1、settings.py 中配置缓存

# 缓存配置
CACHES = {
    # django存缓默认位置,redis 0号库
    # default: 连接名称
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/0",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    },
    # django session存 reidis 1 号库（现在基本不需要使用）
    "session": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/1",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    },
    # 图形验证码，存redis 2号库
    "img_code": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/2",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    }
}
# 配置session使用redis存储
SESSION_ENGINE = "django.contrib.sessions.backends.cache"
# 配置session存储的位置: 使用cache中的 session配置
SESSION_CACHE_ALIAS = "session"

2、图片验证码captcha使用

1.下载captcha压缩包captcha.zip，放到项目packages文件夹下 
2.解压captcha.zip放到syl/libs文件夹下 
3.解压文件中的syl/libs/captcha/captcha.py 右键运行即可生成图片验证码 
unzip xxx.zip
3、在views.py中使用
from django.shortcuts import render

# Create your views here.

from django.http import HttpResponse, HttpResponseForbidden
from django.views import View
from django_redis import get_redis_connection
from libs.captcha.captcha import captcha

class ImageCodeView(View):
    def get(self, request):
        # 1.接收数据
        uuid = request.GET.get('uuid')

        # 2.校验数据
        if not uuid:
            return HttpResponseForbidden('uuid无效')

        # 3.处理业务
        # 获取图片文本内容和图片二进制代码
        text, image = captcha.generate_captcha()

        # 4.把uuid和图片文本存入redis
        redis_client = get_redis_connection('img_code')     # 获取redis客户端

        # 5.写入redis(是字符串)
        redis_client.setex(uuid, 60 * 5, text)

        # 6.返回响应图片
        return HttpResponse(image, content_type='image/jpg')