Pinging an IP address in Java | Set 2 (By creating sub-process)

In article Pinging an IP address in Java, we have discussed how to ping an IP address using java.net.InetAddress.isReachable() method. In this post we will discuss how to execute ping command by creating a sub-process.

Prerequisite :
ProcessBuilder class , Process class

Below Java program creates a method commands() which take list of command(ping) as a parameter. As we know ProcessBuilder class is used to create operating system processes and ProcessBuilder.start() starts the sub-process which will execute the ping command.

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// Java program for ping using sub-process
  
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
  
public class PingWebsite
    // method for finding the ping statics of website
    static void commands(ArrayList<String> commandList) 
                                           throws Exception
    
        // creating the sub process, execute system command
        ProcessBuilder build = new ProcessBuilder(commandList);
        Process process = build.start();
          
        // to read the output
        BufferedReader input = new BufferedReader(new InputStreamReader
                                   (process.getInputStream()));
        BufferedReader Error = new BufferedReader(new InputStreamReader
                                   (process.getErrorStream()));
        String s = null;
          
        System.out.println("Standard output: ");
        while((s = input.readLine()) != null)
        {
            System.out.println(s);
        }
        System.out.println("error (if any): ");
        while((s = Error.readLine()) != null)
        {
            System.out.println(s);
        }
    }
      
    // Driver method
    public static void main(String args[]) throws Exception
    
        // creating list for commands
        ArrayList<String> commandList = new ArrayList<String>();
          
        commandList.add("ping");
        // can be replaced by IP
        commandList.add("www.google.com");
          
        PingWebsite.commands(commandList);
    }
}

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Output:

Standard output: 
PING www.google.com (216.58.220.164): 56 data bytes
64 bytes from 216.58.220.164: icmp_seq=0 ttl=53 time=98.803 ms
64 bytes from 216.58.220.164: icmp_seq=1 ttl=53 time=87.856 ms
64 bytes from 216.58.220.164: icmp_seq=2 ttl=53 time=110.600 ms
64 bytes from 216.58.220.164: icmp_seq=3 ttl=53 time=92.897 ms
64 bytes from 216.58.220.164: icmp_seq=4 ttl=53 time=90.142 ms

--- www.google.com ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 87.856/96.060/110.600/8.140 ms
error (if any): 

Reading and Understanding the Output: Each line to the destination represents a packet transission, the time specified in milliseconds at the end is most relevant for testing an internet connection as a higher the number there indicates higher the lag is or a connection problem. If there is no response at all, either the server is down, there is a connection problem, it does not respond to ping requests, or it is very slow to respond.

Output when there is no internet connection: The output of above program become very interesting when our system is not connected to internet
Output:

Standard output: 
error (if any): 
ping: cannot resolve www.google.com: Unknown host

Understanding the term “Packet loss”: Packet loss is high, you almost certainly have network issues, because packet loss means that data being sent between you and the server is being lost. The reason of pocket loss can be poor internet connection, wi-fi problems, general network problems, a bad connection, a struggling connection, an interfered connection, connection interruptions, or many other potential networking issues.
 
Related Article : Pinging an IP address in Java
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