如何从java类调用python方法？ [英] How to call a python method from a java class?

问题描述

我在Java项目中使用Jython。

I am using Jython within a Java project.

我有一个Java类： myJavaClass.java 和一个Python类： myPythonClass.py

I have one Java class: myJavaClass.java and one Python class: myPythonClass.py

public class myJavaClass{
    public String myMethod() {
        PythonInterpreter interpreter = new PythonInterpreter();
        //Code to write
    }
 }

Python文件如下：

The Python file is as follows:

class myPythonClass:
    def abc(self):
        print "calling abc"
        tmpb = {}
        tmpb = {'status' : 'SUCCESS'}
        return tmpb

现在的问题是我想从 myMethod中调用我的Python文件的 abc（）方法我的Java文件的方法并打印结果。

Now the problem is I want to call the abc() method of my Python file from the myMethod method of my Java file and print the result.

推荐答案

如果我读文档，你可以使用 eval function：

If I read the docs right, you can just use the eval function:

interpreter.execfile("/path/to/python_file.py");
PyDictionary result = interpreter.eval("myPythonClass().abc()");

或者如果你想得到一个字符串：

Or if you want to get a string:

PyObject str = interpreter.eval("repr(myPythonClass().abc())");
System.out.println(str.toString());

如果你想从Java变量中提供一些输入，你可以使用事先设置，然后在Python代码中使用该变量名：

If you want to supply it with some input from Java variables, you can use set beforehand and than use that variable name within your Python code:

interpreter.set("myvariable", Integer(21));
PyObject answer = interpreter.eval("'the answer is: %s' % (2*myvariable)");
System.out.println(answer.toString());

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