apache-comnons系列之commons-cli1.4 学习笔记

概述

• 参考
  
  • https://segmentfault.com/a/1190000006795206
• CommandLineParser
  
  • A class that implements the CommandLineParser interface can parse a String array according to the {@link Options} specified and return a {@link CommandLine}.
• DefaultParser
  
  • Default parser.
• Option
  
  • Describes a single command-line option. It maintains information regarding the short-name of the option, the long-name,
    if any exists, a flag indicating if an argument is required for this option, and a self-documenting description of the option.
• Options
  
  • Options represents a collection of {@link Option} objects, which describe the possible options for a command-line.
• OptionGroup
  
  • A group of mutually exclusive options.
  • optionMap = new LinkedHashMap

测试

• org.apache.commons.cli.OptionTest
  
  • opt—-the name of the option
  • longOpt—-the long representation of the option
  • argName—-the name of the argument for this option
  • description/required
  • numberOfArgs
    
    • the number of argument values this option can have
  • valuesep
    
    • the character that is the value separator
  • List values = new ArrayList();—-the list of argument values
  • acceptsArg
    
    • Tells if the option can accept more arguments.
• org.apache.commons.cli.OptionsTest
  
  • shortOpts/longOpts/requiredOpts/optionGroups
• org.apache.commons.cli.CommandLineTest
  
  • args = new LinkedList();/options = new ArrayList();
  • args用于接收无法处理的参数
• org.apache.commons.cli.DefaultParserTest
• org.apache.commons.cli.ParserTestCase
  
  • Option currentOption—-The last option parsed.(表示期望解析参数的option)
  • parse流程
    
    • handleToken
    • currentOption.addValueForProcessing
      
      • processValue
      • add(value);
  • handleUnknownToken
    
    • cmd.addArg(token);