org.apache.commons.cli.HelpFormatter#printUsage ( )源码实例Demo

public static void showUsage(HelpFormatter format, PrintWriter err, String name, Command command) {
  Options options = mergeOptions(OPTIONS, command.getOptions());
  String[] usage = command.getUsageDescription();

  String ustr = name + " [option...]";
  if (usage != null && usage.length >= 1) {
    ustr = ustr + " " + usage[0];
  }

  format.printWrapped(err, WIDTH, name + ":\n" + command.getCommandDescription());
  format.printUsage(err, WIDTH, ustr);
  format.printWrapped(err, WIDTH, LEFT_PAD, "where option is one of:");
  format.printOptions(err, WIDTH, options, LEFT_PAD, DESC_PAD);

  if (usage != null && usage.length >= 2) {
    for (int i = 1; i < usage.length; ++i) {
      format.printWrapped(err, WIDTH, LEFT_PAD, usage[i]);
    }
  }
}
 

public static void showUsage(HelpFormatter format, PrintWriter err, String name, Command command) {
  Options options = mergeOptions(OPTIONS, command.getOptions());
  String[] usage = command.getUsageDescription();

  String ustr = name + " [option...]";
  if (usage != null && usage.length >= 1) {
    ustr = ustr + " " + usage[0];
  }
    
  format.printUsage(err, WIDTH, ustr);
  format.printWrapped(err, WIDTH, LEFT_PAD, "where option is one of:");
  format.printOptions(err, WIDTH, options, LEFT_PAD, DESC_PAD);

  if (usage != null && usage.length >= 2) {
    for (int i = 1; i < usage.length; ++i) {
      format.printWrapped(err, WIDTH, LEFT_PAD, usage[i]);
    }
  }
}
 

private static String getOptionsHelpForUsage() {
  HelpFormatter formatter = new HelpFormatter();
  StringWriter stringWriter = new StringWriter();
  PrintWriter printWriter = new PrintWriter( stringWriter );
  formatter.printUsage( printWriter, 999, "", options );
  return stripOff( stringWriter.toString(), "usage: " ); // Strip off the "usage:" so it can be localized
}
 

private static void printUsage(final Options options) {
	final HelpFormatter formatter = new HelpFormatter();
	final String syntax = "mlplan";
	final PrintWriter pw = new PrintWriter(System.out);
	formatter.printUsage(pw, 400, syntax, options);
	pw.println("use -h or --help for help");
	pw.flush();
}
 

private static void usage(HelpFormatter help, PrintWriter pw, CommandLineParser cli, Options opts) {
    StringWriter sw = new StringWriter();
    PrintWriter upw = new PrintWriter(sw);
    help.printUsage(upw, HelpFormatter.DEFAULT_WIDTH, "", opts);
    if (cli instanceof TreeParser) {
        upw.print(" ");
        TreeParser tp = (TreeParser) cli;
        String[] keys = tp.getParsers().keySet().toArray(new String[tp.getParsers().size()]);
        if (keys.length > 0 && !tp.isRequired()) {
            upw.print("[ ");
        }

        for (int i = 0; i < keys.length; ++i) {
            String key = keys[i];
            ParserOptions value = tp.getParsers().get(key);
            upw.print("(" + key);
            usage(help, upw, value.getParser(), value.getOptions());
            upw.print(")");
            if (i != keys.length - 1) {
                upw.print(" | ");
            }
        }

        if (keys.length > 0 && !tp.isRequired()) {
            upw.print(" ]");
        }

        Argument[] args = tp.getArgs().toArray(new Argument[tp.getArgs().size()]);
        if (args.length > 0) {
            String[] argss = new String[tp.getArgs().size()];
            for (int i = 0; i < args.length; ++i) {
                Argument arg = args[i];
                argss[i] = arg.isRequired() ? "<" + arg.getName() + ">" : "[" + arg.getName() + "]";
            }
            upw.print(" " + String.join(" ", argss));
        }
    }
    pw.println(sw.toString().replaceAll("usage:( )?", "").replace("\n", ""));
}
 

private static String getOptionsHelpForUsage() {
  HelpFormatter formatter = new HelpFormatter();
  StringWriter stringWriter = new StringWriter();
  PrintWriter printWriter = new PrintWriter( stringWriter );
  formatter.printUsage( printWriter, 999, "", options );
  return stripOff( stringWriter.toString(), "usage: " ); // Strip off the "usage:" so it can be localized
}
 

private void printUsage(final Options options) {
  final HelpFormatter formatter = new HelpFormatter();
  formatter.printUsage(this.writer, CHARACTERS_PER_LINE, SingleTaskRunnerMain.class.getSimpleName(), options);
}
 

/**
 * Prints the command line usage to the std error output
 * 
 * @param e
 *            The error that raised the help message
 * @param cmdLine
 *            The command line usage
 * @param options
 *            The options expected
 */
public static void printUsage(ParseException e, String cmdLine,
		Options options) {
	System.err.println(e.getMessage());
	// automatically generate the help statement
	HelpFormatter formatter = new HelpFormatter();
	PrintWriter pw = new PrintWriter(System.err);
	formatter.printUsage(pw, cmdLine.length() + 7, cmdLine, options);
	pw.flush();
}