Apache Commons CLI提供HelpFormatter类来打印命令行参数的使用指南.见的例子中
CLITester.java
import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; public class CLITester { public static void main(String[] args) throws ParseException { Options options = new Options(); options.addOption("p", "print", false, "Send print request to printer.") .addOption("g", "gui", false, "Show GUI Application") .addOption("n", true, "No. of copies to print"); HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("CLITester", options); } }
输出结果:
java CLITester usage: CLITester -g,--gui Show GUI Application -n <arg> No. of copies to print -p,--print Send print request to printer.