The technical principle of the Chicory CLI framework and its application in the Java class library

The Chicory CLI (Command-Line Interface) framework is a tool to create and manage the command line interface in Java applications.It enables developers to easily add the command line function to their applications, so that the user can perform various operations through the command line. The technical principles of the Chicory CLI framework are as follows: 1. Note drive: Chicory Cli uses annotations to define the command line options and commands.Developers can mark them by adding annotations to methods and fields to input or output as command line parameters. 2. Command analysis: Chicory Cli uses parsers to analyze the command line parameters and map them to the Java object.The parser will automatically convert the command line parameters to the attributes of the Java object according to the annotation configuration. 3. Parameter verification: Chicory Cli provides parameter verification function to verify the command line parameters entered by the user.Developers can use annotations to define the verification rules of parameters and verify before parsing and executing commands. 4. Command execution: The Chicory CLI framework executes the command by calling the Java method.Developers can handle the command line parameters in the method and perform corresponding logic. The application of the Chicory CLI framework in the Java library mainly includes the following aspects: 1. Command line tool: Chicory Cli enables developers to easily create command line tools so that users can perform various operations on the command line interface, such as file processing, data conversion, system management, etc.Developers can define the command line options and commands by simply annotation configuration, and then use the Chicory CLI command to execute the function to process the user input and perform the corresponding operation. 2. Custom script: The Chicory CLI framework can be used to create a custom script interpreter.Developers can analyze and execute custom script files using the Chicory CLI commands to analyze and execute functions.By defining specific annotations and methods, custom grammar and commands can be achieved, thereby providing more flexible and powerful script functions. 3. Command line testing tool: The Chicory CLI framework can be used as the basis for the command line test tool.Developers can use the Chicory CLI command parsing and execution functions to simulate and test command line operations to ensure their correctness and stability. The following is a sample code that shows the process of creating a simple command line tool using the Chicory CLI framework: import com.github.rvesse.airline.annotations.Command; import com.github.rvesse.airline.annotations.Option; import com.github.rvesse.airline.Cli; @Command(name = "hello", description = "Prints a greeting message") public class HelloCommand implements Runnable { @Option(name = {"-n", "--name"}, description = "Your name") private String name; @Override public void run() { if (name != null && !name.isEmpty()) { System.out.println("Hello, " + name + "!"); } else { System.out.println("Hello, world!"); } } public static void main(String[] args) { Cli<Runnable> cli = Cli.<Runnable>builder("hello") .withCommand(HelloCommand.class) .build(); cli.parse(args).run(); } } In this example, we created a command line tool called "Hello".It has an optional parameter "-N" or "--name", which is used to specify the name of the receiver who wants to print.If the name is not given, the default is printed "Hello, World!" By default. Through the annotation of Chicory CLI, we define a Java class called HelloCommand to indicate this command.In the RUN method, we print the corresponding greetings according to the input parameters.In the main method, we use the Chicory CLI command to analyze and execute the functional analysis parameters and execute the command. To compile and run this example program, you need to add the relevant dependencies and configuration files of the Chicory Cli.These dependent libraries and configuration files can be downloaded from the official CLI website and refer to the official documentation. Through the Chicory CLI framework, we can easily add a command line interface to the Java application to provide more convenient and flexible operation methods.Regardless of the creation of command line tools, custom script interpreters, or command line testing, Chicory CLI is a powerful and practical tool.