协议缓冲区中的Java HashMap

Question

I am new to the Google protocol buffer. The intention is to use proto files to generate java classes that can be sent over network. Is there a way to have java Maps in the generated classes? Any example code for it will be extremely useful. The generated java class should contain a member variable of type Map of key values.

Answer 1

There is an issue, regarding this in google https://code.google.com/p/protobuf/issues/detail?id=299

The last message from October 9, 2014

Project Member #4 xiaof...@google.com A new syntax for map fields will be introduced to protobuf: message TestMessage { map a_map_field = 1; }

We are currently working on its implementation and it's supposed to be included in the next major release.

So either wait for new release, or implement your own tuples, with appropriate key and value structures.

Look at similar question How would you encode a Map<String, Object> using Protocol Buffers?