更新时间:2022-09-16 15:57:00
本篇主要讲解如何将可复用的功能作成独立的App,并从主Project中分离出来,便于以后加入到任意Project中。
下面以一个简单的例子来说明如何物理上分离各个可复用的App
首先建立一个django project,名为siteWithApps。建立方法参见Django使用心得(一)
然后建立3个子工程:(3个子工程没有实际的功能,只是模拟如何在django中分离App)
subApp1: 模拟权限认证功能,认证成功后返回siteWithApps
subApp2: 无实际功能,可返回siteWithApps
subApp3: 无实际功能,可返回siteWithApps
3个子App的建立也非常简单,只需建立一个文件夹,然后在文件夹中新建3个空文件,文件名分别为__init__.py,urls.py,views.py,本次不涉及数据库,所以没有建立models.py。
注意,这里为了从物理上也分离这3个App,将这3个App放在与siteWithApps不同文件夹中了。整个工程的文件夹结构请参照本文最后的部分。
3个子App分别独立实现,与主Project没有任何联系,方便移植到其他Project中复用。
代码如下:
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# subApp1: # file : views.py #!/usr/bin/env python # -*- coding: utf-8 -*- from django.shortcuts import render_to_response
def Login( request ):
name = request.POST.get( 'user_name' , '' )
pwd = request.POST.get( 'user_pass' , '' )
result = False
if name = = 'admin' and pwd = = '123' :
result = True
return render_to_response( 'subApp1/check_login.html' ,
{ 'user_name' : name,
'user_pass' : pwd,
'result' : result
})
# file : urls.py from django.conf.urls.defaults import *
urlpatterns = patterns('',
(r '^$' , 'subApp1.views.Login' ),
) |
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# subApp2: # file: views.py #!/usr/bin/env python # -*- coding: utf-8 -*- from django.shortcuts import render_to_response
def App( request ):
return render_to_response( 'subApp2/subApp2.html' )
# file: urls.py from django.conf.urls.defaults import *
urlpatterns = patterns('',
(r '^$' , 'subApp2.views.App' ),
) |
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# subApp3: # file: views.py #!/usr/bin/env python # -*- coding: utf-8 -*- from django.shortcuts import render_to_response
def App( request ):
return render_to_response( 'subApp3/subApp3.html' )
# file: urls.py from django.conf.urls.defaults import *
urlpatterns = patterns('',
(r '^$' , 'subApp3.views.App' ),
) |
通过主Project的urls.py,与3个子App关联起来。耦合性非常低,可以方便的追加新的App或删除已有的App。
主Project的urls.py如下:
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from django.conf.urls.defaults import *
urlpatterns = patterns('',
(r '^siteWithApps/$' , 'siteWithApps.views.Init' ),
(r '^siteWithApps/apps/$' , 'siteWithApps.views.Contents' ),
(r '^siteWithApps/logincheck/$' , include( 'subApp1.urls' ) ),
(r '^siteWithApps/app2/$' , include( 'subApp2.urls' ) ),
(r '^siteWithApps/app3/$' , include( 'subApp3.urls' ) ),
) |
需要注意的一点是,为了能识别位于不同文件夹下的子App,需要在主Project的settings.py开始部分加入下面一段。
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# add for add isolate app import sys
def AddToPythonPath():
sys.path.append(r "D:/vim/python/django/django-apps/" )
AddToPythonPath() # end for add |
这样urls.py中的include就不会报错了。
主Project和子App的template如下:
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// file : siteWithApps->base.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>{% block title %}{% endblock %}</title>
</head>
<body>
{% if result %}
<a href="/siteWithApps/apps/"><h2>Go to Avilable APPS</h2></a>
{% else %}
<form action="/siteWithApps/logincheck/" method="post">
<label for="user_name">用户名:</label>
<input type="text" id="user_name" name="user_name" />
<label for="user_pass">密码 :</label>
<input type="text" id="user_pass" name="user_pass" />
<br />
<input type="submit" value="登录" />
</form
{% endif %}
{% block login_result %}{% endblock %}
</body>
</html> // file : siteWithApps->apps.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>{% block title %}{% endblock %}</title>
</head>
<body>
<h2>Go to Avilable APPS</h2>
<ul>
<li>
<a href="/siteWithApps/app2/">subApp2</a>
</li>
<li><a href="/siteWithApps/app3/">subApp3</a></li>
</ul>
{% block subApp %}{% endblock %}
</body>
</html> |
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// file : subApp1->check_login.html {% extends "siteWithApps/base.html" %} {% block title %}LoginCheck{% endblock %} {% block login_result %} <h2>输入的用户名和密码分别为:{{ user_name }} 和 {{ user_pass }}</h2> <label for="login_result">登录结果:</label> {% if result %} <h1>登录成功</h1> {% else %} <h1>登录失败</h1> {% endif %} {% endblock %} |
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// file : subApp2->subApp2.html {% extends "siteWithApps/apps.html" %} {% block title %}subApp 2{% endblock %} {% block subApp %} <h1>This sub App 2</h1> {% endblock %} |
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// file : subApp3->subApp3 {% extends "siteWithApps/apps.html" %} {% block title %}subApp 3{% endblock %} {% block subApp %} <h1>This sub App 3</h1> {% endblock %} |
整个工程的目录如下:
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D:\Vim\python\django |-django-apps
| |
| |-subApp1
| | |-urls.py
| | |-views.py
| | `-__init__.py
| |
| |-subApp2
| | |-urls.py
| | |-views.py
| | `-__init__.py
| |
| `-subApp3
| |-urls.py
| |-views.py
| `-__init__.py
|
|-django-templates
| |-siteWithApps
| | |-apps.html
| | `-base.html
| |
| |-subApp1
| | `-check_login.html
| |
| |-subApp2
| | `-subApp2.html
| |
| `-subApp3
| `-subApp3.html
|
`-siteWithApps
|-manage.py
|-settings.py
|-urls.py
|-views.py
`-__init__.py
|