一、添加url方式
1、@app.route(‘xxx’)（实际route方法本质上还是调用了add_url_rule方法）
def route(self, rule, **options):
def decorator(f):
endpoint = options.pop('endpoint', None)
self.add_url_rule(rule, endpoint, f, **options)
return f
return decorator
2、app.add_url_rule(‘xxx’, view_func=demo)
def add_url_rule(self, rule, endpoint=None, view_func=None, **options):
"""Connects a URL rule. Works exactly like the :meth:`route`
decorator. If a view_func is provided it will be registered with the
endpoint.
"""
methods = options.pop('methods', None)
rule = self.url_rule_class(rule, methods=methods, **options)
self.url_map.add(rule)
if view_func is not None:
old_func = self.view_functions.get(endpoint)
if old_func is not None and old_func != view_func:
raise AssertionError('View function mapping is overwriting an '
'existing endpoint function: %s' % endpoint)
self.view_functions[endpoint] = view_func
二、原理
-
url和视图函数通过endpoint关联起来。url<---->endpoint<---->view_func；
-
url和endpoint的对应关系存入到url_map中；
-
以endpoint为key，view_function为值存入view_functions字典中。
-
添加url的两种方法都可以指定endpoint，如果endpoint未指定，会把视图函数的名称做为默认的endpoint的值。