思路
通过登陆---登陆通过将用户名称写入session--每个网页访问先认证用户是否在session中
flask登陆首页
from flask import Flask, render_template, request, redirect, url_for, session
app = Flask(__name__)
app.secret_key = 'your_secret_key_here' # 设置秘密密钥以安全地处理会话
# 假设我们有一个简单的用户验证函数
def check_credentials(username, password):
# 这里只是一个简化的模拟，实际应用中应连接到数据库进行查询
if username == 'admin' and password == 'password':
return True
return False
@app.route('/')
def home():
if 'username' in session:
return "Welcome back, {}!".format(session['username'])
return "You are not logged in. Please go to the login page."
@app.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
username = request.form.get('username')
password = request.form.get('password')
if check_credentials(username, password):
session['username'] = username
return redirect(url_for('home'))
else:
error_message = "Invalid credentials. Please try again."
else:
error_message = None
return render_template('login.html', error=error_message)
@app.route('/logout')
def logout():
# 清除会话数据
session.pop('username', None)
return redirect(url_for('home'))
if __name__ == '__main__':
app.run(debug=True)
登陆的网页代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="{{ url_for('login') }}" method="post">
<label for="username">Username:</label>
<input type="text" id="username" name="username">
<label for="password">Password:</label>
<input type="password" id="password" name="password">
{% if error %}
<p>{{ error }}</p>
{% endif %}
<button type="submit">Login</button>
</form>
</body>
</html>