Java to check whether the native port is occupied

I remember when I was writing a program, I once needed to check the occupation of the port. Although I wouldn't, someone would. So find relevant articles on the Internet, as follows.

127.0. 0.1 stands for local

The main principles are:

If a socket can be established for a specific port number of the host, it indicates that the port of the host is in use.

The output results are as follows:

The above is the example source code of this article on how to check whether the port is occupied. I hope it will be helpful to you.