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