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什么是短url：

简单讲就是把普通正常访问的网址，转换成比较短的网址，例如：https://www.cnblogs.com/angelyan/articles/10667354.html#_label0 转成https://dwz.cn/p8VGVkMt

作用优点：短，字符少，美观，便于发布，传播，突破某些平台限制

原理步骤：

1.浏览器解析DNS，获取域名对应的ip

2.获取ip，发送http请求，获取p8VGVkMt对应的长链接地址

3.http通过301重定向，转到对应的长链接页面

算法原理：

利用数据库自增id，每一次短url获取一个数据库id，将id进行62进制转换，获得一个短码，这样的短码最长8位，最短1位。

#url路由部分 from django.conf.urls import url from django.contrib import admin from app01 import views urlpatterns = [ url(r‘^admin/‘, admin.site.urls), url(r‘^$‘, views.index), url(r‘^addShortUrl/$‘, views.addShortUrl), url(r‘^restoreUrl/$‘, views.restoreUrl), url(r‘^([A-Za-z0-9]+)/‘, views.url), ]

#模型表部分 from django.db import models # Create your models here. # 短url表 class ShortUrl(models.Model): id=models.AutoField(primary_key=True) # 短url short_url=models.CharField(max_length=255) # 原始url ori_url = models.TextField() # 短url有效期 period=models.DateTimeField() def __str__(self): return self.short_url

#视图view部分 from django.shortcuts import render,redirect from django.http import HttpResponse,JsonResponse # Create your views here. import re,datetime,time from app01 import models baseList = ‘0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ‘ # 10进制转62进制 def changeBase(n,b): # 返回一个包含商和余数的元组(n // b, n % b) x,y = divmod(n,b) print(x,y) if x>0: return changeBase(x,b) + baseList[y] else: return baseList[y] # 利用mysql数据库的自增id生成n，然后转成62进制，再将62进制应对的长url存进mysql，下次访问时查询62进制的短url对应的长url， # 最后重定向301到长url上 def index(request): if request.method=="GET": return render(request, "index.html") def url(request,url): if request.method=="GET": res = models.ShortUrl.objects.filter(short_url=url).first() if not res or not res.ori_url: return HttpResponse("没有此短网址") if time.time()-int(time.mktime(res.period.timetuple()))>0: return HttpResponse("短网址已失效") return redirect(res.ori_url) if request.method=="POST": return HttpResponse("Request error") def addShortUrl(request): if request.is_ajax(): response = {"status": 100, "msg": None} long = request.POST.get(‘long‘) period = request.POST.get(‘period‘) print(long,period) res=re.search("^(http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)?" "((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\." "(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\." "(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\." "(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|" "([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.[a-zA-Z]{2,4})(\:[0-9]+)?" "(/[^/][a-zA-Z0-9\.\,\?\‘\\/\+&%\$#\=~_\[email protected]]*)*$",long) if not res: response["msg"]="网址错误" response["status"]=101 elif period !="一年期" and period !="长期": response["msg"] = "有效期格式错误" response["status"] = 102 else: date=datetime.datetime.now() if period=="一年期": date = datetime.datetime.now() + datetime.timedelta(days=365) if period=="长期": date = datetime.datetime.now() + datetime.timedelta(days=365*5) res = models.ShortUrl.objects.create(period=date) print(res.id) n=res.id short_url=changeBase(n,62) if short_url=="admin" or short_url=="addShortUrl" or short_url=="restoreUrl": response["msg"] = "请求再转换一次试试" response["status"] = 103 else: models.ShortUrl.objects.filter(id=n).update(short_url=short_url,ori_url=long) response["msg"] = short_url return JsonResponse(response) if request.method == "GET": return HttpResponse("No get method") def restoreUrl(request): if request.is_ajax(): response = {"status": 100, "msg": None} short = request.POST.get(‘short‘) res = re.search("^(http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)?" "((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\." "(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\." "(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\." "(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|" "([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.[a-zA-Z]{2,4})(\:[0-9]+)?" "(/[^/][a-zA-Z0-9\.\,\?\‘\\/\+&%\$#\=~_\[email protected]]*)*$", short) if not res or "/" not in short: response["msg"] = "网址错误" response["status"] = 101 else: short_url=short.split("/")[-1] res=models.ShortUrl.objects.filter(short_url=short_url).first() print(res) if not res: response["msg"] = "没有该短网址" response["status"] = 102 else: response["msg"] = res.ori_url return JsonResponse(response)