picocli

构建 Java 命令行应用的框架。简单易用寥寥几行代码，就可以完成一个 Java 命令行应用程序。虽然由 Java 编写但可以在 Groovy、Kotlin、Scala 中使用，支持命令自动补全、颜色、子命令、帮助信息等功能。

java import picocli.CommandLine;import picocli.CommandLine.Option;import picocli.CommandLine.Parameters;import java.io.File;@Command(name = "example", mixinStandardHelpOptions = true, version = "Picocli example 4.0")public class Example implements Runnable {@Option(names = { "-v", "--verbose" },description = "Verbose mode. Helpful for troubleshooting. Multiple -v options increase the verbosity.")private boolean[] verbose = new boolean[0];@Parameters(arity = "1..*", paramLabel = "FILE", description = "File(s) to process.")private File[] inputFiles;public void run() {if (verbose.length > 0) {System.out.println(inputFiles.length + " files to process...");}if (verbose.length > 1) {for (File f : inputFiles) {System.out.println(f.getAbsolutePath());}}}public static void main(String[] args) {// By implementing Runnable or Callable, parsing, error handling and handling user// requests for usage help or version help can be done with one line of code.int exitCode = new CommandLine(new Example()).execute(args);System.exit(exitCode);}}