Apache Commons CLI - 幫助示例

Apache Commons CLI 提供了 HelpFormatter 類來列印與命令列引數相關的幫助。請參見示例。

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();
   }
}

輸出

執行檔案，然後檢視結果。

java CLITester
usage: CLITester [-g] [-n <arg>] [-p]