簡介

Pyjnius是一個用於訪問Java類的Python庫。

適用場景：極個別的加密演算法等內容，用python不方便實現或者實現較耗時，可基於Pyjnius把java類當做python庫使用。

文件：http://pyjnius.readthedocs.io/en/latest/installation.html

下載地址：https://pypi.python.org/pypi?%3Aaction=search&term=jnius&submit=search

注意jnius的版本管理有點混亂，目前看來選擇jniusx比較好。

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

安裝

先安裝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/python
3.5 / lib / python3.5 / site - packages(
	from jniusx)
Requirement already satisfied: cython in
	/opt/python
3.5 / 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安裝的坑比較多，請參考http://stackoverflow.com/search?q=jnius

如果出現ImportError，一般是java環境變數或者path沒有配置好。

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

pip 安裝不成功可以嘗試　setup.py方式。

jnius/jnius.c: No such file or directory 需要利用原來儲存的clone。

快速入門

hello world 例項：

#!/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')

堆疊例項：

#!/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'

呼叫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())

呼叫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*/

測試：

#!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載入CLASSPATH環境變數。
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'
``
`

封裝某模組的加密機制為python包例項：

* 拷貝： com cn org 到新建的臨時目錄

* echo Main-Class: AESUtil >manifest.txt

* jar cvfm Test.jar manifest.txt *

測試程式碼：

`
``
python
# - * -coding: utf - 8 - * -
	#注意要先把jar載入CLASSPATH環境變數。
from jnius
import autoclass
AESUtil = autoclass(
	'com.oppo.sso.util.AESUtil')
email = AESUtil.aesEncrypt(
	"[email protected]","我是一個加密金鑰")
print(email)# !python
# ipython
Python 3.5.2(
	default,"我是一個加密金鑰")
print(email)

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。