Django 實現圖片上傳和下載功能
阿新 • • 發佈:2021-01-04
原生上傳圖片方式
#新建工程 python manage.py startapp test30 #修改 settings.py INSTALLED_APPS = [ 'django.contrib.admin','django.contrib.auth','django.contrib.contenttypes','django.contrib.sessions','django.contrib.messages','django.contrib.staticfiles','stu' ] #修改urls.py from django.conf.urls import url,include from django.contrib import admin urlpatterns = [ url(r'^admin/',admin.site.urls),url(r'student/',include('stu.urls')),] #新增加 stu/urls.py #coding:utf-8 from django.conf.urls import url import views urlpatterns = [ url(r'^$',views.index_view) ] #編輯 stu/views.py # -*- coding: utf-8 -*- from __future__ import unicode_literals from django.http import HttpResponse from django.shortcuts import render # Create your views here. #原生上傳檔案方式 def index_view(request): if request.method == 'GET': return render(request,'index.html') elif request.method == 'POST': #獲取請求引數 uname = request.POST.get('uname','') photo = request.FILES.get('photo','') print photo.name import os print os.getcwd() if not os.path.exists('media'): os.mkdir('media') #拼接路徑 with open(os.path.join(os.getcwd(),'media',photo.name),'wb') as fw: # photo.read() #一次性讀取檔案到記憶體 # fw.write(photo.read()) #分塊讀取,效能高 for ck in photo.chunks(): fw.write(ck) return HttpResponse('It is post request,上傳成功') else: return HttpResponse('It is not post and get request!') #新增加模板檔案 templates/index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form action="/student/" method="post" enctype="multipart/form-data"> {% csrf_token %} <p> <label for="ua">姓名: </label> <input type="text" name="uname" id="ua"/> </p> <p> <label for="ph">頭像: </label> <input type="file" name="photo" id="ph"/> </p> <p>      <input type="submit" value="註冊"/> </p> </form> </body> </html> #效果如下: 訪問: http://127.0.0.1:8000/student/
Django 圖片上傳方式
需求: 效果: 訪問 http://127.0.0.1:8000/student/ 通過註冊將姓名、頭像地址傳入資料庫中; 訪問 http://127.0.0.1:8000/student/showall 將資料庫資訊通過表格形式展示 ###過程 #修改 settings.py ,templates 新增加 'django.template.context_processors.media' TEMPLATES = [ { 'BACKEND': 'django.template.backends.django.DjangoTemplates','DIRS': [os.path.join(BASE_DIR,'templates')],'APP_DIRS': True,'OPTIONS': { 'context_processors': [ 'django.template.context_processors.debug','django.template.context_processors.request','django.contrib.auth.context_processors.auth','django.contrib.messages.context_processors.messages','django.template.context_processors.media' ],},] 末尾增加: # global_settings #指定上傳檔案儲存相對路徑(讀取檔案) MEDIA_URL = '/media/' #指定上傳檔案儲存絕對路徑(儲存檔案) MEDIA_ROOT = os.path.join(BASE_DIR,'media') #建立資料庫模型 stu/models.py # -*- coding: utf-8 -*- from __future__ import unicode_literals from django.db import models # Create your models here. class Student(models.Model): sno = models.AutoField(primary_key=True) sname = models.CharField(max_length=30) photo = models.ImageField(upload_to='imgs') def __unicode__(self): return u'Student:%s'%self.sname #生成資料庫遷移檔案,檢視資料庫表結構 python makemigrations stu python migrate #修改 urls.py 因為顯示問題,增加 DEBUG 內容 from django.conf.urls import url,include from django.contrib import admin from test30.settings import DEBUG,MEDIA_ROOT urlpatterns = [ url(r'^admin/',] from django.views.static import serve if DEBUG: urlpatterns+=url(r'^media/(?P<path>.*)/$',serve,{"document_root": MEDIA_ROOT}),#修改 urls, stu/urls.py #coding:utf-8 from django.conf.urls import url import views urlpatterns = [ url(r'^$',views.index_view),url(r'^upload/$',views.upload_view),url(r'^showall/$',views.showall_view) ] # 修改 stu/views.py #django 上傳檔案方式 def upload_view(request): uname = request.POST.get('uname','') photo = request.FILES.get('photo','') #入庫操作 Student.objects.create(sname=uname,photo=photo) return HttpResponse('上傳成功!') #顯示圖片 def showall_view(request): stus = Student.objects.all() print stus return render(request,'show.html',{'stus':stus}) # 修改 index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form action="/student/upload/" method="post" enctype="multipart/form-data"> {% csrf_token %} <p> <label for="ua">姓名: </label> <input type="text" name="uname" id="ua"/> </p> <p> <label for="ph">頭像: </label> <input type="file" name="photo" id="ph"/> </p> <p>      <input type="submit" value="註冊"/> </p> </form> </body> </html> # 增加模板檔案 show.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <table width="500px" border="1" cellspacing="0"> <tr> <th>編號</th> <th>姓名</th> <th>頭像</th> <th>操作</th> </tr> {% for stu in stus %} <tr> <td>{{ forloop.counter }}</td> <td>{{ stu.sname }}</td> <td><img style="width: 200px;" src="{{ MEDIA_URL }}{{ stu.photo }}"/></td> <td> 下載</td> </tr> {% endfor %} </table> </body> </html> 效果圖: http://127.0.0.1:8000/student/ 註冊實現資料庫錄入操作(點選提交通過index.html 中action="/student/upload/" 將url 轉發至函式upload_view ,實現上傳功能) http://127.0.0.1:8000/student/showall/ 實現資料庫資訊展示
圖片下載功能
### 需求 在顯示頁面點選下載實現圖片的下載功能 過程: #修改 show.html ,加入 下載的超連結 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <table width="500px" border="1" cellspacing="0"> <tr> <th>編號</th> <th>姓名</th> <th>頭像</th> <th>操作</th> </tr> {% for stu in stus %} <tr> <td>{{ forloop.counter }}</td> <td>{{ stu.sname }}</td> <td><img style="width: 200px;" src="{{ MEDIA_URL }}{{ stu.photo }}"/></td> <td><a href="/student/download/?photo={{ stu.photo }}" rel="external nofollow" >下載</a></td> </tr> {% endfor %} </table> </body> </html> #因為 show.html href="/student/download ,所以要修改urls #修改 stu/urls.py,新增加 url url(r'^download/$',views.download_view) #修改 stu/views.py def download_view(request): # 獲取請求引數(圖片儲存位置) imgs/5566.jpg photo = request.GET.get('photo','') print photo # 獲取圖片檔名5566.jpg ; rindex 為字元 '/' 在 photo 中最後出現的位置索引;例如 # txt = "imgs/5566.jpg" # x = txt.rindex("/") # print txt[x + 1:] 輸出結果為 5566.jpg filename = photo[photo.rindex('/')+1:] print filename #開啟一個流 import os path = os.path.join(os.getcwd(),photo.replace('/','\\')) print path with open(path,'rb') as fr: response = HttpResponse(fr.read()) response['Content-Type']='image/png' response['Content-Disposition'] = 'attachment;filename=' + filename return response #訪問 http://127.0.0.1:8000/student/showall/ ,點選下載
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