Ping multiple servers in Java [duplicate]

Answer 1

How about doing without ProcessBuilder as suggested by others also.

I have three classes - PingParallel is my main class, PingTask is the task performed by each thread, and PingResult is having result code (we can add some more info also, status message etc.).

PingParallel

package com.test.thread;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class PingParallel {

    public static void main(String[] args) {
        int totalIps = 89;
        ExecutorService executor = Executors.newFixedThreadPool(totalIps);
        List> list = new ArrayList>();
        Callable callable = null;
        for(int i=0; i< totalIps; i++){
            callable = new PingTask("127.0.0"+i); // Get the ipAddres buttons[i].getText());
            Future future = executor.submit(callable);
            list.add(future);
        }
        for(Future fut : list){
            try {
                System.out.println(new Date()+ "::"+fut.get());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        executor.shutdown();
    }
}

PingTask

package com.test.thread;

import java.net.InetAddress;
import java.util.concurrent.Callable;

public class PingTask implements Callable {

  private String ipAddress;

  public PingTask(String ipAddress) {
    this.ipAddress = ipAddress;
  }

  @Override
  public PingResult call() {
    InetAddress inet = null;
    try {
      inet = InetAddress.getByName(ipAddress);
      int resultCode = inet.isReachable(5000) ? 0 : -1;
      return new PingResult(ipAddress, resultCode);
    } catch (Exception e) {
      e.printStackTrace();
      return new PingResult(ipAddress, -1);
    }
  }
}

PingResult

package com.test.thread;

public class PingResult {

  private String ipAddress;
  private int resultCode;

  public PingResult(String ipAddress, int resultCode) {
    this.ipAddress = ipAddress;
    this.resultCode = resultCode;
  }

  public String getIpAddress() {
    return ipAddress;
  }

  public int getResultCode() {
    return resultCode;
  }

  public String toString() {
    return "IpAddress :: "+ ipAddress + " Result Code : "+ resultCode;
  }
}