例如，这是你
commons-cli用来解析2个字符串参数的方法：
import org.apache.commons.cli.*;public class Main { public static void main(String[] args) throws Exception { Options options = new Options(); Option input = new Option("i", "input", true, "input file path"); input.setRequired(true); options.addOption(input); Option output = new Option("o", "output", true, "output file"); output.setRequired(true); options.addOption(output); CommandLineParser parser = new DefaultParser(); HelpFormatter formatter = new HelpFormatter(); CommandLine cmd; try { cmd = parser.parse(options, args); } catch (ParseException e) { System.out.println(e.getMessage()); formatter.printHelp("utility-name", options); System.exit(1); } String inputFilePath = cmd.getOptionValue("input"); String outputFilePath = cmd.getOptionValue("output"); System.out.println(inputFilePath); System.out.println(outputFilePath); }}从命令行使用：
$> java -jar target/my-utility.jar -i asd Missing required option: ousage: utility-name -i,--input <arg> input file path -o,--output <arg> output file
