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pyjnius:访问java类

时间:2020-07-28 00:17:56      阅读:83      评论:0      收藏:0      [点我收藏+]

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简介

Pyjnius是一个用于访问Java类的Python库。

适用场景:极个别的加密算法等内容,用python不方便实现或者实现较耗时,可基于Pyjnius把java类当做python库使用。

注意jnius的版本管理有点混乱,目前看来选择jniusx比较好。

安装

先安装Java JDK 和JRE、Cython

# pip3 install cython

# pip3 install jniusx

Collecting jniusx

  Downloading jniusx-1.0.5.tar.gz

Requirement already satisfied: six>=1.7.0 in /opt/python3.5/lib/python3.5/site-packages (from jniusx)

Requirement already satisfied: cython in /opt/python3.5/lib/python3.5/site-packages (from jniusx)

Installing collected packages: jniusx

  Running setup.py install for jniusx ... done

Successfully installed jniusx-1.0.5

注意:jnius安装的坑比较多,请参考http://stackoverflow.com/search?q=jnius

如果出现ImportError,一般是java环境变量或者path没有配置好。

jnius/jnius.c:4:20: fatal error: Python.h 一般为缺python-dev, yum -y install python-devel

pip 安装不成功可以尝试 setup.py方式。

jnius/jnius.c: No such file or directory 需要利用原来保存的clone。

快速入门

hello world 实例:

#!/usr/bin/env python

# -*- coding: utf-8 -*-

# jnius_quick2.py

# Author Rongzhong Xu 2016-08-02 wechat: pythontesting

# https://bitbucket.org/china-testing/python-chinese-library/src

"""

jnius demo

Tested in python2.7 

"""

from jnius import autoclass

System = autoclass(java.lang.System)

System.out.println(Hello World)

堆栈实例:

#!/usr/bin/env python

# -*- coding: utf-8 -*-

# jnius_quick1.py

# Author Rongzhong Xu 2016-08-02 wechat: pythontesting

# https://bitbucket.org/china-testing/python-chinese-library/src

"""

jnius demo

Tested in python2.7 

"""

from jnius import autoclass

Stack = autoclass(java.util.Stack)

stack = Stack()

stack.push(hello)

stack.push(world)

print(stack.pop())  # --> ‘world‘

print(stack.pop())  # --> ‘hello‘

调用java String的hashCode

#!/usr/bin/env python

# -*- coding: utf-8 -*-

# jnius_quick3.py

# Author Rongzhong Xu 2016-08-02 wechat: pythontesting

# https://bitbucket.org/china-testing/python-chinese-library/src

"""

jnius demo: Call java String‘s hashCode

Tested in python2.7 

"""

from jnius import autoclass

String = autoclass(java.lang.String)

print(String("hello").hashCode())

调用jar包

#!python

# vi com/sample/Beach.java 

package com.sample;

public class Beach {

    private String name;

    private String city;

    public Beach(String name, String city){

        this.name = name;

        this.city = city;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getCity() {

        return city;

    }

    public void setCity(String city) {

        this.city = city;

    }

}

# echo Main-Class: Beach >manifest.txt

# jar cvfm Test.jar manifest.txt com/sample/*.class

测试:

#!python

# ipython

Python 3.5.2 (default, Nov  7 2016, 18:53:51) 

Type "copyright", "credits" or "license" for more information.

IPython 5.1.0 -- An enhanced Interactive Python.

?        -> Introduction and overview of IPythons features.

%quickref -> Quick reference.

help      -> Pythons own help system.

object?  -> Details about object, use object?? for extra details.

In [2]: # 注意要先把jar加载CLASSPATH环境变量。

In [3]: from jnius import autoclass

In [4]: Bla = autoclass(com.sample.Beach)

In [5]: s = Bla("Tom", "Shenzhen")

In [6]: s.getName()

Out[6]: Tom

```

封装某模块的加密机制为python包实例:

* 拷贝: com cn org 到新建的临时目录

* echo Main-Class: AESUtil >manifest.txt

* jar cvfm Test.jar manifest.txt *

测试代码:

```python

# -*- coding: utf-8 -*-

# 注意要先把jar加载CLASSPATH环境变量。

from jnius import autoclass

AESUtil = autoclass(com.oppo.sso.util.AESUtil)

email = AESUtil.aesEncrypt("hello@126.com","我是一个加密密钥")

print(email)

注意:以上打包方式和具体环境很相关,建议尽量本机打包,本机执行。

pyjnius:访问java类

标签:http   amp   evel   代码   test   sys   pytho   target   erro   

原文地址:https://www.cnblogs.com/tracydzf/p/13387900.html

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