LightBlog
Contact at mumbai.academics@gmail.com or 8097636691/9323040215
Responsive Ads Here

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.

Example

CLITester.java
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()
         .longOpt("D")
         .argName("property=value" ) 
         .hasArgs()
         .valueSeparator()
         .numberOfArgs(2)
         .desc("use value for given properties" )
         .build();

      options.addOption(propertyOption);

      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"));
      }
   }
}

Output

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

No comments:

Post a Comment