flask实现带有注册登录功能的管理系统

要实现一个带有注册登录功能的管理系统，可以使用 Flask 框架和 SQLAlchemy 库来实现。以下是一个简单的示例：

1. 安装 Flask 和 SQLAlchemy

pip install Flask SQLAlchemy

2. 创建 Flask 应用

from flask import Flask

app = Flask(__name__)

3. 配置数据库

from flask_sqlalchemy import SQLAlchemy

app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://username:password@localhost/db_name'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

db = SQLAlchemy(app)

4. 定义用户模型

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(50), unique=True, nullable=False)
    password = db.Column(db.String(100), nullable=False)

    def __repr__(self):
        return f'<User {self.username}>'

5. 创建数据库表

db.create_all()

6. 创建注册和登录路由

from flask import render_template, request, redirect, url_for, flash
from werkzeug.security import generate_password_hash, check_password_hash

@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        user = User.query.filter_by(username=username).first()

        if user:
            flash('Username already exists.')
            return redirect(url_for('register'))

        new_user = User(username=username, password=generate_password_hash(password, method='sha256'))
        db.session.add(new_user)
        db.session.commit()

        flash('Account created.')
        return redirect(url_for('login'))

    return render_template('register.html')


@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        remember = True if request.form.get('remember') else False

        user = User.query.filter_by(username=username).first()

        if not user or not check_password_hash(user.password, password):
            flash('Incorrect username or password.')
            return redirect(url_for('login'))

        session['user_id'] = user.id
        session['username'] = user.username
        flash('Logged in successfully.')
        return redirect(url_for('home'))

    return render_template('login.html')

7. 创建需要登录才能访问的路由

from flask_login import login_required

@app.route('/home')
@login_required
def home():
    return render_template('home.html')

8. 创建注销路由

from flask_login import logout_user

@app.route('/logout')
@login_required
def logout():
    logout_user()
    flash('Logged out successfully.')
    return redirect(url_for('login'))

9. 运行应用程序

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

以上是一个简单的示例，可以根据需要进行修改和扩展。同时，为了实现注册登录功能，我们还需要使用 Flask-Login 扩展来管理用户会话。