使用来自 Groovy 的 jCommander 解析命令行（示例代码失败）

Question

我正在尝试使用 jCommander 来解析 Groovy 中的命令行参数。

(MacBook (El Capitan), Groovy 2.4.11, jCommander-1.49 )

jCommander.org 上提供的示例（参见 http://jcommander.org/#_groovy）为：

import com.beust.jcommander.Parameter;

public class Args {
  @Parameter
  private List<String> parameters = new ArrayList<>();

  @Parameter(names = { "-log", "-verbose" }, description = "Level of verbosity")
  private Integer verbose = 1;

  @Parameter(names = "-groups", description = "Comma-separated list of group names to be run")
  private String groups;

  @Parameter(names = "-debug", description = "Debug mode")
  private boolean debug = false;
}

但是当我尝试运行该代码时 (groovy jCommanderSample.groovy) 我得到：

lexu@mbp:~/.../Groovy/CliParameters $ groovy jCommanderSample.groovy
Caught: groovy.lang.MissingMethodException: No signature of method: static com.beust.jcommander.JCommander.newBuilder() is applicable for argument types: () values: []
groovy.lang.MissingMethodException: No signature of method: static com.beust.jcommander.JCommander.newBuilder() is applicable for argument types: () values: []
    at jCommanderSample$_run_closure1.doCall(jCommanderSample.groovy:9)
    at jCommanderSample.run(jCommanderSample.groovy:8)

我错过了什么？

Answer 1

您可能注意到 groovy 中的列表定义有所不同。在java中，使用了{ ..}。在 groovy 中如下：

def list = [1, 2]

更改自：

@Parameter(names = { "-log", "-verbose" }, description = "Level of verbosity")

收件人：

@Parameter(names = ["-log", "-verbose" ] , description = "Level of verbosity")

Answer 2

这是我复制到我的代码片段集合中的解决方案：

示例 Groovy jCommander 脚本

#!/usr/bin/env groovy
import com.beust.jcommander.*
class Simple {
  static class Args {
    @Parameter
    private List<String> aParamList = [];
    @Parameter(names = [ "--quiet", "-q" ], description = "quiet mode, no output to STDOUT")
    private Boolean aQuiet = false;

    @Parameter(names = [ "--logging", "-l" ], description = "logging verbosity (0-4)")
    private Integer aLogLevel = 1;

    @Parameter(names = [ "--group", "-g" ], description = "group name, default is 'none'")
    private String aGroupName = 'none';
  }

  public static main(String[] pArgs) {
    Boolean vQuiet    ;
    Integer vLogLevel ;
    String vGroupName ;
    List<String> vParamList;
    new Args().with {
      try {
        new JCommander(it, pArgs)
        vQuiet     = it.aQuiet;
        vLogLevel  = it.aLogLevel;
        vGroupName = it.aGroupName;
        vParamList = it.aParamList;
      }
      catch(com.beust.jcommander.ParameterException e) {
        println "Fatal Error parsing arguments:  $e.message"
        System.exit(-1)
      }
    }
    println "unbound parameters: " + vParamList;
    println "          LogLevel: $vLogLevel";
    println "       Silent Mode: $vQuiet";
    println "         GroupName: $vGroupName";
  }
}

使用来自 Groovy 的 jCommander 解析命令行（示例代码失败）

Parsing command line with jCommander from Groovy (sample code fails)

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