本文介绍了通过脚本引擎(jython)从Java调用Python?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试使用 javax.script
从Java 6应用程序调用Jython:
I'm trying to call Jython from a Java 6 application using javax.script
:
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class jythonEx
{
public static void main (String args[]) throws ScriptException
{
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine pyEngine = mgr.getEngineByName("python");
try {
pyEngine.eval("print \"Python - Hello, world!\"");
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
这导致NullPointerException:
This is causing a NullPointerException:
java.lang.NullPointerException
at jythonEx.main(jythonEx.java:12)
有没有人知道我在这里做错了什么?
Does anyone have any idea what I'm doing wrong here?
编辑:
感谢您的回复!我将jython.jar添加到类路径中并且运行正常:
Thanks for the responses! I added jython.jar to the classpath and it runs properly:
java -cp "./;jython.jar" jythonEx
推荐答案
您必须先注册您的引擎。
You have to register your engine first.
来自::
用户指南说你必须:
编辑
关于你的评论:我认为你应该开一个新问题,你会得到更好的答案。
EDITAbout your comment: I think you should open a new question, you'll get better answers.
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