protobuf 解码中的非法组结束指示符错误 [英] Illegal group end indicator error in protobuf decode

问题描述

当我尝试使用 protobuf.js decode 解码 bytearray 时出现以下错误

I am getting the following error when i try to decode bytearray using protobuf.js decode

错误:消息的非法组结束指示符.SampleMessage:1749(不是组)在错误(本机)在 ProtoBuf.Reflect.MessagePrototype.decode (http://127.0.0.0.1:53259/libs/protobuf/dist/ProtoBuf.js:3168:31)在 Function.Message.decode (http://127.0.0.1:53259/libs/protobuf/dist/ProtoBuf.js:2896:37)

error: Illegal group end indicator for Message .SampleMessage: 1749 (not a group) at Error (native) at ProtoBuf.Reflect.MessagePrototype.decode (http://127.0.0.1:53259/libs/protobuf/dist/ProtoBuf.js:3168:31) at Function.Message.decode (http://127.0.0.1:53259/libs/protobuf/dist/ProtoBuf.js:2896:37)

代码片段:sample.proto - 文件

code snippet: sample.proto - file

message SampleMessage {
    required string text = 1;
}

Java 代码用于编码:

 SampleMessage msg = SampleProto.SampleMessage.newBuilder().setText("test data ").build();
 ObjectOutputStream out = new ObjectOutputStream(response.getOutputStream());
 out.writeObject(msg);
 out.flush();

使用 javascript 解码:

var ProtoBuf = dcodeIO.ProtoBuf;
var SampleMessage = ProtoBuf.loadProtoFile("com/cm/model/sample.proto").build("SampleMessage");  
var msg = SampleMessage.decode(response.data);

推荐答案

我强烈怀疑是这个问题:

I strongly suspect that this is the problem:

ObjectOutputStream out = new ObjectOutputStream(response.getOutputStream());
out.writeObject(msg);

你为什么使用 ObjectOutputStream?这是针对 Java 的本机二进制序列化协议，它与协议缓冲区不同.尽管 protobuf some 支持 Java 的序列化(这样如果您已经在使用内置序列化，您仍然可以序列化 protobuf 消息)您不应该使用它，除非您正在使用双方的Java序列化.

Why are you using ObjectOutputStream? That's for Java's native binary serialization protocol, which isn't the same as Protocol Buffers. Even though protobuf has some support for Java's serialization (so that if you're already using the built-in serialization, you can still serialize protobuf messages) you shouldn't be using that unless you're using Java serialization at both sides.

你应该使用

SampleMessage msg = SampleProto.SampleMessage.newBuilder().setText("test data ").build();
msg.writeTo(response.getOutputStream());

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