How to interrupt/ stop a java ping command in Windows?

Question

I got a sample ping program with a little modification...

    String ip = "192.168.1.1 -t";
    String pingResult = "";      
    String pingCmd = "ping " + ip;

    try{

        Runtime r = Runtime.getRuntime();
        Process p = r.exec(pingCmd);

        Pattern pattern = Pattern.compile("time=(\\d+)ms");
        Matcher m = null;
        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            m = pattern.matcher(inputLine);
            if (m.find()) {
                System.out.println(m.group(1));
            }
        }
        in.close();

    }
    catch (IOException e) {
        System.out.println(e);
    }

I going to implement a GUI which include a start and exit button, the start button works but the exit buttons won't. When I click the exit button, the program do not show the rtt time output. But the program do not actually exit-ed/ stopped. How am I totally to shut it down, am I going to add something likeRuntime.getRuntime().addShutdownHook.

Need some hints and guidelines, thanks in advanced...

score 0 · Accepted Answer · answered Mar 04 '13 at 11:11

0

You can use ping's -n parameter and start after n pings again or stop if user required to halt.

Process has also an OutputStream. You may try to send a Ctrl-C when you want to stop ping.

answered Mar 04 '13 at 11:11

PeterMmm

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thanks, for certainty. Am I going to pass something like char ctrlBreak = (char)3; into the Process p OutputStream? – 薛源少 Mar 04 '13 at 12:02
look here http://stackoverflow.com/questions/1835885/send-ctrl-c-to-process-open-by-java – PeterMmm Mar 04 '13 at 12:14

score 0 · Answer 2 · answered Mar 23 '13 at 19:44

0

boolean isStoped=false;

while ((inputLine = in.readLine()) != null && (!isStoped)) {
            m = pattern.matcher(inputLine);
            if (m.find()) {
                System.out.println(m.group(1));
            }
        }

make isStoped=true and call p.destroy() when you click the exit button. Hope this will help you.

answered Mar 23 '13 at 19:44

user2203120

1

thanks a lot, but the p.destroy() only can stop the print line but not the ping program which run on the background of the Threads... Thanks for the idea... – 薛源少 Mar 24 '13 at 14:20

How to interrupt/ stop a java ping command in Windows?

2 Answers2