如何将参数传递给jshell脚本? [英] How to pass arguments to a jshell script?

问题描述

我愿意将参数传递给jshell脚本.例如，我会喜欢这样的东西:

I am willing to pass arguments to a jshell script. For instance, I would have liked something like this:

jshell myscript.jsh "some text"

，然后在脚本中的某些变量中提供字符串"some text".

and then to have the string "some text" available in some variable inside the script.

但是，jshell只需要一个文件列表，因此答案是:

However, jshell only expects a list of files, therefore the answer is:

File 'some text' for 'jshell' is not found.

有什么方法可以正确地将参数传递给jshell脚本吗?

Is there any way to properly pass arguments to a jshell script?

到目前为止，我唯一的解决方案是在调用脚本时使用环境变量:

My only solution so far is to use an environment variable when calling the script:

ARG="some test" jshell myscript.jsh

然后我可以使用以下脚本在脚本中访问它:

And then I can access it in the script with:

System.getenv().get("ARG")

推荐答案

选项-R

> jshell -v -R-Da=b ./file.jsh

用于脚本

{
  String value = System.getProperty("a");
  System.out.println("a="+value);
}
/exit

会给你

> jshell -v -R-Da=b ./file.jsh
a=b

另一种方式是:

{
  class A {
    public void main(String args[])
    {
        for(String arg : args) {
          System.out.println(arg);
        }
    }
  }

  new A().main(System.getProperty("args").split(" "));
}

和执行

> jshell -R-Dargs="aaa bbb ccc" ./file_2.jsh

更新

Update

先前的解决方案将因更复杂的参数而失败.例如. 'This is my arg'.

Previous solution will fail with more complex args. E.g. 'This is my arg'.

但是我们可以从ant中受益，它是CommandLine类

But we can benefit from ant and it's CommandLine class

import org.apache.tools.ant.types.Commandline;
{
  class A {
    public void main(String args[])
    {
      for(String arg : args) {
        System.out.println(arg);
      }
    }
  }

  new A().main(Commandline.translateCommandline(System.getProperty("args")));
}

然后，我们可以这样称呼它:

and then, we can call it like this:

jshell --class-path ./ant.jar -R-Dargs="aaa 'Some args with spaces' bbb ccc" ./file_2.jsh
aaa
Some args with spaces
bbb
ccc

当然，ant.jar必须位于通过--class-path

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