Java, windows: Get process name of given PID

Question

Running on windows.

I need to know from within my program which processes (like Skype) are running on port :80.

I should be able to get the PID of the process running on port :80 via

netstat -o -n -a | findstr 0.0:80.

What would be the best way to get the name of a process with a given PID from within Java?

If there is any way to get the name of the process running on port :80 from within Java I would prefere that also.

The reason I need this is that my application launches a jetty web server which uses port :80. I want to warn the user that an other service is already running port :80 in case.

Answer 1

If you use Java 10 or above, the enhanced process API can help you use PID to obtain the process name (Or other process information), such as:

import java.io.File;

class Scratch {
    public static void main(String[] args) {
        // Tips: In actual use, you should check whether the value of option exists. The process may have ended at the time of acquisition.

        // Obtain the processhandle corresponding to the process through the PID.
        ProcessHandle processHandle = ProcessHandle.of(6312).orElseThrow();
        // `processHandle.info().command()` will return the executable path of the process
        String command = processHandle.info().command().orElseThrow();
        System.out.println(command);
        // Using File, you can obtain the executable file information later,
        // or you can directly split the path to obtain the process name.
        // System.out.println(command.substring(command.lastIndexOf(File.separator) + 1));
        File exeFile = new File(command);
        System.out.println(exeFile.getName());
    }
}