如何实现Java RMI以获取未连接的客户端ip /主机名

Question

i have a RMI server and RMI client. If the client is running its version of RMI that i made and is ready to receive connections, how can i on the Server side get the IP/Hostname of the client even if the client is not connected to me?

I was thinking of creating a remote method that will call the client to send their IP/Hostname to my server side, but that would require me to know the Client IP/Hostname to be connected to inorder to invoke the method.

The purpose of this program is to create a monitoring program to monitor what are students doing on their labs, as a teacher.

Answer 1

how can i on the Server side get the IP/Hostname of the client even if the client is not connected to me?

That's a contradiction in terms. If there is no connection there is no current client. If you want a current client during a remote method invocation, see RemoteServer.getClientHost() . If you want that data other than during a remote method invocation, you can collect it during the remote method invocations, but you will have a hard time deciding when to remove a client, unless the client is obliged to call a logout() method or some such. You can clear the collection completely in an Unreferenced.unreferenced() method if that helps. But you need to get rid of the notion of 'connection' in RMI completely. There is basically no such thing. Connections exist for the duration of the call, and for whatever extra extent the implementation requires, but there is no way to get hold of them in either server or client, so you may as well design as though they don't exist, and as though the client doesn't exist except during a remote call.

Or use my Remote Session pattern, try Google.