Jopt Simple Java Framework Guide

Jopt Simple is a simple and easy -to -use Java command line parameter parsing framework that helps developers to handle command line parameters elegantly and provide rich configuration options.This article provides you with a guide to use the job simple framework to help you better understand and use the framework. ## 1. Frame introduction Jopt Simple is an open source Java library for analysis and processing command line parameters.It provides a simple API, which can easily convert the command line parameters into the Java object.JOPT SIMPLE supports various types of parameters, including Boolean, integer, floating -point, string type, etc. At the same time, it also supports the default value settings and parameter verification of parameters. ## 2. Get and import Jopt Simple You can download the latest version of Jopt Simple from Jopt Simple's official website (https://pholser.github.io/jopt-simple/).After decompressing the download file, import jar file into your Java project in order to start using Jopt Simple. ## 3. Basic usage The basic steps of using the JOPT SIMPLE framework parsing the command line parameters are as follows: ### 3.1 Create OptionParser object First, you need to create an OptionParser object to analyze the command line parameters.OptionParser is the core class of the Jopt Simple framework, which is responsible for parsing and configured command line parameters. OptionParser parser = new OptionParser(); ### 3.2 Add parameters Next, you can add command line parameters using the addOption () method of OptionParser.The parameters of the method specify the short options, long options, description information, etc. of the parameters. Parser.addoption ("o", "output", true, "output file path"); Parser.addoption ("v", "VERBOSE", FALSE, "Sely Display Details"); ### 3.3 Analysis parameter The parsing command line parameters are very simple. Just call the PARSE () method of OptionParser and pass the command line parameters. OptionSet options = parser.parse(args); ### 3.4 Use the resolution results After analyzing the command line parameters, you can obtain the value of the parameter according to the method of the Optionset object. if (options.has("output")) { String outputPath = (String)options.valueOf("output"); System.out.println ("Output file path:" + outputpath); } if (options.has("verbose")) { System.out.println ("Show Details"); } ## 4. Advanced usage In addition to basic usage, Jopt Simple also provides more advanced functions to meet different needs. ### 4.1 parameter type Jopt Simple supports a variety of common parameter types, including Boolean, integer, floating -point, string type, etc.You can analyze the corresponding type of command line parameters by passing appropriate parameter types. parser.accepts("age").withRequiredArg().ofType(Integer.class).required(); parser.accepts("name").withOptionalArg().ofType(String.class).defaultsTo("John Doe"); ### 4.2 Parameter verification Jopt Simple allows you to verify the parameters to ensure that the input parameters meet the requirements.You can use the WithvaluesConvertedBy () method and custom verification device to complete parameter verification. OptionSpec<Integer> ageSpec = parser.accepts("age").withRequiredArg().ofType(Integer.class) .withValuesConvertedBy(new AgeValidator()); ### 4.3 multi -line description For multiple lines of description information, you can use the useScript () method of OptionDescriptor to set the description information of the parameter. Optionspec <void> Helpspec = Parser.Accepts ("Help"). Forhelp (). WithDescripting ("Show helping information. For more details, please refer to the user manual."); ## 5. Summary This article introduces the basic use and advanced function of the job simple framework.By using JOPT SIMPLE, you can easily handle and analyze the command line parameters to improve the easy -to -use and configurable program.I hope this article can help you better understand and use the Jopt Simple framework. The demonstration effect of the example code is for reference only. Please adjust the specific usage and implementation method according to the actual needs.Detailed API documents and example code can be found on the official website of Jopt Simple.Wish you success when you use Jopt Simple!