这篇文章主要讲解了Python基于pyjnius库实现访问java类的方法，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

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。

安装

先安装Java JDK 和JRE、Cython

#pip3 install cython# pip3 install jniusxCollecting jniusxDownloading jniusx - 1.0.5. tar.gzRequirement 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: jniusxRunning setup.py installfor jniusx...doneSuccessfully 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 demoTested in python2.7"""from jniusimport autoclassSystem = 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 demoTested in python2.7"""from jniusimport autoclassStack = 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 hashCodeTested in python2.7"""from jniusimport autoclassString = autoclass('java.lang.String')print(String("hello").hashCode())

调用jar包

#!python#vi com / sample / Beach.javapackage 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#ipythonPython 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 jniusimport autoclassIn[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 jniusimport autoclassAESUtil = autoclass('com.oppo.sso.util.AESUtil')email = AESUtil.aesEncrypt("hello@126.com", "我是一个加密密钥")print(email)# !python# ipythonPython 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 jniusimport autoclassIn[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 jniusimport autoclassAESUtil = autoclass('com.oppo.sso.util.AESUtil')email = AESUtil.aesEncrypt("hello@126.com", "我是一个加密密钥")print(email)

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