在Python中实际使用Java类/ JAR？ [英] Practical use of Java class/JAR in Python?

问题描述

我花了很多时间寻找这个并探索了很多解决方案。

I spent significant amount of time looking for this and explore many solutions.

这与这个线程有关。
从Python调用Java

This is related to this thread. Calling Java from Python

最后，经过测试：

Pyjnius：无法在Windows中安装。

Pyjnius : Cannot install in Windows.

Py4J：可以在Windows上安装，但使用Gateway有点重。

Py4J: can install on windows, but using Gateway is a bit heavy.

JPype： Python 3安装在5分钟后，可以加载50Mo JAR而不会出现任何问题。
好​​的是语法与Python语法完全合并...
https： //github.com/tcalmant/jpype-py3

JPype: Python 3 installed in 5 mins, can load 50Mo JAR without any issues. Good thing is the syntax is completely merged with Python syntax... https://github.com/tcalmant/jpype-py3

只是想知道，如果有人在Python中开发了真实的Java包装应用程序（即运行在大型JAR的生产服务器？

Just Wondering, if any people has developed real world wrapping application of Java in Python (ie running on a production server) with big size JAR ?

推荐答案

为了节省许多人的时间，我发布了用于JPype的模块，这正在加载JAR。

To save time to many people, I post the module I used for JPype, this is working nicel to load JAR.

import jpype as jp; import numpy as np; import os as os
jarpath= r"D:\zjavajar\\"
mavenurl= r"http://mvnrepository.com/artifact/"



# StartJVM (add "-Xmx" option with 1024M if crash due to not enough memory )
def importJAR(path1="", path2="", path3="", path4=""):
   classpath = path1
   if path2 != "":  classpath = os.pathsep.join((classpath, path2))   
   if path3 != "":  classpath = os.pathsep.join((classpath, path3))
   if path4 != "":  classpath = os.pathsep.join((classpath, path4))        
   jp.startJVM(jp.getJVMPath(),"-ea", "-Djava.class.path=%s" % classpath)


def showLoadedClass(): #Code to see the JAR loaded.
   classloader = jp.java.lang.ClassLoader.getSystemClassLoader(); vv= []; 
   for x in classloader.getURLs():  vv.append(x.toString());         
   return vv


def loadSingleton(class1):  single= jp.JClass(class1);  return Single.getInstance()


def java_print(x):  jp.java.lang.System.out.println(x)   #Print in Java Console

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