Reputation: 1

Response time out when pinging an IP address in Java

Here is what I use to ping an IPv4-Address and to record the actual response time in ms. Unfortunately I never get a valid response.. The request always times out. 0 is always returned. Please help :)

private long pingHost(String host, int port) {
    try {                   
        Inet4Address inet4 = (Inet4Address)InetAddress.getByName(host);         
        long start = System.currentTimeMillis();
        if(inet4.isReachable(5000)){
            long end = System.currentTimeMillis();
            long total = end-start;
            System.out.println(total);
            return total;
        }   

    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return 0;

}

Upvotes: 0

Answers (3)

CamelTM

Reputation: 1250

May be use Socket? Something like this:

class PingTask implements Runnable {

    private int timeout;
    private Target target;// has InetSocketAddress field (getAddress()...)

    PingTask(Target target, int timeout) {
            this.target = target;
            this.timeout = timeout;
    }

    public String getHost() {
            return target.getAddress().getAddress() + ":" + target.getAddress().getPort();
    }

    @Override
    public void run() {
            Socket connection = new Socket();
            boolean reachable;
            long start = System.currentTimeMillis();
            try {
                    try {
                            connection.connect(target.getAddress(), timeout);
                    } finally {
                            connection.close();
                    }
                    long dur = (System.currentTimeMillis() - start);
                    System.out.printf("%5d ms %s%n", dur, target.getAddress().getHostString() );
                    reachable = true;
            } catch (Exception e) {
                    reachable = false;
            }

            if (!reachable) {
                    System.out.println(
                            String.format(
                                    "\t%s was UNREACHABLE",
                                    getHost()
                            )
                    );
            }
    } }

Upvotes: 0