一.准备

首先我们要准备好以下东西:

  1. java运行环境
  2. python运行环境
  3. Maven中添加下面的内容

<!-- https://mvnrepository.com/artifact/org.python/jython -->
        <dependency>
            <groupId>org.python</groupId>
            <artifactId>jython</artifactId>
            <version>2.7.1b3</version>
        </dependency>


二.思路

程序都有三个部分:输入,执行操作,输出,所以对于java来说,它需要向一个Python程序输入必要值,然后接收python程序运行的结果就好了.


三.案例

我们举最简单的1+1的例子

Python需要执行的操作类 MyPython.py:


def add_two(a, b):
    return a + b

java操作类 Main.java: 


package jython_test;

import org.python.core.PyClass;
import org.python.core.PyFunction;
import org.python.core.PyInteger;
import org.python.core.PyObject;
import org.python.util.PythonInterpreter;

import java.util.Properties;

public class Main {

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("python.home", "D:\\Python\\Python36\\Lib");//python的Lib库的位置
        props.put("python.console.encoding", "UTF-8");
        props.put("python.security.respectJavaAccessibility", "false");
        props.put("python.import.site", "false");//注意:如果没有这一条会有Exception in thread "main" ImportError: Cannot import site module and its dependencies: No module named site报错
        Properties preprops = System.getProperties();
        PythonInterpreter.initialize(preprops, props, new String[0]);
        //python解释器
        PythonInterpreter interpreter = new PythonInterpreter();
        interpreter.execfile("D:\\MyPython.py");//python文件路径
        PyFunction function = interpreter.get("add_two", PyFunction.class);//这样得到了指定的函数
        PyObject pyobj = function.__call__(new PyInteger(1), new PyInteger(1));//给函数传入参数,这里不会有代码提示,所以要保证参数类型与数量正确,否则会报错
        System.out.println(pyobj.toString());
    }
}