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python库介绍-pyjnius：访问java类

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。

参考资料：

  • python中文库参考项目： https://bitbucket.org/china-testing/python-chinese-library

  • python中文库参考项目文档：https://bitbucket.org/china-testing/python-chinese-library/wiki/browse/

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接口自动化性能测试数据分析人工智能从业专家一对一线上培训大纲

  • 文档：http://pyjnius.readthedocs.io/en/latest/installation.html

  • 下载地址：https://pypi.python.org/pypi?%3Aaction=search&term=jnius&submit=search

注意jnius的版本管理有点混乱，目前看来选择jniusx比较好。

  • git地址：https://github.com/kivy/pyjnius/blob/master/docs/source/index.rst

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：

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#!/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：

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#!/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

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#!/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

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# 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：

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# 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 IPython's features.
%quickref -> Quick reference.
help      -> Python's 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：

# -*- 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。

参考资料

  • http://pyjnius.readthedocs.io/en/latest/
  • http://nullege.com/codes/show/src@l@o@LODGrefine-HEAD@lod2-google-refine@extensions@jython@module@MOD-INF@lib@jython@os.py/1161/java.security.SecureRandom