Is there a way for a java chat client program to dynamically find the host server?

Question

我只想执行一个没有端口号以外参数的客户端实例，让程序找到服务器在网络上任何地方侦听该端口。

Answer 1

You can use UDP multi-cast to find the server. You can send a UDP packet to the port and have the server respond with its IP address. (This effectively hard codes a multi-cast address) which is not much better than hardcoding a hostname which can be looked up via DNS.