Generally you cannot control ports, its sort of a first come first served. If you want to listen at a port say 3306, just try and open a server socket on it, if the process of binding fails its because its already in use.
RMI runs at a specific port, and so perhaps your question is about client side sockets in which case you only need to make sure that the RMI service is running?
Assuming u want to find out if RMI is running, u cud try establishing an RMI service at that port, if it fails because of a "Refused to connect" Exception, then RMI is not running
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一般来说，您无法控制端口，它是先到先得的。 如果您想侦听端口（例如 3306），只需尝试在其上打开服务器套接字，如果绑定过程失败，因为它已在使用中。
RMI 在特定端口运行，因此您的问题可能是关于客户端套接字，在这种情况下您只需要确保 RMI 服务正在运行？
假设你想知道 RMI 是否正在运行，你可以尝试在该端口建立 RMI 服务，如果由于“拒绝连接”异常而失败，则 RMI 没有运行
Generally you cannot control ports, its sort of a first come first served. If you want to listen at a port say 3306, just try and open a server socket on it, if the process of binding fails its because its already in use.
RMI runs at a specific port, and so perhaps your question is about client side sockets in which case you only need to make sure that the RMI service is running?
Assuming u want to find out if RMI is running, u cud try establishing an RMI service at that port, if it fails because of a "Refused to connect" Exception, then RMI is not running