写一个一个能进行登录、注册、留言的简易网站包括代码

好的，这里提供一个使用 Flask 框架、SQLite 数据库和 Bootstrap 前端框架的简易网站的代码，实现了登录、注册和留言功能。注意，这只是一个简单的示例代码，没有进行安全性和性能方面的优化，请不要直接用于生产环境。首先需要安装 Flask 和 Flask-WTF 模块，可以使用 pip 命令进行安装： ``` pip install Flask Flask-WTF ``` 以下为代码： ``` # app.py from flask import Flask, render_template, redirect, url_for, flash from flask_wtf import FlaskForm from wtforms import StringField, PasswordField, SubmitField, TextAreaField from wtforms.validators import DataRequired, Email, EqualTo from flask_sqlalchemy import SQLAlchemy from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user from datetime import datetime app = Flask(__name__) app.config['SECRET_KEY'] = 'secret_key' app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db' db = SQLAlchemy(app) login_manager = LoginManager(app) login_manager.login_view = 'login' class User(UserMixin, db.Model): id = db.Column(db.Integer, primary_key=True) email = db.Column(db.String(120), unique=True, nullable=False) password = db.Column(db.String(60), nullable=False) messages = db.relationship('Message', backref='author', lazy=True) class Message(db.Model): id = db.Column(db.Integer, primary_key=True) content = db.Column(db.Text, nullable=False) date_posted = db.Column(db.DateTime, nullable=False, default=datetime.utcnow) user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False) class RegistrationForm(FlaskForm): email = StringField('Email', validators=[DataRequired(), Email()]) password = PasswordField('Password', validators=[DataRequired()]) confirm_password = PasswordField('Confirm Password', validators=[DataRequired(), EqualTo('password')]) submit = SubmitField('Sign Up') def validate_email(self, email): user = User.query.filter_by(email=email.data).first() if user: raise ValidationError('Email already exists.') class LoginForm(FlaskForm): email = StringField('Email', validators=[DataRequired(), Email()]) password = PasswordField('Password', validators=[DataRequired()]) submit = SubmitField('Login') class MessageForm(FlaskForm): content = TextAreaField('Message', validators=[DataRequired()]) submit = SubmitField('Post') @login_manager.user_loader def load_user(user_id): return User.query.get(int(user_id)) @app.route('/') def home(): messages = Message.query.order_by(Message.date_posted.desc()).all() return render_template('home.html', messages=messages) @app.route('/register', methods=['GET', 'POST']) def register(): form = RegistrationForm() if form.validate_on_submit(): user = User(email=form.email.data, password=form.password.data) db.session.add(user) db.session.commit() flash('Account created, you can now log in.', 'success') return redirect(url_for('login')) return render_template('register.html', form=form) @app.route('/login', methods=['GET', 'POST']) def login(): form = LoginForm() if form.validate_on_submit(): user = User.query.filter_by(email=form.email.data).first() if user and user.password == form.password.data: login_user(user) flash('Logged in successfully.', 'success') return redirect(url_for('home')) else: flash('Invalid email or password.', 'error') return render_template('login.html', form=form) @app.route('/logout') @login_required def logout(): logout_user() return redirect(url_for('home')) @app.route('/message', methods=['GET', 'POST']) @login_required def message(): form = MessageForm() if form.validate_on_submit(): message = Message(content=form.content.data, author=current_user) db.session.add(message) db.session.commit() flash('Message posted.', 'success') return redirect(url_for('home')) return render_template('message.html', form=form) if __name__ == '__main__': app.run(debug=True) ``` 然后创建以下模板文件： ``` # templates/base.html <!doctype html> <html> <head> <title>{% block title %}My Website{% endblock %}</title>  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"> </head> <body> <nav class="navbar navbar-expand-lg navbar-light bg-light"> <div class="container"> <a class="navbar-brand" href="{{ url_for('home') }}">My Website</a> {% if current_user.is_authenticated %} <ul class="navbar-nav ml-auto"> <li class="nav-item"> <a class="nav-link" href="{{ url_for('message') }}">Post Message</a> </li> <li class="nav-item"> <a class="nav-link" href="{{ url_for('logout') }}">Logout</a> </li> </ul> {% else %} <ul class="navbar-nav ml-auto"> <li class="nav-item"> <a class="nav-link" href="{{ url_for('login') }}">Login</a> </li> <li class="nav-item"> <a class="nav-link" href="{{ url_for('register') }}">Sign Up</a> </li> </ul> {% endif %} </div> </nav> <div class="container mt-5"> {% with messages = get_flashed_messages() %} {% if messages %} {% for message in messages %} <div class="alert alert-{{ message[1] }} alert-dismissible fade show" role="alert"> {{ message[0] }} <button type="button" class="close" data-dismiss="alert" aria-label="Close"> <span aria-hidden="true">×</span> </button> </div> {% endfor %} {% endif %} {% endwith %} {% block content %}{% endblock %} </div>  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script> </body> </html> ``` ``` # templates/home.html {% extends 'base.html' %} {% block content %} {% for message in messages %} <div class="card mb-3"> <div class="card-body"> <p class="card-text">{{ message.content }}</p> <p class="card-subtitle text-muted">{{ message.author.email }} - {{ message.date_posted.strftime('%Y-%m-%d %H:%M:%S') }}</p> </div> </div> {% endfor %} {% endblock %} ``` ``` # templates/register.html {% extends 'base.html' %} {% block title %}Sign Up{% endblock %} {% block content %} <h1>Sign Up</h1> <form method="POST" action=""> {{ form.hidden_tag() }} <div class="form-group"> {{ form.email.label }} {{ form.email }} {% for error in form.email.errors %} <div class="invalid-feedback">{{ error }}</div> {% endfor %} </div> <div class="form-group"> {{ form.password.label }} {{ form.password }} {% for error in form.password.errors %} <div class="invalid-feedback">{{ error }}</div> {% endfor %} </div> <div class="form-group"> {{ form.confirm_password.label }} {{ form.confirm_password }} {% for error in form.confirm_password.errors %} <div class="invalid-feedback">{{ error }}</div> {% endfor %} </div> <button type="submit" class="btn btn-primary">Sign Up</button> </form> {% endblock %} ``` ``` # templates/login.html {% extends 'base.html' %} {% block title %}Login{% endblock %} {% block content %} <h1>Login</h1> <form method="POST" action=""> {{ form.hidden_tag() }} <div class="form-group"> {{ form.email.label }} {{ form.email }} {% for error in form.email.errors %} <div class="invalid-feedback">{{ error }}</div> {% endfor %} </div> <div class="form-group"> {{ form.password.label }} {{ form.password }} {% for error in form.password.errors %} <div class="invalid-feedback">{{ error }}</div> {% endfor %} </div> <button type="submit" class="btn btn-primary">Login</button> </form> {% endblock %} ``` ``` # templates/message.html {% extends 'base.html' %} {% block title %}Post Message{% endblock %} {% block content %} <h1>Post Message</h1> <form method="POST" action=""> {{ form.hidden_tag() }} <div class="form-group"> {{ form.content.label }} {{ form.content }} {% for error in form.content.errors %} <div class="invalid-feedback">{{ error }}</div> {% endfor %} </div> <button type="submit" class="btn btn-primary">Post</button> </form> {% endblock %} ``` 以上代码实现了一个简单的登录、注册、留言功能的网站，您可以根据自己的需求进行修改和优化。

写一个一个能进行登录、注册、留言的简易网站包括代码

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