school,omitempty"`
}func (x *Students) Reset() {*x = Students{}if protoimpl.UnsafeEnabled {mi := &file_test_proto_msgTypes[1]ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))ms.StoreMessageInfo(mi)}
}func (x *Students) String() string {return protoimpl.X.MessageStringOf(x)
}func (*Students) ProtoMessage() {}func (x *Students) ProtoReflect() protoreflect.Message {mi := &file_test_proto_msgTypes[1]if protoimpl.UnsafeEnabled && x != nil {ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))if ms.LoadMessageInfo() == nil {ms.StoreMessageInfo(mi)}return ms}return mi.MessageOf(x)
}// Deprecated: Use Students.ProtoReflect.Descriptor instead.
func (*Students) Descriptor() ([]byte, []int) {return file_test_proto_rawDescGZIP(), []int{1}
}func (x *Students) GetPerson() []*Student {if x != nil {return x.Person}return nil
}func (x *Students) GetSchool() string {if x != nil {return x.School}return ""
}var File_test_proto protoreflect.FileDescriptorvar file_test_proto_rawDesc = []byte{0x0a, 0x0a, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x65, 0x0a, 0x07,0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18,0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x61,0x67, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x61, 0x67, 0x65, 0x12, 0x18, 0x0a,0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07,0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x12, 0x1a, 0x0a, 0x02, 0x63, 0x6e, 0x18, 0x04, 0x20,0x01, 0x28, 0x0e, 0x32, 0x0a, 0x2e, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x4e, 0x61, 0x6d, 0x65, 0x52,0x02, 0x63, 0x6e, 0x22, 0x44, 0x0a, 0x08, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x73, 0x12,0x20, 0x0a, 0x06, 0x70, 0x65, 0x72, 0x73, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32,0x08, 0x2e, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x52, 0x06, 0x70, 0x65, 0x72, 0x73, 0x6f,0x6e, 0x12, 0x16, 0x0a, 0x06, 0x73, 0x63, 0x68, 0x6f, 0x6f, 0x6c, 0x18, 0x02, 0x20, 0x01, 0x28,0x09, 0x52, 0x06, 0x73, 0x63, 0x68, 0x6f, 0x6f, 0x6c, 0x2a, 0x2f, 0x0a, 0x09, 0x43, 0x6c, 0x61,0x73, 0x73, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x0a, 0x0a, 0x06, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x31,0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x32, 0x10, 0x01, 0x12, 0x0a,0x0a, 0x06, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x33, 0x10, 0x02, 0x42, 0x0d, 0x5a, 0x0b, 0x73, 0x74,0x75, 0x64, 0x65, 0x6e, 0x74, 0x3b, 0x73, 0x74, 0x75, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,0x33,
}var (file_test_proto_rawDescOnce sync.Oncefile_test_proto_rawDescData = file_test_proto_rawDesc
)func file_test_proto_rawDescGZIP() []byte {file_test_proto_rawDescOnce.Do(func() {file_test_proto_rawDescData = protoimpl.X.CompressGZIP(file_test_proto_rawDescData)})return file_test_proto_rawDescData
}var file_test_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
var file_test_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_test_proto_goTypes = []interface{}{(ClassName)(0),   // 0: ClassName(*Student)(nil),  // 1: Student(*Students)(nil), // 2: Students
}
var file_test_proto_depIdxs = []int32{0, // 0: Student.cn:type_name -> ClassName1, // 1: Students.person:type_name -> Student2, // [2:2] is the sub-list for method output_type2, // [2:2] is the sub-list for method input_type2, // [2:2] is the sub-list for extension type_name2, // [2:2] is the sub-list for extension extendee0, // [0:2] is the sub-list for field type_name
}func init() { file_test_proto_init() }
func file_test_proto_init() {if File_test_proto != nil {return}if !protoimpl.UnsafeEnabled {file_test_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {switch v := v.(*Student); i {case 0:return &v.statecase 1:return &v.sizeCachecase 2:return &v.unknownFieldsdefault:return nil}}file_test_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {switch v := v.(*Students); i {case 0:return &v.statecase 1:return &v.sizeCachecase 2:return &v.unknownFieldsdefault:return nil}}}type x struct{}out := protoimpl.TypeBuilder{File: protoimpl.DescBuilder{GoPackagePath: reflect.TypeOf(x{}).PkgPath(),RawDescriptor: file_test_proto_rawDesc,NumEnums:      1,NumMessages:   2,NumExtensions: 0,NumServices:   0,},GoTypes:           file_test_proto_goTypes,DependencyIndexes: file_test_proto_depIdxs,EnumInfos:         file_test_proto_enumTypes,MessageInfos:      file_test_proto_msgTypes,}.Build()File_test_proto = out.Filefile_test_proto_rawDesc = nilfile_test_proto_goTypes = nilfile_test_proto_depIdxs = nil
}

2.遇到的问题

ubuntu@VM-0-17-ubuntu:~/go/testpb$ go build
testpb.go:7:2: unknown import path "/home/ubuntu/go/testpb/testpb.go": internal error: module loader did not resolve import
testpb.go:6:2: no required module provides package github.com/golang/protobuf/proto; to add it:go get github.com/golang/protobuf/proto
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go get github.com/golang/protobuf/proto
go get: module github.com/golang/protobuf/proto: Get "https://proxy.golang.org/github.com/golang/protobuf/proto/@v/list": dial tcp 172.217.160.81:443: i/o timeout
ubuntu@VM-0-17-ubuntu:~/go/testpb$
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go env -w GOPROXY=https://goproxy.cn
ubuntu@VM-0-17-ubuntu:~/go/testpb$ go get github.com/golang/protobuf/proto
go: downloading github.com/golang/protobuf v1.5.2
go: downloading google.golang.org/protobuf v1.26.0
go get: added github.com/golang/protobuf v1.5.2

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