📅  最后修改于: 2020-11-18 08:02:36             🧑  作者: Mango
Apache Commons CLI提供了HelpFormatter类来打印与命令行参数相关的帮助。参见示例。
CLITester.java
import java.io.PrintWriter;
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();
final PrintWriter writer = new PrintWriter(System.out);
formatter.printUsage(writer,80,"CLITester", options);
writer.flush();
}
}
运行文件并查看结果。
java CLITester
usage: CLITester [-g] [-n ] [-p]