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Sunday, 1 July 2018

Apache Commons CLI - Properties Option

Apache Commons CLI - Properties Option

A Properties option is represented on a command line by its name and its corresponding properties like syntax similar to java properties file. Consider the following example, if we're passing options like -DrollNo=1 -Dclass=VI -Dname=Mahesh, we should process each value as properties. Let's see the implementation logic in action.

import java.util.Properties;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.Option;
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();

      Option propertyOption   = Option.builder()
         .argName("property=value" ) 
         .desc("use value for given properties" )


      CommandLineParser parser = new DefaultParser();
      CommandLine cmd = parser.parse( options, args);

      if(cmd.hasOption("D")) {
         Properties properties = cmd.getOptionProperties("D");
         System.out.println("Class: " + properties.getProperty("class"));
         System.out.println("Roll No: " + properties.getProperty("rollNo"));
         System.out.println("Name: " + properties.getProperty("name"));


Run the file while passing options as key value pairs and see the result.
java CLITester -DrollNo=1 -Dclass=VI -Dname=Mahesh
Class: VI
Roll No: 1
Name: Mahesh

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