5网站建站,环境建设公司属于什么企业,百度如何建设自己的网站,绵阳网站seoDjango视图和URL
一、课程概述
学习项目具体内容预计用时视图基础函数视图、类视图、视图装饰器90分钟URL配置URL模式、路由系统、命名URL60分钟请求处理请求对象、响应对象、中间件90分钟 二、视图基础
2.1 函数视图
# blog/views.py
from django.shortcuts import render…Django视图和URL
一、课程概述
学习项目具体内容预计用时视图基础函数视图、类视图、视图装饰器90分钟URL配置URL模式、路由系统、命名URL60分钟请求处理请求对象、响应对象、中间件90分钟 二、视图基础
2.1 函数视图
# blog/views.py
from django.shortcuts import render, get_object_or_404, redirect
from django.http import HttpResponse
from .models import Post, Category
from .forms import PostForm# 简单的函数视图
def hello_world(request):return HttpResponse(Hello, Django!)# 带模板渲染的视图
def post_list(request):posts Post.objects.all().order_by(-publish)return render(request, blog/post_list.html, {posts: posts})# 处理表单的视图
def post_create(request):if request.method POST:form PostForm(request.POST)if form.is_valid():post form.save(commitFalse)post.author request.userpost.save()return redirect(blog:post_detail, post.id)else:form PostForm()return render(request, blog/post_form.html, {form: form})# 详情视图
def post_detail(request, post_id):post get_object_or_404(Post, idpost_id)return render(request, blog/post_detail.html, {post: post})2.2 类视图
# blog/views.py
from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView
from django.urls import reverse_lazy
from django.contrib.auth.mixins import LoginRequiredMixin# 列表视图
class PostListView(ListView):model Posttemplate_name blog/post_list.htmlcontext_object_name postspaginate_by 10ordering [-publish]def get_queryset(self):queryset super().get_queryset()category_id self.request.GET.get(category)if category_id:queryset queryset.filter(category_idcategory_id)return queryset# 详情视图
class PostDetailView(DetailView):model Posttemplate_name blog/post_detail.htmlcontext_object_name post# 创建视图
class PostCreateView(LoginRequiredMixin, CreateView):model Posttemplate_name blog/post_form.htmlfields [title, body, category, status]success_url reverse_lazy(blog:post_list)def form_valid(self, form):form.instance.author self.request.userreturn super().form_valid(form)# 更新视图
class PostUpdateView(LoginRequiredMixin, UpdateView):model Posttemplate_name blog/post_form.htmlfields [title, body, category, status]def get_success_url(self):return reverse_lazy(blog:post_detail, kwargs{pk: self.object.pk})# 删除视图
class PostDeleteView(LoginRequiredMixin, DeleteView):model Postsuccess_url reverse_lazy(blog:post_list)template_name blog/post_confirm_delete.html2.3 视图装饰器
# blog/views.py
from django.contrib.auth.decorators import login_required, permission_required
from django.views.decorators.http import require_http_methods
from django.views.decorators.cache import cache_page# 登录要求装饰器
login_required
def profile(request):return render(request, blog/profile.html, {user: request.user})# HTTP方法限制装饰器
require_http_methods([GET, POST])
def post_edit(request, post_id):post get_object_or_404(Post, idpost_id)if request.method POST:# 处理POST请求passreturn render(request, blog/post_edit.html, {post: post})# 缓存装饰器
cache_page(60 * 15) # 缓存15分钟
def category_list(request):categories Category.objects.all()return render(request, blog/category_list.html, {categories: categories})三、URL配置
3.1 URL模式
# blog/urls.py
from django.urls import path
from . import viewsapp_name blogurlpatterns [# 函数视图URLpath(, views.post_list, namepost_list),path(post/int:post_id/, views.post_detail, namepost_detail),path(post/new/, views.post_create, namepost_create),# 类视图URLpath(posts/, views.PostListView.as_view(), nameposts),path(post/int:pk/detail/, views.PostDetailView.as_view(), namepost_detail),path(post/add/, views.PostCreateView.as_view(), namepost_add),path(post/int:pk/edit/, views.PostUpdateView.as_view(), namepost_edit),path(post/int:pk/delete/, views.PostDeleteView.as_view(), namepost_delete),# 带参数的URLpath(category/slug:category_slug/, views.category_posts, namecategory_posts),path(tag/slug:tag_slug/, views.tag_posts, nametag_posts),path(archive/int:year/int:month/, views.archive_posts, namearchive_posts),
]3.2 高级URL配置
# myproject/urls.py
from django.contrib import admin
from django.urls import path, include
from django.conf import settings
from django.conf.urls.static import staticurlpatterns [path(admin/, admin.site.urls),path(blog/, include(blog.urls, namespaceblog)),path(api/, include(blog.api.urls)), # API URLspath(accounts/, include(django.contrib.auth.urls)),
] static(settings.MEDIA_URL, document_rootsettings.MEDIA_ROOT)# 自定义错误页面
handler404 myproject.views.custom_404
handler500 myproject.views.custom_500四、请求和响应处理
4.1 请求对象
# blog/views.py
def process_request(request):# 获取GET参数page request.GET.get(page, 1)category request.GET.get(category)# 获取POST数据if request.method POST:title request.POST.get(title)content request.POST.get(content)# 获取文件if request.FILES:image request.FILES[image]# 获取cookiesuser_id request.COOKIES.get(user_id)# 获取session数据cart request.session.get(cart, {})# 获取用户信息if request.user.is_authenticated:username request.user.username4.2 响应对象
# blog/views.py
from django.http import JsonResponse, FileResponse, StreamingHttpResponse
from django.shortcuts import render, redirectdef multiple_responses(request):# HTML响应return render(request, template.html, context)# 重定向return redirect(blog:post_list)# JSON响应data {status: success, message: Data received}return JsonResponse(data)# 文件下载file_path path/to/file.pdfreturn FileResponse(open(file_path, rb))# 流式响应def file_iterator(file_path, chunk_size8192):with open(file_path, rb) as f:while True:chunk f.read(chunk_size)if not chunk:breakyield chunkreturn StreamingHttpResponse(file_iterator(file_path))4.3 中间件
# blog/middleware.py
import time
from django.utils.deprecation import MiddlewareMixinclass RequestTimingMiddleware(MiddlewareMixin):def process_request(self, request):request.start_time time.time()def process_response(self, request, response):if hasattr(request, start_time):duration time.time() - request.start_timeresponse[X-Request-Duration] str(duration)return response# settings.py
MIDDLEWARE [django.middleware.security.SecurityMiddleware,django.contrib.sessions.middleware.SessionMiddleware,django.middleware.common.CommonMiddleware,django.middleware.csrf.CsrfViewMiddleware,django.contrib.auth.middleware.AuthenticationMiddleware,django.contrib.messages.middleware.MessageMiddleware,django.middleware.clickjacking.XFrameOptionsMiddleware,blog.middleware.RequestTimingMiddleware, # 自定义中间件
]五、实战示例博客搜索功能
# blog/views.py
from django.db.models import Qdef post_search(request):query request.GET.get(q, )results []if query:results Post.objects.filter(Q(title__icontainsquery) |Q(body__icontainsquery) |Q(tags__name__icontainsquery)).distinct()return render(request,blog/search.html,{query: query,results: results})# blog/templates/blog/search.html
{% extends blog/base.html %}{% block content %}h2搜索结果/h2form methodgetinput typetext nameq value{{ query }} placeholder搜索文章...button typesubmit搜索/button/form{% if query %}h3包含 {{ query }} 的文章/h3{% if results %}{% for post in results %}articleh4a href{% url blog:post_detail post.id %}{{ post.title }}/a/h4p{{ post.body|truncatewords:30 }}/p/article{% endfor %}{% else %}p没有找到相关文章。/p{% endif %}{% endif %}
{% endblock %}六、常见问题和解决方案
处理404错误
# views.py
from django.http import Http404def post_detail(request, post_id):try:post Post.objects.get(idpost_id)except Post.DoesNotExist:raise Http404(Post does not exist)return render(request, blog/post_detail.html, {post: post})CSRF验证
!-- templates/form.html --
form methodpost{% csrf_token %}{{ form.as_p }}button typesubmit提交/button
/form文件上传处理
# views.py
def upload_file(request):if request.method POST and request.FILES[file]:myfile request.FILES[file]fs FileSystemStorage()filename fs.save(myfile.name, myfile)uploaded_file_url fs.url(filename)return render(request, upload.html, {uploaded_file_url: uploaded_file_url})return render(request, upload.html)七、作业和练习
实现一个完整的CRUD操作系统创建自定义的中间件实现文件上传和下载功能编写RESTful风格的URL设计实现用户认证和授权系统
八、扩展阅读
Django CBV (Class-Based Views) 详解Django中间件开发最佳实践RESTful API设计原则Django安全最佳实践 怎么样今天的内容还满意吗再次感谢朋友们的观看关注GZH凡人的AI工具箱回复666送您价值199的AI大礼包。最后祝您早日实现财务自由还请给个赞谢谢
