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Django之url映射

<div class="markdown-here-wrapper" data-md-url="https://i.cnblogs.com/EditPosts.aspx?opt=1"&gt;
<h1 id="url-" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 24px; border-bottom: 2px solid #aaaaaa;">url映射的作用
<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">根据Django的MTV模式,url的映射是根据用户输入或传送而来的url路径,来进行区分去执行相应的view函数来响应用户的操作。


<h1 id="url-" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 24px; border-bottom: 2px solid #aaaaaa;">url映射的方式
<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">Django项目的创建后,会自动创建和你项目名称相同的全局文件包,urls.py就在其中。

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
urlpatterns = [
    path(,admin.site.urls),]

自动添加的一条映射。我们的view函数在自己创建的app中,所以需要先引入app文件包中的views

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
 blog  views

添加自己的映射条件,例如

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
 blog  views
urlpatterns = [
    path(,path(,views.blog)

]


<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">写相应的视图函数

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
 django.shortcuts  render,HttpResponse

<span class="hljs-function" style="color: #7aa6da;"><span class="hljs-keyword" style="color: #c397d8;">def <span class="hljs-title" style="color: #969896;">blog<span class="hljs-params" style="color: #e78c45;">(request):
<span class="hljs-keyword" style="color: #c397d8;">return HttpResponse(<span class="hljs-string" style="color: #b9ca4a;">"WELCOME")


<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">这样在浏览器中输入127.0.0.1:8000/blog/就能看到返回的WELCOME了。


<h1 id="url-" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 24px; border-bottom: 2px solid #aaaaaa;">url映射的函数
<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">urlpatterns中可以使用两种函数,path()用来字符串路由,re_path()处理正则式路由。


<h3 id="path-" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 20px; border-bottom: 1px solid #aaaaaa;">path函数
<h5 id="-" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 16px; border-bottom: 0.5px solid #aaaaaa;">必须有的参数
<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">path()中有两个必须填的参数,一个是路径字符串,一个是所调用函数。就如上边的例子

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
path(,views.blog)

加上blog/的情况,然后执行views下的blog函数,表示静态,精确的映射。路径字符串除了填精确的路径外,还可以填<类型:变量名>,可以在匹配 url的同时传递参数,而且匹配的范围更加庞大。例如:

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
path(/year/',views.year)

函数。这里注意:views.year函数的参数名必须和你在url映射时起的名字相同,即“year”。这里的数据类型还有其他几种:

ottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: #cccccc; background-color: white; margin: 0px; padding: 0px;"> ottom-style: initial; border-left-style: initial; border-right-color: initial; border-bottom-color: initial; border-left-color: initial; border-image: initial; border-top-style: solid; border-top-color: #cccccc; background-color: white; margin: 0px; padding: 0px;"> ottom: 0.5px solid #aaaaaa;">非必要参数

一个是用来给视图函数传递的参数,一个是别名。用来给视图函数传递的参数除了上述直接在url中,还可以手动指定填入path()中,以字典的形式填入,因为这里的参数类型为**kwargs。而视图函数中的参数同样必须和字典中的键名相同。例如:

:,:})

<span class="hljs-function" style="color: #7aa6da;"><span class="hljs-keyword" style="color: #c397d8;">def <span class="hljs-title" style="color: #969896;">year<span class="hljs-params" style="color: #e78c45;">(req,year,name,age):
str1=str(year)+<span class="hljs-string" style="color: #b9ca4a;">" "+name+<span class="hljs-string" style="color: #b9ca4a;">" "+str(age)
<span class="hljs-keyword" style="color: #c397d8;">return HttpResponse(str1)


<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">如果url参数和字典类型参数都使用了,并且名称相同,如:

:})

函数中只能添加一个year参数,并且在字典中的year的数据20会覆盖掉url中的数据。最后一个参数是别名,例如:

)

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
 = =>

ottom: 1px solid #aaaaaa;">re_path()函数

函数和path()函数类似,但它是使用正则表达式的模式来代替字符串模式进行匹配,只要符合正则式的模式就可以匹配成功。

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
re_path(,views.day)

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
re_path(,views.day)

自动当参数传递给视图函数,但是视图函数的形参必须要多写一个参数,名字任意。

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
re_path(\d+)/day/",views.day)

函数必须以其名字作为参数名,同样,如果手动添加的参数与其名称相同,那么手动添加的参数数据会将正则式中的覆盖。

ottom: 1px solid #aaaaaa;">路由分发

一个项目中有多个app,那么所有的映射都写到同一个urls.py,或者公用一个url,难免会产生错误,产生混淆,那么我们可以在每个app下建立自己的urls.py来处理自己的映射关系,在全局urls下进行分发。具体方式为:在全局urls中添加

))

文件夹下创建urls.py文件,在文件中写入

display: block; overflow: auto; overflow-x: auto; background: black; color: #eaeaea; text-size-adjust: none;">
 django.urls  path,re_path
 blog  views

urlpatterns = [
path(<span class="hljs-string" style="color: #b9ca4a;">"login/",views.login)

]


<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">那么在地址栏中输入/blog/login,就会先由全局urls分发到blog下的urls,再进行相应的视图函数映射。

<ul style="margin: 1.2em 0px; padding-left: 2em; list-style-type: square; font-size: 16px;">
<li style="margin: 0.5em 0px; font-size: 16px;">最后有一点要注意,所有的url映射都是从上到下按顺序匹配,遇到第一个匹配成功后就不在往下进行了。

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</tr>
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<td style="text-align: center; font-size: 1em; border: 1px solid #cccccc; margin: 0px; padding: 0.5em 1em;">slug</td>
<td style="font-size: 1em; border: 1px solid #cccccc; margin: 0px; padding: 0.5em 1em;">匹配字母、数字、横杠、下划线组成的字符串,str的子集</td>

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<td style="font-size: 1em; border: 1px solid #cccccc; margin: 0px; padding: 0.5em 1em;">匹配任何非空字符串,包括路径分隔符,是全集</td>

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