Question

我正在测试Groovy，但我无法弄清楚如何正确调用GroovyScriptEngine。它会在下面产生错误。

org.codehaus.groovy.runtime.metaclass.MissingMethodExceptionNoStack

Song.Groovy

class Song {

 def args;
{ 
  println "Song has been called." + args;
 }



 String getArtist(){    
    return "sdfsdf";
 }

 public String toString(){
    return "Hey!";
 }

 }

Java Main - ＆gt;

String[] paths = { "C:\\Users\\User\\workspace\\GroovyTest\\src\\groovy" };

        GroovyScriptEngine gse = new GroovyScriptEngine(paths);
        Binding binding = new Binding();
        Object s = "Default...";

        binding.setVariable("args", s);

        gse.run("Song.groovy", binding);

args变量也会产生null ..

怎么办？

Answer 1

你正在上课！

如果你想测试你的课程，请在Song.groovy的最后尝试这样的事情：

// Instantiate an object of your class and use some methods!
def song = new Song()
println song.getArtist();

运行时

gse.run("Song.groovy", binding);

你基本上正在加载你的课程，但你没有做任何事情。

请参阅此示例here

Answer 2

（代表OP发布）：

工作代码：

<强> Test1.java

import groovy.lang.Binding;
import groovy.util.GroovyScriptEngine;

public class Test1 {

    public static void main(String[] args) throws Exception {
        String[] paths = { "C:\\Users\\User\\workspace\\GroovyTest\\src\\groovy" };

        GroovyScriptEngine gse = new GroovyScriptEngine(paths);
        Binding binding = new Binding();

        binding.setVariable("args", "Test Data");

        String result = (String) gse.run("File1.groovy", binding);
        System.out.println("Groovy Result: "  + result);

    }

}

<强> File1.groovy

package groovy;

class Greeter {
    String sayHello(String data) {
        def greet = data;
        return greet
    }
}

 static void main(String[] args) { 
        def greeter = new Greeter()
        return greeter.sayHello(args);
   }

如何正确调用GroovyScriptEngine？

2 个答案: