如何从groovy返回值到java [英] how to return value from groovy to java

问题描述

我有一个绑定到运行groovy脚本的servlet的jsp页面。我可以从servlet中获得groovy脚本。但是在脚本运行后，我该如何将groovy脚本的响应返回给servlet以显示在jsp页面中？

I have a jsp page tied to a servlet that runs groovy scripts. I am able to get to the groovy script from the servlet. But after the script runs how do I return the response from the groovy script back to the servlet to be displayed in the jsp page?

我的java servlet代码如下所示：

My java servlet code is as follows:

File file = new File("TestScript.groovy");      
ClassLoader parent = getClass().getClassLoader();
GroovyClassLoader loader = new GroovyClassLoader(parent);
Class groovyClass = loader.parseClass(file);
Object[] args = {};
GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();
groovyObject.invokeMethod("runTest", args);

更新：

groovyscriptengine和grovyshell，但试图运行这些时，我得到以下异常：
org.codehaus.groovy.runtime.metaclass.MissingMethodExceptionNoStack：没有方法的签名：
runTest

Update:

I also looked into groovyscriptengine and grovyshell but when trying to run those i get the following exception: org.codehaus.groovy.runtime.metaclass.MissingMethodExceptionNoStack: No signature of method: runTest

这是我在我的测试脚本中所具有的。

This what i have in my test script. Maybe I am not returning it properly.

class TestScript
{
 @Test
 public String runTest()
 {
  //run test
  return response
 }
}

推荐答案

使 runTest groovy方法返回您想传递给servlet的值，并将其作为 groovyObject.invokeMethod 的返回值捕获：

Have the runTest groovy method return the value you want to pass to the servlet, and capture it as the return value of groovyObject.invokeMethod :

Object ret = groovyObject.invokeMethod("runTest", args1);
System.out.println("In Java " + ret);

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