Python 在我登录我的flask应用程序后,如何显示注销而不是登录/注册?
我用flask和Jinja模板创建了一个网站。我已经创建了一个登录和注册表单。在我的主页的标题中,有注册和登录。登录后,我想用注销替换登录/注册。如果有什么解决办法,告诉我。这将非常有帮助。提前谢谢。代码如下所示 index.htmlPython 在我登录我的flask应用程序后,如何显示注销而不是登录/注册?,python,flask,login,jinja2,Python,Flask,Login,Jinja2,我用flask和Jinja模板创建了一个网站。我已经创建了一个登录和注册表单。在我的主页的标题中,有注册和登录。登录后,我想用注销替换登录/注册。如果有什么解决办法,告诉我。这将非常有帮助。提前谢谢。代码如下所示 index.html <nav class="navbar navbar-inverse navbar-fixed-top" style="background-color: white; border-bottom: #dddddd solid 1px;border
<nav class="navbar navbar-inverse navbar-fixed-top" style="background-color:
white; border-bottom: #dddddd solid 1px;border-top: none;border-left: none;border-right: none;">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#" style="padding: 10px 20px;margin: 20px 0;">WebSiteName</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<!--ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#"></a></li>
<li><a href="#">Page 2</a></li>
<li><a href="#">Page 3</a></li>
</ul-->
<ul class="nav navbar-nav navbar-right ul1">
<li class="li1"><a id="a1" style="color: red;" href="{{ url_for('index') }}">Home</a></li>
<li class="li1"><a id="a1" href="{{ url_for('.index', _anchor='about') }}">About Product</a></li>
<li class="li1"><a id="a1" href="{{ url_for('.index', _anchor='foot') }}">Contact Us</a></li>
{% if is_authenticated == 'true' %}
<li class="li1"><a id="a1" href="{{ url_for('logout') }}">Logout</a></li>
{% else %}
<li class="li1"><a id="a1" href="{{ url_for('signup') }}">Signup</a></li>
<li class="li1"><a id="a1" href="{{ url_for('login') }}">Login</a></li>
{% endif %}
<!--li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li-->
</ul>
</div>
</div>
</nav>
{%if_经过身份验证=='true%}
{%else%}
{%endif%}
app.py
from flask import Flask, render_template, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField
from wtforms.validators import InputRequired, Email, Length
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
app = Flask(__name__)
app.config['SECRET_KEY'] = 'Thisissupposedtobesecret!'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
Bootstrap(app)
db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(15), unique=True)
email = db.Column(db.String(50), unique=True)
password = db.Column(db.String(80))
def is_authenticated(self):
"""Return True if the user is authenticated."""
return self.authenticated
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
class LoginForm(FlaskForm):
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
remember = BooleanField('Remember me')
class RegisterForm(FlaskForm):
email = StringField('Email', validators=[InputRequired(), Email(message='Invalid email'), Length(max=50)])
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
@app.route('/')
def index():
return render_template('index.html')
@app.route('/login', methods=['GET', 'POST'])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if check_password_hash(user.password, form.password.data):
login_user(user, remember=form.remember.data)
return redirect(url_for('dashboard'))
return '<h1>Invalid username or password</h1>'
#return '<h1>' + form.username.data + ' ' + form.password.data + '</h1>'
return render_template('login.html', form=form)
@app.route('/signup', methods=['GET', 'POST'])
def signup():
form = RegisterForm()
if form.validate_on_submit():
hashed_password = generate_password_hash(form.password.data, method='sha256')
new_user = User(username=form.username.data, email=form.email.data, password=hashed_password)
db.session.add(new_user)
db.session.commit()
flash('User successfully registered')
return redirect(url_for('login'))
#return '<h1>' + form.username.data + ' ' + form.email.data + ' ' + form.password.data + '</h1>'
return render_template('signup.html', form=form)
@app.route('/dashboard')
@login_required
def dashboard():
return render_template('dashboard.html', name=current_user.username)
@app.route('/logout')
@login_required
def logout():
logout_user()
return redirect(url_for('index'))
if __name__ == '__main__':
app.run(debug=True)
from flask import Flask, request, render_template, session
.....
@app.route('/login', methods=['POST', 'GET'])
def login():
error = None
if request.method == 'POST':
if valid_login(request.form['username'],request.form['password']):
session['logged_in'] = True
return render_template('index.html')
else:
error = 'Invalid username or password'
return render_template('login.html', error=error)
@app.route("/logout")
def logout():
session['logged_in'] = False
return render_template('login.html')
......
从烧瓶导入烧瓶,呈现模板,重定向,url,flash
从flask_引导导入引导
来自flask_wtf进口FlaskForm
从wtforms导入StringField、PasswordField、BooleanField
从wtforms.validators导入所需的输入、电子邮件、长度
从flask_sqlalchemy导入sqlalchemy
从werkzeug.security导入生成密码散列,检查密码散列
从flask_login导入LoginManager、UserMixin、login_用户、login_required、logout_用户、current_用户
app=烧瓶(名称)
app.config['SECRET\u KEY']=“ThisIssuppedTobeSecret!”
app.config['SQLALCHEMY\u DATABASE\u URI']='sqlite:///database.db'
引导(应用程序)
db=SQLAlchemy(应用程序)
login\u manager=LoginManager()
登录管理器。初始化应用程序(应用程序)
login\u manager.login\u视图='login'
类用户(UserMixin,db.Model):
id=db.Column(db.Integer,主键=True)
username=db.Column(db.String(15),unique=True)
email=db.Column(db.String(50),unique=True)
密码=db.Column(db.String(80))
def已通过身份验证(自身):
“”“如果用户经过身份验证,则返回True。”“”
返回自我验证
@登录\u manager.user\u加载程序
def加载用户(用户id):
返回User.query.get(int(User\u id))
类别登录表单(烧瓶表单):
username=StringField('username',验证器=[InputRequested(),长度(最小值=4,最大值=15)])
password=PasswordField('password',验证器=[InputRequested(),长度(最小值=8,最大值=80)])
记住=布尔菲尔德(“记住我”)
注册等级(烧瓶形式):
email=StringField('email',验证器=[InputRequested(),email(message='Invalid email'),长度(max=50)])
username=StringField('username',验证器=[InputRequested(),长度(最小值=4,最大值=15)])
password=PasswordField('password',验证器=[InputRequested(),长度(最小值=8,最大值=80)])
@应用程序路径(“/”)
def index():
返回渲染模板('index.html')
@app.route('/login',methods=['GET','POST'])
def login():
form=LoginForm()
if form.validate_on_submit():
user=user.query.filter\u by(username=form.username.data).first()
如果用户:
如果检查\u密码\u散列(user.password、form.password.data):
login\u user(user,memory=form.memory.data)
返回重定向(“仪表板”)的url\u
返回“无效的用户名或密码”
#返回“”+form.username.data+“”+form.password.data+“”
返回呈现模板('login.html',form=form)
@app.route('/signup',methods=['GET','POST'])
def signup():
form=RegisterForm()
if form.validate_on_submit():
hashed_password=generate_password_hash(form.password.data,method='sha256')
新用户=用户(用户名=form.username.data,电子邮件=form.email.data,密码=哈希密码)
db.session.add(新用户)
db.session.commit()
flash('用户已成功注册')
返回重定向(url_用于('login'))
#返回“”+form.username.data+“”+form.email.data+“”+form.password.data+“”
返回呈现模板('signup.html',form=form)
@应用程序路径(“/dashboard”)
@需要登录
def仪表板():
返回呈现模板('dashboard.html',name=current\u user.username)
@app.route(“/logout”)
@需要登录
def注销():
注销用户()
返回重定向(url_for('index'))
如果uuuu name uuuuuu='\uuuuuuu main\uuuuuuu':
app.run(debug=True)
登录成功时设置会话变量,如果已设置,请检入模板。注销时,您可以将其设置为False
这与您的代码并不完全匹配,而只是可以修改应用的示例
app.py
from flask import Flask, render_template, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField
from wtforms.validators import InputRequired, Email, Length
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
app = Flask(__name__)
app.config['SECRET_KEY'] = 'Thisissupposedtobesecret!'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
Bootstrap(app)
db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(15), unique=True)
email = db.Column(db.String(50), unique=True)
password = db.Column(db.String(80))
def is_authenticated(self):
"""Return True if the user is authenticated."""
return self.authenticated
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
class LoginForm(FlaskForm):
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
remember = BooleanField('Remember me')
class RegisterForm(FlaskForm):
email = StringField('Email', validators=[InputRequired(), Email(message='Invalid email'), Length(max=50)])
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
@app.route('/')
def index():
return render_template('index.html')
@app.route('/login', methods=['GET', 'POST'])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if check_password_hash(user.password, form.password.data):
login_user(user, remember=form.remember.data)
return redirect(url_for('dashboard'))
return '<h1>Invalid username or password</h1>'
#return '<h1>' + form.username.data + ' ' + form.password.data + '</h1>'
return render_template('login.html', form=form)
@app.route('/signup', methods=['GET', 'POST'])
def signup():
form = RegisterForm()
if form.validate_on_submit():
hashed_password = generate_password_hash(form.password.data, method='sha256')
new_user = User(username=form.username.data, email=form.email.data, password=hashed_password)
db.session.add(new_user)
db.session.commit()
flash('User successfully registered')
return redirect(url_for('login'))
#return '<h1>' + form.username.data + ' ' + form.email.data + ' ' + form.password.data + '</h1>'
return render_template('signup.html', form=form)
@app.route('/dashboard')
@login_required
def dashboard():
return render_template('dashboard.html', name=current_user.username)
@app.route('/logout')
@login_required
def logout():
logout_user()
return redirect(url_for('index'))
if __name__ == '__main__':
app.run(debug=True)
from flask import Flask, request, render_template, session
.....
@app.route('/login', methods=['POST', 'GET'])
def login():
error = None
if request.method == 'POST':
if valid_login(request.form['username'],request.form['password']):
session['logged_in'] = True
return render_template('index.html')
else:
error = 'Invalid username or password'
return render_template('login.html', error=error)
@app.route("/logout")
def logout():
session['logged_in'] = False
return render_template('login.html')
......
在模板中
......
{% if session['logged_in'] %}
<!-- Logged in -->
{% else %}
<!-- Not Logged in -->
{% endif %}
........
。。。。。。
{%if会话['logged_in']%}
{%else%}
{%endif%}
........
登录成功时设置会话变量,如果已设置,请检入模板。注销时,您可以将其设置为False
这与您的代码并不完全匹配,而只是可以修改应用的示例
app.py
from flask import Flask, render_template, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField
from wtforms.validators import InputRequired, Email, Length
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
app = Flask(__name__)
app.config['SECRET_KEY'] = 'Thisissupposedtobesecret!'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
Bootstrap(app)
db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(15), unique=True)
email = db.Column(db.String(50), unique=True)
password = db.Column(db.String(80))
def is_authenticated(self):
"""Return True if the user is authenticated."""
return self.authenticated
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
class LoginForm(FlaskForm):
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
remember = BooleanField('Remember me')
class RegisterForm(FlaskForm):
email = StringField('Email', validators=[InputRequired(), Email(message='Invalid email'), Length(max=50)])
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
@app.route('/')
def index():
return render_template('index.html')
@app.route('/login', methods=['GET', 'POST'])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if check_password_hash(user.password, form.password.data):
login_user(user, remember=form.remember.data)
return redirect(url_for('dashboard'))
return '<h1>Invalid username or password</h1>'
#return '<h1>' + form.username.data + ' ' + form.password.data + '</h1>'
return render_template('login.html', form=form)
@app.route('/signup', methods=['GET', 'POST'])
def signup():
form = RegisterForm()
if form.validate_on_submit():
hashed_password = generate_password_hash(form.password.data, method='sha256')
new_user = User(username=form.username.data, email=form.email.data, password=hashed_password)
db.session.add(new_user)
db.session.commit()
flash('User successfully registered')
return redirect(url_for('login'))
#return '<h1>' + form.username.data + ' ' + form.email.data + ' ' + form.password.data + '</h1>'
return render_template('signup.html', form=form)
@app.route('/dashboard')
@login_required
def dashboard():
return render_template('dashboard.html', name=current_user.username)
@app.route('/logout')
@login_required
def logout():
logout_user()
return redirect(url_for('index'))
if __name__ == '__main__':
app.run(debug=True)
from flask import Flask, request, render_template, session
.....
@app.route('/login', methods=['POST', 'GET'])
def login():
error = None
if request.method == 'POST':
if valid_login(request.form['username'],request.form['password']):
session['logged_in'] = True
return render_template('index.html')
else:
error = 'Invalid username or password'
return render_template('login.html', error=error)
@app.route("/logout")
def logout():
session['logged_in'] = False
return render_template('login.html')
......
在模板中
......
{% if session['logged_in'] %}
<!-- Logged in -->
{% else %}
<!-- Not Logged in -->
{% endif %}
........
。。。。。。
{%if会话['logged_in']%}
{%else%}
{%endif%}
........
只需在模板中使用flask登录的内置当前用户,如下所示:
{% if current_user.is_authenticated %}
-- place logout button here --
{% else %}
-- place login button here --
{% endif %}
只需在模板中使用flask登录的内置当前用户,如下所示:
{% if current_user.is_authenticated %}
-- place logout button here --
{% else %}
-- place login button here --
{% endif %}