private static final Options OPTIONS = generateOptions();

public static void main(String[] args) {

printUsage(OPTIONS);

printHelp(OPTIONS);

Scanner scanner = new Scanner(System.in);

while (true) {

String readLine = scanner.nextLine();

if ("exit".equals(readLine)) {

break;

}

String[] arguments = readLine.substring(5).split("\\s");

try {

CommandLine commandLine = generateCommandLine(OPTIONS, arguments);

Option[] options = commandLine.getOptions();

for (Option option : options) {

System.out.println(option);

System.out.println(String.format("Option : %s | value : %s", option.getOpt(), option.getValue()));

}

} catch (ParseException e) {

// ignore

}

}

}

private static CommandLine generateCommandLine(final Options options, final String[] commandLineArguments) throws ParseException {

final CommandLineParser cmdLineParser = new DefaultParser();

CommandLine commandLine = null;

try {

commandLine = cmdLineParser.parse(options, commandLineArguments);

} catch (ParseException parseException) {

System.err.println(("ERROR: Unable to parse command-line arguments " + Arrays.toString(commandLineArguments) + " due to: " + parseException.getMessage()));

throw parseException;

}

return commandLine;

}

private static Options generateOptions() {

final Option helpOption = Option.builder("h").required(false).hasArg(false).longOpt("help").desc("Display help messages").build();

final Option verboseOption = Option.builder("v")

.required(false)

.hasArg(false)

.longOpt("VERBOSE_OPTION")

.desc("Print status with verbosity.").build();

final Option fileOption = Option.builder("f")

.required()

.longOpt("FILE_OPTION")

.hasArg()

.desc("File to be processed.")

.build();

return new Options().addOption(verboseOption).addOption(fileOption).addOption(helpOption);

}

private static void printUsage(final Options options) {

final HelpFormatter formatter = new HelpFormatter();

final String syntax = "Main";

System.out.println("\n=====");

System.out.println("USAGE");

System.out.println("=====");

final PrintWriter pw = new PrintWriter(System.out);

formatter.printUsage(pw, 80, syntax, options);

pw.flush();

}

private static void printHelp(final Options options) {

final HelpFormatter formatter = new HelpFormatter();

final String syntax = "Main";

final String usageHeader = "Example of Using Apache Commons CLI";

final String usageFooter = "See http://marxsoftware.blogspot.com/ for further details.";

System.out.println("\n====");

System.out.println("HELP");

System.out.println("====");

formatter.printHelp(syntax, usageHeader, options, usageFooter);

}