Flask 简单实现注册登陆

注册登录是web交互最基本的功能，简单介绍下最最基本的注册登录，后面会不断补充完善。

这个功能确实很简单，但一定不能眼高手低。当你真正动手去写的时候会发现很多问题。下面列一下需要注意的点:

数据库路径, 我是Linux下的sqlite3，有三个 /
数据库类怎么定义
路由和 HTTP 请求
db.create_all()

代码实现

#-*-coding:utf-8 -*-
from flask import Flask, url_for, render_template,redirect, request, flash, session
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
db = SQLAlchemy(app)

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.sqlite3'
app.config['SECRET_KEY'] = 'random string'

class users(db.Model):
    id = db.Column('user_id',db.Integer,primary_key=True)
    name = db.Column(db.String(100))
    password = db.Column(db.String(100))

    def __init__(self, name, password):
        self.name = name
        self.password = password

@app.route('/', methods=['GET', 'POST'])
@app.route('/login', methods=['GET','POST'])
def login():

    if request.method == 'GET':
        return render_template('login.html')
    else:
        user = users.query.filter(users.name == request.form['name']).first()
        if user:
            if request.form['password'] == user.password:
                return render_template('success.html',name=request.form['name'])
            else:
                return '密码错误'
                return render_template('login.html')
        else:
            return '该用户未注册'
            return render_template('login.html')


@app.route('/regist', methods=['GET','POST'])
def regist():
    if request.method == 'GET':
        return render_template('regist.html')
    else:
        if not request.form['name'] or not request.form['password']:
            return '不能为空 '
        else:
            user = users(request.form['name'], request.form['password'])
            db.session.add(user)
            db.session.commit()
            return 'successfully!'
            return redirect(url_for('login'))


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

# login.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Log in</title>
</head>
<body>
<h1>Login</h1>
<form action="" method="post">
    <label for="name">name</label><br>
    <input type="text" name="name" placeholder="username"><br>
    <label for="password">password</label><br>
    <input type="password" name="password"><br>
    <input type="submit" value="login">
</form>
<h3><a href="{{ url_for('regist') }}">Regist</a></h3>
</body>
</html>

# regist.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Regist</title>
</head>
<body>
<h1>Regist</h1>
<form action="" method="post">
    <label for="name">name</label><br>
    <input type="text" name="name" placeholder="username"><br>
    <label for="password">password</label><br>
    <input type="password" name="password"><br>
    <input type="submit" value="Regist">
</form>
</body>
</html>

# success.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Success</title>
</head>
<body>
<h1>Successful, {{ name }}</h1>
</body>
</html>