Java命令行解析：apache commons-cli

时间：2023-07-08 18:07:19

http://commons.apache.org/proper/commons-cli/usage.html

Apache Commons CLI用于解析命令行选项，也可以输出详细的选项说明信息。

Commons CLI 支持多种选项类型：

  • POSIX like options (ie. tar -zxvf foo.tar.gz)
  • GNU like long options (ie. du --human-readable --max-depth=1)
  • Java like properties (ie. java -Djava.awt.headless=true -Djava.net.useSystemProxies=true Foo)
  • Short options with value attached (ie. gcc -O2 foo.c)
  • long options with single hyphen (ie. ant -projecthelp)

Commons CLI处理过程可以分成三个阶段

  • 定义阶段，Options类。
  • 解析阶段，使用CommandLineParser类讲String[] args解析为CommandLine
  • 查询阶段，调用CommandLine对象的方法，查询和提取特定选项。

命令行选型定义

Options options = new Options();

options.addOption("h", "help", false, "Print this usage information");

options.addOption("v", "verbose", false, "Print out VERBOSE information" );

options.addOption("p", false, "no error if existing, make parent directories as needed.");

options.addOption(OptionBuilder.withArgName("file")

                .hasArg()

                .withDescription("search for buildfile towards the root of the filesystem and use it")

                .create("O"));

options.addOption(OptionBuilder.withLongOpt("block-size")

                .withDescription("use SIZE-byte blocks")

                .withValueSeparator('=')

                .hasArg()

                .create() );

解析

CommandLineParser parser = new BasicParser( );

CommandLineParser parser = new PosixParser();

CommandLine commandLine = parser.parse( options, args );

选型查询和提取

  if( commandLine.hasOption('f') ) {

    file = commandLine.getOptionValue('f');

  }  

  String[] str = commandLine.getArgs();

显示帮助信息

HelpFormatter formatter = new HelpFormatter();

formatter.printHelp("xxcmd [-lkjs] PATH", "", options , "");

formatter.printHelp( "ant", options );

formatter.printHelp( "ant", options, true ); //generate a usage statment as well as the help information

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