是否可以使用Java从Server到.exe客户端（使用C ++编码）读取传入的数据流？

Question

Is it possible to read datastream sent from C++ server program to C++ client over socket connection in java? I have details like port number and server IP.

Or do I need decompile the whole C++ client into Assembly and then somehow translate it into java to do that?

I'm really not sure what kind of data it's transforming, though.. Somebody told me to code HTTP server and run it on my Router but I'm not really sure if that would work?

Here's the diagrammatic way to look at it.

Server generates data.
it puts it in a packet.
it encrypts the packet.
and sends it over the wire.
It gets to a user’s Computer (= client). (I should be in the control now on..)
(If I could somehow read data at this part?)
The client reads the encrypted packet.
(If I could somehow read data at this part?) (The later, the better :D)
The client decrypts the packet.
(If I could somehow read data at this part?) (The later, the better :D)
The client does something.

As said, the client is .exe file and it's coded using C++. And I don't have source code of it.

Answer 1

All you have to do is define well your application protocol. This is, the format of your data stream. As long as you are using the same format in both ends, it doesn't really matter what language or program you are using. Imagine your browser and the web server. They are both using the same application protocol (HTTP) but they are completely different programs. Even more, there exists different web servers and different browsers.

Then, all you need to do is use the java sockets to listen to some specific port, and use your c++ sockets to write to the specific port. Just make sure you know how the information is "organized".