java jython 调用,JavaDemo——Java通过Jython调用py脚本

maven导入：

org.python

jython-standalone

2.7.2

准备python文件test2.py：

#!/usr/bin/env python3

# coding=utf-8

xyz='hello python'

abc=1234

class Result:

s = ''

r = 0.0

def __init__(self, s, r):

self.s = s

self.r = r

def func_cls(x, y):

print('py fun=x^2+2xy+y^2')

print('x={0}, y={1}'.format(x, y))

return Result('pyResult', eval('x**2 + 2*x*y + y**2'))

def func_str():

return 'func2 return str'

def func_list():

return [11, 22, 33]

def func_dict():

return {1:'a', 2:'b', 3:'c'}

#没有变量newstr

def func_nostr():

return newstr

if __name__ == '__main__':

print('py main run')

# func_nostr()#NameError: name 'newstr' is not defined

调用demo：

/**

* 2020年7月6日上午10:16:29

*/

package testcallpython;

import org.python.core.PyDictionary;

import org.python.core.PyFloat;

import org.python.core.PyFunction;

import org.python.core.PyList;

import org.python.core.PyObject;

import org.python.core.PyString;

import org.python.util.PythonInterpreter;

/**

* @author XWF

*

*/

public class TestCallPython_Jython {

/**

* @param args

*/

public static void main(String[] args) {

PythonInterpreter interpreter = new PythonInterpreter();

//执行python语句

interpreter.exec("print('start test')");

interpreter.exec("print('='*50)");

//加载并运行python文件

interpreter.execfile("src/testcallpython/test2.py");

interpreter.exec("print('='*50)");

//调用py文件里的属性

PyObject xyzobj = interpreter.get("xyz");

System.out.println("xyz=" + xyzobj);

PyObject abcobj = interpreter.get("abc");

System.out.println("abc=" + abcobj);

interpreter.set("newstr", "newString");//手动添加newstr变量

System.out.println("newstr=" + interpreter.get("newstr"));

interpreter.exec("print('='*50)");

//调用py文件里的方法

PyFunction funcCls = interpreter.get("func_cls", PyFunction.class);

PyObject returnPyobj = funcCls.__call__(new PyFloat(2), new PyFloat(3));

System.out.println("结果:" + returnPyobj.toString());

System.out.println("class=" + returnPyobj.getClass());

System.out.println("s=" + returnPyobj.__findattr__("s"));

System.out.println("r=" + returnPyobj.__findattr__("r"));

System.out.println("ss=" + returnPyobj.__findattr__("ss"));

//System.out.println(returnPyobj.__getattr__("ss"));//Exception in thread "main" AttributeError: Result instance has no attribute 'ss'

interpreter.exec("print('='*50)");

PyFunction funStr = interpreter.get("func_str", PyFunction.class);

System.out.println(funStr.__call__().__tojava__(PyString.class));

System.out.println(funStr.__call__());

PyFunction funList = interpreter.get("func_list", PyFunction.class);

PyList list = (PyList) funList.__call__().__tojava__(PyList.class);

System.out.println(list);

System.out.println(list.get(2));

PyFunction funDict = interpreter.get("func_dict", PyFunction.class);

PyDictionary dict = (PyDictionary) funDict.__call__().__tojava__(PyDictionary.class);

System.out.println(dict);

System.out.println(dict.get(2));

PyFunction funcNostr = interpreter.get("func_nostr", PyFunction.class);

System.out.println(funcNostr.__call__());//手动添加newstr后可以正常调用

}

}

结果：

有趣的是可以通过jython添加py里未定义的属性消除异常；