Use the command line to check the port number under 1. Windows, take the following 8080 port as an example;

The printed result after executing the netstat -aon|findstr 8080 command is as follows:

2. You can see that the port is occupied by the process with process number 5684. Continue with the following command:

The printed results after the tasklist |findstr "5684 "command are as follows:

3. If you need to check other ports. Just change 8080 to the port number you want to query.