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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 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)看完上述内容，是不是对Python基于pyjnius库实现访问java类的方法有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。
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