1.why

python擁有的某些庫要比Java強大，也擁有一些比Java更擅長的領域，python可以搭建后端讓Java調用接口，但某些時候我們用到的python代碼可能并不多也許只有一個算法，此時就需要以下方法了。

2.核心依賴

毫無疑問【自然是python的Java執行器了】

<dependency><groupId>org.python</groupId><artifactId>jython-standalone</artifactId><version>2.7.0</version> </dependency>

3.使用

3.1類型一【直接執行python代碼】

public class ExecPythonCode {public static void main(String[] args) {PythonInterpreter interpreter = new PythonInterpreter();interpreter.exec("a=[5,2,3,9,4,0];");// 此處python語句是3.x版本的語法interpreter.exec("print(sorted(a));"); // 此處是python語句是2.x版本的語法interpreter.exec("print sorted(a);"); interpreter.close();} }

3.2類型二【執行python文件后獲取返回結果】

無參數的python文件執行

public class ExecPythonFile {public static void main(String[] args) {try {Process process = Runtime.getRuntime().exec("python D:\\PythonFile.py");BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));String line = null;while ((line = in.readLine()) != null) {System.out.println(line);}in.close();process.waitFor();} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}} }

帶參數的python文件執行

public class ExecPythonFileWithArgs {public static void main(String[] args) {int a = 18, b = 19;args = new String[] { "python","D:\\PythonFileWithArgs.py",String.valueOf(a), String.valueOf(b) };try {Process process = Runtime.getRuntime().exec(args);BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));String line = null;while ((line = in.readLine()) != null) {System.out.println(line);}in.close();process.waitFor();} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}} }

【Windows環境】使用bat腳本執行python文件【我猜想也是有Linux環境的執行方法的】

public class ExecPythonBat {public static void main(String[] args) {try {Process process = Runtime.getRuntime().exec("cmd /c D:\\RunPythonFile.bat");BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));String line = null;while ((line = in.readLine()) != null) {System.out.println(line);}in.close();process.waitFor();} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}} }

3.3類型三【讀取python文件內的函數進行執行】

public class ExecPythonFileCode {public static void main(String[] args) {PythonInterpreter interpreter = new PythonInterpreter();interpreter.execfile("D:\\PythonFile.py");PyFunction function = interpreter.get("add", PyFunction.class);int a = 3, b = 12;PyObject pyObject = function.__call__(new PyInteger(a), new PyInteger(b));System.out.println("The result is : " + pyObject);interpreter.close();} }

4.python文件和執行腳本

文件一：PythonFile.py

import numpy as np a = np.arange(12).reshape(3,4) print(a) def add(a,b):return a+b;

文件二：PythonFileWithArgs.py

import sysdef func(a,b):return (a+b)if __name__ == '__main__':a = []for i in range(1, len(sys.argv)):a.append((int(sys.argv[i])))print(func(a[0],a[1]))

文件三：RunPythonFile.bat

@echo off cmd /k python E:\Anaconda3_Python\PythonFile.py 與50位技術專家面對面20年技術見證，附贈技術全景圖

總結

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