Flask类视图的基本用法及高级技巧

from flask import Flask, render_template, request
from flask.views import MethodView

app = Flask(__name__)

class GreetingView(MethodView):
    
    def get(self):
        return "Hello, World!"

    def post(self):
        return "Greeting sent!"

# 注册视图
app.add_url_rule('/greet', view_func=GreetingView.as_view('greet'))

if __name__ == "__main__":
    app.run(debug=True)

class GreetingView(MethodView):

    def get(self, name=None):
        if name:
            return f"Hello, {name}!"
        return "Hello, World!"

app.add_url_rule('/greet/', defaults={'name': None}, view_func=GreetingView.as_view('greet'))
app.add_url_rule('/greet/<name>', view_func=GreetingView.as_view('greet_name'))

from functools import wraps

def log_access(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        print("Accessing the view...")
        return f(*args, **kwargs)
    return decorated_function

class GreetingView(MethodView):
    
    decorators = [log_access]
    
    def get(self, name=None):
        if name:
            return f"Hello, {name}!"
        return "Hello, World!"

class UserDashboard(MethodView):

    def get(self, user_id):
        # 假设我们从数据库或其他地方获取了用户信息
        user_info = get_user_info_from_id(user_id)
        return render_template('dashboard.html', user=user_info)

app.add_url_rule('/dashboard/<int:user_id>', view_func=UserDashboard.as_view('dashboard'))