Python學習---django知識補充之CBV
阿新 • • 發佈：2018-08-01
patch python學習 時間 結果 borde pps pattern .sh display
Django知識補充之CBV
Django:
url --> def函數 FBV[function based view] 用函數和URL進行匹配
url --> 類 CBV[function based view] 用類和URL進行匹配
POSTMAN插件
http://blog.csdn.net/zzy1078689276/article/details/77528249
基於CBV的登錄實例：
settings.py
INSTALLED_APPS = [ ... ‘app01‘, # 註冊app ] STATICFILES_DIRS = (os.path.join(BASE_DIR, "statics"),) # 現添加的配置,這裏是元組，註意逗號 TEMPLATES = [ ... ‘DIRS‘: [os.path.join(BASE_DIR, ‘templates‘)], ]
urls.py
from django.contrib import admin from django.urls import path from django.conf.urls import url, include from app01 import views urlpatterns = [ # 基於CBV的登錄 # url(r‘^login.html/‘, views.login), # 原來基於函數 url(r‘^login.html/‘, views.Login.as_view()), # 現在基於類名.as_view() ]
views.py
from django.shortcuts import render, redirect
from app01 import models
# 基於CBV的登錄,需要導入views
from django import views
class Login(views.View):
# http_method_names = [‘get‘, ‘post‘, ‘put‘, ‘patch‘, ‘delete‘, ‘head‘, ‘options‘, ‘trace‘]
def get(self, request, *args, **kwargs):
print(request.method, ‘GGGGGGGGGGGG‘)
message = ‘‘
return render(request, ‘login.html‘, {‘message‘: message}) # 這裏是網頁html
def post(self, request, *args, **kwargs):
print(request.method, ‘OOOOOOOOOOOOO‘)
username = request.POST.get("user")
password = request.POST.get("pass")
print(‘username: %s, password:%s‘ % (username, password))
# obj = models.Administrator.objects.filter(username=username, password=password).count()
# if obj: 從數據庫內取出數據，進行判斷也可以
if username == ‘root‘ and password == ‘root‘:
req = redirect(‘/index.html/‘) # 接收redirect對象，# 這裏是瀏覽器路徑，偽靜態
# req.set_cookie(‘username‘, username, max_age=10) # 設置超時時間10s
import datetime
timeout = datetime.datetime.now() + datetime.timedelta(seconds=10)
req.set_cookie(‘username‘, username, max_age=10, expires=timeout)
# IE設置超時時間10s
return req
# return redirect(‘/index.html‘) # 與上面3行同，只是添加了Cookie
else:
message = ‘用戶名或密碼錯誤‘
return render(request, ‘login.html‘, {‘message‘: message}) # 這裏是網頁htmltemplates/login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
{# 偽靜態#}
<form action="/login.html/" method="post">
{% csrf_token %} {# 為跨站請求 #}
<div>
<label for="user">用戶名</label>
<input id="user" name="user" type="text">
</div>
<div>
<label for="pass">密 碼</label>
<input id="pass" name="pass" type="password">
</div>
<div>
<label></label>
<input value="登錄" type="submit">
<span style="color: red">{{ message }}</span>
</div>
</form>
</body>
</html>templates/index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<h2>hello, {{ username }}</h2>
</body>
</html>
頁面顯示:
CBV基於裝飾器的使用<一> ---基於Python舊方法
CBV基於裝飾器的使用<一> ---基於Python舊方法
裝飾器：函數執行之前/後可以增加擴展功能
有多個方法的時候，必須給每個方法添加裝飾器哈
CBV的反射原理
單一裝飾器
views.py
from django.shortcuts import render, redirect
from app01 import models
# 基於CBV的登錄,需要導入views
from django import views
from django.utils.decorators import method_decorator # 導入裝飾器
# 基於CBV的裝飾器的使用
def outer(func):
def inner(request, *args, **kwargs):
print(request.method)
return func(request, *args, **kwargs)
return inner
class Login(views.View):
# http_method_names = [‘get‘, ‘post‘, ‘put‘, ‘patch‘, ‘delete‘, ‘head‘, ‘options‘, ‘trace‘]
@method_decorator(outer)
def get(self, request, *args, **kwargs):
message = ‘‘
return render(request, ‘login.html‘, {‘message‘: message}) # 這裏是網頁html
@method_decorator(outer)
def post(self, request, *args, **kwargs):
username = request.POST.get("user")
password = request.POST.get("pass")
print(‘username: %s, password:%s‘ % (username, password))
# obj = models.Administrator.objects.filter(username=username, password=password).count()
# if obj: 從數據庫內取出數據，進行判斷也可以
if username == ‘root‘ and password == ‘root‘:
req = redirect(‘/index.html/‘) # 接收redirect對象，# 這裏是瀏覽器路徑，偽靜態
# req.set_cookie(‘username‘, username, max_age=10) # 設置超時時間10s
import datetime
timeout = datetime.datetime.now() + datetime.timedelta(seconds=10)
req.set_cookie(‘username‘, username, max_age=10, expires=timeout)
# IE設置超時時間10s
return req
# return redirect(‘/index.html‘) # 與上面3行同，只是添加了Cookie
else:
message = ‘用戶名或密碼錯誤‘
return render(request, ‘login.html‘, {‘message‘: message}) # 這裏是網頁html
CBV基於裝飾器的使用<二> --基於Django的dispatch[多個裝飾器]
CBV基於裝飾器的使用<二> --基於Django的dispatch[多個裝飾器]
如果對某一種請求做處理： 單一裝飾器
如果對所有的請求做處理： dispatch單一裝飾器
添加裝飾器有2中方法:
1.類上添加
2.方法上添加
自定義轉發dispatch函數
from django import views
from django.utils.decorators import method_decorator # 導入裝飾器
class Login(views.View):
# http_method_names = [‘get‘, ‘post‘, ‘put‘, ‘patch‘, ‘delete‘, ‘head‘, ‘options‘, ‘trace‘]
# 自定義轉發器，URL進來都在此處進行URL轉發，我們可以有一些預操作[函數驗證可以放此處]
def dispatch(self, request, *args, **kwargs):
print(‘自定義dispatch: 前‘)
# if request.method == ‘POST‘:
# return HttpResponse("Good Bye") # 預操作處理
# 請求先到Login的dispatch，然後調用父類的dispatch，返回結果給了obj
obj = super(Login, self).dispatch(request, *args, **kwargs) # 自定義轉發且調用父類dispatch
# 將父類的返回結果返回給界面，否則界面報錯
print(‘自定義dispatch: 後‘)
return obj
def get(self, request, *args, **kwargs):
message = ‘‘
return render(request, ‘login.html‘, {‘message‘: message}) # 這裏是網頁html
...同上
Python學習---django知識補充之CBV