Java/Network Protocol/Ping

java.net.InetAddress.isReachable(int) can be used to check if a server is reachable or not.

 
import java.net.InetAddress;
public class Main {
  public static void main(String[] argv) throws Exception {
    InetAddress address = InetAddress.getByName("web.mit.edu");
    System.out.println("Name: " + address.getHostName());
    System.out.println("Addr: " + address.getHostAddress());
    System.out.println("Reach: " + address.isReachable(3000));
  }
}

Ping a host

 
 
import java.net.InetAddress;
public class Main {
  public static void main(String[] args) throws Exception {
    InetAddress address = InetAddress.getByName("17.16.15.14");
    boolean reachable = address.isReachable(10000);
    System.out.println("Is host reachable? " + reachable);
  }
}