没有客户端的服务器侦听端口Java

Question

I am looking for a way to have a basic Java Server listen to a port without having any clients connected. Essentially, I need to be listening on this port for any data, then output it on the server side to see that it actually works. As there are multiple ways to implement Java App servers, I am not sure which would be the best.

Current thought flow: A client is able to connect to a server socket because the server is listening for a connection. Can it be so that it can be changed to listen to data? Instead of a client socket connection?

Code can be provided if needed but I just used a basic server example found online (using sockets).

Answer 1

开始接收数据之前，必须在服务器和客户端套接字之间建立连接。