python 学习笔记十九 django深入学习四 cookie,session

CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',# 引擎
'LOCATION': os.path.join(BASE_DIR, 'cache'), # cache文件的存放路径
'TIMEOUT': 600,# 缓存超时时间（默认300，None表示永不过期，0表示立即过期）
'OPTIONS': {
'MAX_ENTRIES': 1000 #最大缓存个数（默认300）
}
}
}

配置如下：
from django.conf.urls import url
from django.contrib import admin
from app01 import views #导入app的views函数
urlpatterns = [
url(r'^admin/', admin.site.urls),
#设置当用户访问ip：端口/time时候使用这个函数
url(r'cache/',views.cache_page),
]

from django.views.decorators.cache import cache_page
from django.shortcuts import render,HttpResponse
#这里设置的是 60秒 * 15 ,15分钟之后
@cache_page(60 * 15)
def cache_page(request):
current = str(time.time())
return HttpResponse(current)

request.session.set_expiry(value)
* 如果value是个整数，session会在些秒数后失效。
* 如果value是个datatime或timedelta，session就会在这个时间后失效。
* 如果value是0,用户关闭浏览器session就会失效。
* 如果value是None,session会依赖全局session失效策略。

# views
from django.shortcuts import render,HttpResponseRedirect
# Create your views here.def index(request):
#从请求里获取username session
#首先判断存不存在session，如果不存在跳转到login页面
is_login = request.session.get("is_login", False)
if is_login:
# 这里可以根据登录的用户显示不同的数据
# username = request.session.get("username")
# retrun render(request,"xxx.html")
return httpResponse("index")
else:
return redirect("/login/")
def login(request):
if request.method == 'POST':
username = request.POST.get('username')
password = request.POST.get('password')
if username == "koka" and password=="123456":
# 设置session
request.session['is_login'] = True
# 可以设置多个值
request.session["username"] = username
return redirect('/index/')
return render(request, "login.html")def logout(request):
#删除session
del request.session["session_name"]
return redirect('/login/')

1.python manage.py makemigrations
2.python manage.py mirate

def login(func):
def wrap(request, *args, **kwargs):
# 如果未登陆，跳转到指定页面
if request.path == '/test/':
return redirect('http://www.baidu.com')
return func(request, *args, **kwargs)
return wrap

request.COOKIES['key']
request.get_signed_cookie(key, default=RAISE_ERROR, salt='', max_age=None)
参数：
default: 默认值
salt: 加密盐
max_age: 后台控制过期时间

rep = HttpResponse(...) 或 rep ＝ render(request, ...) rep.set_cookie(key,value,...)
rep.set_signed_cookie(key,value,salt='加密盐',...)
参数：
key, 键
value='', 值
max_age=None, 超时时间
expires=None, 超时时间(IE requires expires, so set it if hasn't been already.)
path='/', Cookie生效的路径，/ 表示根路径，特殊的：跟路径的cookie可以被任何url的页面访问
domain=None, Cookie生效的域名
secure=False, https传输
httponly=False 只能http协议传输，无法被JavaScript获取（不是绝对，底层抓包可以获取到也可以被覆盖）

<script src='/static/js/jquery.cookie.js'></script>
$.cookie("list_pager_num", 30,{ path: '/' });

from django.contrib.auth import authenticate
user = authenticate(username='john', password='secret')
if user is not None:
# the password verified for the user
if user.is_active:
print("User is valid, active and authenticated")
else:
print("The password is valid, but the account has been disabled!")
else:
# the authentication system was unable to verify the username and password
print("The username and password were incorrect.")

from django.contrib.auth import authenticate, logindef my_view(request):
username = request.POST['username']
password = request.POST['password']
user = authenticate(username=username, password=password)
if user is not None:
if user.is_active:
login(request, user)
# Redirect to a success page.
else:
# Return a 'disabled account' error message
...
else:
# Return an 'invalid login' error message.
...

from django.contrib.auth import logoutdef logout_view(request):
logout(request)
# Redirect to a success page.

from django.contrib.auth.decorators import login_required@login_required
def my_view(request):
...

login

ajax

function Ajaxsubmit(){
var host = '192.168.1.100';
var port = '8000';
$.ajax({
url:"/ajax_data/", #目标URL
type:'POST', #请求方式
data:{h:host,p:port},
success:function(arg){
console.log(arg)
}
})
}

<script>
function Ajaxsubmit(){
var array_users = [
{'username':'koka','arg':18},
{'username':'akok','arg':18},
{'username':'kako','arg':18}, ];
$.ajax({
url:"/ajax_mdata/",
type:'POST',
# 以原生的模式传过去
tradition: true,
#把数组json序列化转成字符串
data:{data:JSON.stringify(array_users)},
success:function(arg){
var callback_dict = $.parseJSON(arg);//json反序列化把字符串转换为对象
if(callback_dict){
alert('提交成功') }
else{
alert(callback_dict.error)
}
}
})
}
</script>