在 java 协议缓冲区中导入“google/protobuf/descriptor.proto”
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Importing "google/protobuf/descriptor.proto" in java protocol buffers
提问by Jan Zyka
I have a .protofile definition which needs to import "google/protobuf/descriptor.proto"because I use Custom Options.
我有一个.proto需要导入的文件定义，"google/protobuf/descriptor.proto"因为我使用了Custom Options。
So in my .protofile I do:
所以在我的.proto文件中，我这样做：
import "google/protobuf/descriptor.proto";
package ...;
...
Since my file didn't compile complaining about the dependency, I got a copy of the descriptor.proto file placing it in the same directory my proto file was.
由于我的文件没有编译抱怨依赖项，我得到了一个 descriptor.proto 文件的副本，将它放在我的 proto 文件所在的同一目录中。
This solved the problem but I don't believe this is the correct way. Now the descriptor.protogets compiled together with my .protofile resulting in having 2 compiled descriptor.protoat runtime:
这解决了问题，但我不相信这是正确的方法。现在descriptor.proto与我的.proto文件一起编译descriptor.proto，导致在运行时编译了2 个：
- the one shipped with the
protobuf-java-2.5.0.jarfile - the one which was compiled together with my
.protofile
protobuf-java-2.5.0.jar文件附带的那个- 与我的
.proto文件一起编译的那个
I think the --proto-pathoption should be used somehow but not entirely sure what is the correct way.
我认为--proto-path应该以某种方式使用该选项，但不完全确定正确的方法是什么。
Thanks for the best practise tip here!
感谢这里的最佳实践提示！
采纳答案by Bruce Martin
When I have used descriptor in a .proto, I have used it like
当我在 .proto 中使用描述符时，我使用它就像
import "google/protobuf/descriptor.proto";
message AddressBook {
required google.protobuf.FileDescriptorSet proto_files = 1;
Then to generate the java (on windows) with addressbookSD.proto in the default directory:
然后在默认目录中使用 addressbookSD.proto 生成 java（在 Windows 上）：
protoc addressbookSD.proto --java_out=./ --proto_path=./ --proto_path=<protobuf-install-directory>\src
where <protobuf-install-directory> is the protocol buffers install directory. The key point is descriptor.proto is in
其中 < protobuf-install-directory> 是协议缓冲区安装目录。关键是descriptor.proto在
<protobuf-install-directory>\src\google\protobuf
The levels in an protobuf import stament must match directories in the File system just like they would in java.
protobuf 导入语句中的级别必须与文件系统中的目录匹配，就像它们在 java 中一样。
So I use <protobuf-install-directory>\srcas the import directory, The directory structure must be
所以我使用< protobuf-install-directory>\src作为导入目录，目录结构必须是
<protobuf-install-directory>\src
+-- google
+-- protobuf
+-- descriptor.proto
回答by JonasVautherin
Just for the record: I had the same problem recently, and in my case my project depends on protobuf-lite. Apparently, protobuf needed the 'full' protobuf for the custom extensions, and therefore I had to add the dependency, as shown here:
仅供记录：我最近遇到了同样的问题，就我而言，我的项目依赖于protobuf-lite. 显然，protobuf 需要用于自定义扩展的“完整”protobuf，因此我必须添加依赖项，如下所示：
dependencies {
protobuf "io.grpc:grpc-protobuf:${grpcVersion}"
...
}
Note that I depend on gRPC in my project, but that works with com.google.protobuf, too.
请注意，我在我的项目中依赖于 gRPC，但这也适用于com.google.protobuf。
