flask的重定向(redirect)传递参数的方法

flask中的重定向redirect方法常常被用来跳转页面,那redirect在跳转页面的同时能不能传递我们下一个页面需要的参数呢?

带着这个问题我看了redirect()的源码,如下:

 1 def redirect(location, code=302, Response=None):
 2     """Returns a response object (a WSGI application) that, if called,
 3     redirects the client to the target location.  Supported codes are 301,
 4     302, 303, 305, and 307.  300 is not supported because it's not a real
 5     redirect and 304 because it's the answer for a request with a request
 6     with defined If-Modified-Since headers.
 7 
 8     .. versionadded:: 0.6
 9        The location can now be a unicode string that is encoded using
10        the :func:`iri_to_uri` function.
11 
12     .. versionadded:: 0.10
13         The class used for the Response object can now be passed in.
14 
15     :param location: the location the response should redirect to.    
16     :param code: the redirect status code. defaults to 302.
17     :param class Response: a Response class to use when instantiating a
18         response. The default is :class:`werkzeug.wrappers.Response` if
19         unspecified.
20     """
21     if Response is None:
22         from werkzeug.wrappers import Response
23 
24     display_location = escape(location)
25     if isinstance(location, text_type):
26         # Safe conversion is necessary here as we might redirect
27         # to a broken URI scheme (for instance itms-services).
28         from werkzeug.urls import iri_to_uri
29         location = iri_to_uri(location, safe_conversion=True)
30     response = Response(
31         '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
32         '<title>Redirecting...</title>\n'
33         '<h1>Redirecting...</h1>\n'
34         '<p>You should be redirected automatically to target URL: '
35         '<a href="%s">%s</a>.  If not click the link.' %
36         (escape(location), display_location), code, mimetype='text/html')
37     response.headers['Location'] = location
38     return response

源码的解释很清楚,redirect就是一个响应,它总共有三个参数,这三个参数都是用来实例化响应的.

第一个参数:location是响应应该重定向到的位置。第二个参数code是重定向状态代码,,最后一个参数是实例化响应时要使用的响应类.

所以说redirect本身是不能像render_template那样来传递参数的.

但是!!

如果你要传递的参数只是像string,int这样的数据,你可以用url_for来作为location参数,而url_for是可以做到传递这些简单数据的.

redirect(url_for())传递参数的方法如下:

@app.route('/login/',methods=['GET','POST'])
def user_login():
    username = 'unsprint'
    return redirect(url_for('index',username=username))  #url_for在index的路由和username之间加一个?进行拼接,使得username成为一个可接受的参数
 
#通过路由接收参数                 
@app.route('/index/?<string:username>')  #这里指定了接收的username的类型,如果不符合会报错,
def index(username):                     #可以将string改成path, 这样username就会被当成路径来接收,也就是说username可以是任意可键入路由的值了

    return username

flask的重定向(redirect)传递参数的方法

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