使用文件缓存
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
'LOCATION': '/var/tmp/django_cache',
'TIMEOUT': 3600,
'OPTIONS': {
'MAX_ENTRIES': 1000
}
}
}
全站缓存
#settings.py
CACHE_MIDDLEWARE_ALIAS = "default"
CACHE_MIDDLEWARE_SECONDS = 300
CACHE_MIDDLEWARE_KEY_PREFIX = '站点名'
MIDDLEWARE_CLASSES = (
'django.middleware.cache.UpdateCacheMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.cache.FetchFromCacheMiddleware',
)
用户页面
用户信息页面在登出后不能继续用缓存页面, 而要刷新
使用@vary_on_cookie装饰器
from django.views.decorators.vary import vary_on_cookie
from django.contrib.auth.decorators import login_required
@login_required(login_url="/login/")
@vary_on_cookie
def profile(request):
# do something here...
return HttpResponse(...)
页面级缓存
from django.views.decorators.cache import cache_page,cache_control
@cache_page(60*5)
@cache_control(must_revalidate=True,max_age=60*5)
def profile(request):
# do something here...
return HttpResponse(...)
基于类的视图缓存
from django.views.decorators.cache import cache_page,cache_control
from app.views import *
urlpatterns = [
url(r'^$',cache_page(60*5)(cache_control(must_revalidate=True,max_age=60*5)(IndexView.as_view()),name="index")),
]
刷新缓存
from django.core.cache import cache
from django.http import HttpRequest
from django.utils.cache import get_cache_key
def expire_page(request,path):
# The cache of request url after 'expire/' will be deleted,
# so you will get a fresh page !
request2 = HttpRequest()
request2.META['SERVER_NAME'] = request.META['SERVER_NAME']
request2.META['SERVER_PORT'] = request.META['SERVER_PORT']
request2.path = request.get_host()+'/'+path
print request2.build_absolute_uri()
key = get_cache_key(request2)
if cache.has_key(key):
cache.delete(key)
return HttpResponse("OK, the cache is refreshed")
本质上是利用HttpRequest伪造了一个与想要清除缓存的URL地址相同的请求，通过get_cache_key这个函数生成cache_key，然后删除对应的cache，达到刷新页面的效果。函数可以进一步改进至用户前台输入path，然后清除缓存后通过Ajax返回成功信息...