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Python基于pyjnius库实现访问java类

2020年07月31日 作者：Tracydzf原文

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。

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/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)# !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)

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持来客网。

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