Python：flask_session 库高级用法举例和应用详解

from flask import Flask, session, redirect, url_for, request
from flask_session import Session  # 导入flask_session模块

app = Flask(__name__)  
app.config['SECRET_KEY'] = 'your_secret_key'  # 设置密钥，确保session安全
app.config['SESSION_TYPE'] = 'filesystem'  # 使用文件系统存储session
Session(app)  # 初始化Session扩展

@app.route('/login', methods=['POST'])
def login():
    username = request.form['username']  # 获取用户名
    session['username'] = username  # 将用户名存储在session中
    return redirect(url_for('profile'))  # 登录成功重定向到用户档案页面

@app.route('/profile')
def profile():
    if 'username' in session:  # 检查用户是否已登录
        return f"Welcome {session['username']}!"  # 返回欢迎信息
    return redirect(url_for('login'))  # 未登录跳转到登录页面

if __name__ == "__main__":
    app.run(debug=True)  # 运行Flask应用

from flask import Flask, session, request, jsonify
from flask_session import Session  # 导入flask_session模块

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'
app.config['SESSION_TYPE'] = 'filesystem'
Session(app)

@app.route('/add_to_cart/<item>', methods=['POST'])  # 添加商品到购物车
def add_to_cart(item):
    if 'cart' not in session:  # 检查是否已经创建购物车
        session['cart'] = []  # 创建购物车列表
    session['cart'].append(item)  # 将商品添加到购物车中
    return jsonify(session['cart'])  # 返回当前购物车内容

@app.route('/view_cart')  # 查看购物车商品
def view_cart():
    return jsonify(session.get('cart', []))  # 返回购物车内容，如果为空返回空列表

if __name__ == "__main__":
    app.run(debug=True)  # 运行Flask应用

from flask import Flask, session
from flask_session import Session  # 导入flask_session模块

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'
app.config['SESSION_TYPE'] = 'filesystem'
Session(app)

@app.route('/set_preference/<key>/<value>', methods=['POST'])  # 设置用户偏好
def set_preference(key, value):
    session[key] = value  # 存储用户偏好设置
    return f'Preference {key} set to {value}'

@app.route('/get_preference/<key>')  # 获取用户偏好
def get_preference(key):
    value = session.get(key, 'Not set')  # 获取用户偏好设置，如果未设置返回默认值
    return f'Preference {key} is {value}'

if __name__ == "__main__":
    app.run(debug=True)  # 运行Flask应用