详解java调用python的几种用法(看这篇就够了)

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

package com.test;

import org.python.util.PythonInterpreter;

public class JavaRunPython {
  
  public static void main(String[] args) {
    PythonInterpreter interpreter = new PythonInterpreter();
    interpreter.exec("a='hello world'; ");
    interpreter.exec("print a;");
  }

}

a = 1
b = 2
print (a + b)

package com.test;

import org.python.util.PythonInterpreter;

public class JavaPythonFile {

  public static void main(String[] args) {
    PythonInterpreter interpreter = new PythonInterpreter();
    interpreter.execfile("D:\\javaPythonFile.py");
  }
}

print('RuntimeDemo')

package com.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

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

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

package com.test;

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

public class Function {
  
  public static void main(String[] args) {
    PythonInterpreter interpreter = new PythonInterpreter();
    interpreter.execfile("D:\\add.py");
        
    // 第一个参数为期望获得的函数（变量）的名字，第二个参数为期望返回的对象类型
    PyFunction pyFunction = interpreter.get("add", PyFunction.class);
    int a = 5, b = 10;
    //调用函数，如果函数需要参数，在Java中必须先将参数转化为对应的“Python类型”
    PyObject pyobj = pyFunction.__call__(new PyInteger(a), new PyInteger(b)); 
    System.out.println("the anwser is: " + pyobj);
  }

}