Find which application is using a port...

Question

Is there a way to find out the application that is using a port? (Pure Java or JNI)
Also, I would like to know the protocol being used on the port, is that possible?

Answer 1

Hi,
as mentioned before my ejb. I think it is the best approach to use a command line approach from java using the "netstat" and read the standar output stream and parse it according to your need
something like that; it is up to your implementation to parse the output from the standard stream
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class Main {
     public static void main(String[] args) throws InterruptedException, IOException {
            Process process = Runtime.getRuntime().exec("netstat -a");
            InputStream is = process.getInputStream();
            InputStream err = process.getErrorStream();
            BufferedReader bri = new BufferedReader(new InputStreamReader(is));
            BufferedReader errReader = new BufferedReader(new InputStreamReader(err));     
            Thread t1 = new Thread(new StreamEmptier(bri));
            t1.start();
            Thread t2 = new Thread(new StreamEmptier(errReader));
            t2.start();
            process.waitFor();
     class StreamEmptier implements Runnable {
          private BufferedReader reader;
          public StreamEmptier(BufferedReader reader) {
               this.reader = reader;
          public void run() {
               String line = null;
               try {
                    while ((line = reader.readLine()) != null) {
                         System.out.println(line);
               } catch (IOException ioe) {
                    ioe.printStackTrace();
               } finally {
                    try {
                         reader.close(); // close the stream
                    } catch (IOException ioe) {
                         ioe.printStackTrace();
               }// finally
     }Regards,
Alan Mehio
London,UK
Edited by: alan_mehio on 15-Dec-2008 18:37