使用Jpython调用跑一python

最新推荐文章于 2022-05-27 15:56:00 发布

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最新推荐文章于 2022-05-27 15:56:00 发布

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分类专栏： Java 文章标签： java

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本文介绍了如何在Java程序中使用Jython库来执行Python语句和Python脚本中的函数。首先，通过Maven引入Jython依赖，然后创建PythonInterpreter实例执行Python表达式。接着，展示了如何执行Python脚本并调用其中的函数，实现Java和Python的交互。

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1、添加maven依赖

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

2、在Java中执行python语句

import javax.script.*;
import org.python.util.PythonInterpreter;
import java.io.*;
import static java.lang.System.*;
public class FirstJavaScript
{
public static void main(String args[])
{
PythonInterpreter interpreter = new PythonInterpreter();
interpreter.exec("days=('mod','Tue','Wed','Thu','Fri','Sat','Sun'); ");
interpreter.exec("print days[1];");
}//main
}

2、在Java中执行Python脚本中的函数

新建python脚本complex.py

import addition

def complex(a,b):
    print(addition.add(a,b))
    print(addition.sub(a,b))
    print(addition.multi(a,b))
    print(addition.div(a,b))

a = int(input("input a:"))
b = int(input("input b:"))
complex(a,b)

新建Python脚本addition.py

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

def sub(a,b):
    return a-b

def multi(a,b):
    return a*b

def div(a,b):
    return a/b

Java类代码

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

import java.io.IOException;
import java.util.Properties;

/**
 * Created by zhangmingbo on 3/20/17.
 */
public class PythonDemo {

    public static void main(String[] args) throws IOException {

        //Create interpreter
        Properties props = new Properties();
        props.put("python.home", "path to the Lib folder");
        props.put("python.console.encoding", "UTF-8"); // Used to prevent: console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0.
        props.put("python.security.respectJavaAccessibility", "false"); //don't respect java accessibility, so that we can access protected members on subclasses
        props.put("python.import.site", "false");

        Properties preprops = System.getProperties();
        PythonInterpreter.initialize(preprops, props, new String[0]);

        PythonInterpreter interp = new PythonInterpreter();

        interp.exec("import sys");
//        interp.exec("sys.path.append('D:/Program Files (x86)/jython2.7.0/Lib')");//jython自己的
//        interp.exec("sys.path.append('D:/Program Files (x86)/jython2.7.0/Lib/site-packages')");//jython自己的
        interp.exec("sys.path.append('C:/Users/xuhao/Loquat')");//我们自己写的

        interp.execfile("complex.py");
        PyFunction func = (PyFunction)interp.get("complex",PyFunction.class);
        int a = 2010, b = 2 ;
        PyObject pyobj = func.__call__(new PyInteger(a), new PyInteger(b));
        System.out.println("anwser = " + pyobj.toString());
    }
}

3、使用Java执行python脚本

建立python脚本input.py

print 'hello'  
number=[3,5,2,0,6]  
print number  
number.sort()  
print number  
number.append(0)  
print number  
print number.count(0)  
print number.index(5)

调用的Java类

import javax.script.*;  
  
import org.python.core.PyFunction;  
import org.python.core.PyInteger;  
import org.python.core.PyObject;  
import org.python.util.PythonInterpreter;  
  
import java.io.*;  
import static java.lang.System.*;  
public class FirstJavaScript  
{  
 public static void main(String args[])  
 {  
    
  PythonInterpreter interpreter = new PythonInterpreter();  
  interpreter.execfile("C:\\Python27\\programs\\input.py");  
 }//main  
}