I tried my best and commented the code for you. In case of difficulties, ping me...
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
/**
*
* @author Sam
*/
public class PortChecker {
public static void main(final String... args)
throws InterruptedException, ExecutionException,
FileNotFoundException, IOException {
final ExecutorService es
= Executors.newFixedThreadPool(20);
BufferedReader br = new
BufferedReader(new FileReader("fports"));
final String ip =
br.readLine(); //read ip or hostnaem
final int timeout =
200;
System.out.println(ip);
String port;
final
List<Integer> ports = new ArrayList<>();
while ((port =
br.readLine()) != null) {
ports.add(Integer.parseInt(port)); //read and addd ports
System.out.println(port); //print port
}
final
List<Future<Boolean>> futures = new
ArrayList<>();
ports.stream().forEach((p) -> {
futures.add(portIsOpen(es, ip, p, timeout)); //try for each saved
ports
});
es.shutdown();
System.out.println("\n\n\n");
System.out.println(ip);
PrintWriter pw = new
PrintWriter("fports_results");
for (int i = 0; i <
ports.size(); i++) {
pw.println(ports.get(i) + "\t" + (futures.get(i).get() ? "open" :
"close")); //print port and status as open/clsoe
}
pw.flush();
pw.close();
}
public static Future<Boolean>
portIsOpen(final ExecutorService executorService, final String ip,
final int port, final int timeout) { //to parallelizeand reduce
time
return
executorService.submit(() -> {
try (Socket socket = new Socket()) {
socket.connect(new InetSocketAddress(ip, port), timeout);
return true; //if port open,return true
} catch (Exception ex) {
return false; //if closed
}
});
}
}
Java Language Create file fports with the first line as a hostname that needs to be...
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