Flask之 路由（routing）

# -*- coding:utf-8 -*-
from flask import Flask

#创建一个flask应用对象
app = Flask(__name__)
app.debug = True

#使用 route()装饰器告诉flask哪个url触发哪个函数
@app.route(‘/‘)
def hello_world():
    return ‘Index page‘

#route()装饰器绑定了一个函数hello()到一个URL "/hello"
@app.route(‘/hello‘)
def hello():
    return ‘Hello world‘

if __name__ == ‘__main__‘:
    app.run()

静态文件:

Static Files

Dynamic web applications also need static files. That’s usually where the CSS and JavaScript files are coming from. Ideally your web server is configured to serve them for you, but during development Flask can do that as well. Just create a folder called static in your package or next to your module and it will be available at /static on the application.

To generate URLs for static files, use the special ‘static‘ endpoint name:

url_for(‘static‘, filename=‘style.css‘)

The file has to be stored on the filesystem as static/style.css.

变量规则:

我们可以通过<variable_name>来在我们的url上添加一个变量。比如我们的函数的变量，我们也可以使用转换器来要我们指定的类型值<converter:variable_name>，例如<int:post_id>

# 这里我们接受一个username变量，http://127.0.0.1:5000/user/xxx
@app.route(‘/user/<username>‘)
def show_user_profile(username):
    #显示指定用户的信息
    return ‘User %s‘ % username

# http://127.0.0.1:5000/post/xx(为int的数字)
@app.route(‘/post/<int:post_id>‘)
def show_post(post_id):
    #显示指定id的文章内容
    return ‘Post %d‘ % post_id

The following converters exist:

Url小提示：

版本一
#route()装饰器绑定了另外一个URL
@app.route(‘/hello‘)
def hello():
    return ‘Hello world‘
#当我们访问http://127.0.0.1:5000/hello/会出错

#版本二
#route()装饰器绑定了另外一个URL
@app.route(‘/hello/‘)
def hello():
    return ‘Hello world‘
#当我们访问http://127.0.0.1:5000/hello 会转到 http://127.0.0.1:5000/hello/

HTTP方法

from flask import Flask, request

app = Flask(__name__)
app.debug=True

@app.route(‘/login‘, methods=[‘GET‘, ‘POST‘])
def login():
    if request.method == ‘GET‘:
        return ‘GET‘
    else:
        return ‘POST‘