Java-不带端口转发的ServerSocket

Question

I'm making a Java application that involves every user hosting a small server. This allows the other clients to, with each others IPs check what they're doing.

But of course this needs port-forwarding to work, which people often have trouble with.

So, is there a way to work without port-forwarding, while still having a full-performance connection?

Answer 1

对于具有直接连接或有效端口转发配置的中央服务器（用户向该服务器打开连接），该用户是一种隧道，该服务器如何处理？