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2021
07-01

Flask登录注册项目的简单实现

本文主要介绍了Flask登录注册项目的简单实现，分享给大家，具体如下：

目录结构

在这里插入图片描述

配置文件设计
/templates/config.py

#数据库连接配置
import pymysql

conn = pymysql.connect(
        host='192.XXX.XXX.XX',
        port=320xx,
        user='root',
        password='123456',
        database='test_XX'
    )

首页/templates/index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
{#    <link rel=stylesheet type=text/css href="{{ url_for('static', filename='style.css') }}" rel="external nofollow"  rel="external nofollow" >#}
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet"  type="text/css" href="/static/style.css" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >
    <title>林家小猪测试小站</title>
</head>
<body>
    <div>
    <h1>您好，{{ username }}，欢迎来到我的小站</h1>
        <a href="{{ url_for('user_login') }}" rel="external nofollow"  rel="external nofollow" >退出</a>
        <br/>
    </div>
</body>
</html>

登录页面/templates/login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet"  type="text/css" href="/static/style.css" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >
{#    <link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}" rel="external nofollow"  rel="external nofollow"  type="text/css">#}
    <title>登录</title>
</head>
<body>
    <div>
    <h1>用户登录</h1>
    <!--将登陆信息放到一个form中-->
    <form method="POST">
        <input type="text" name="username" placeholder="请输入用户名" />
        <br/>
        <input type="password" name="password" placeholder="请输入密码（小于12位）" />
        <br/>
         <!--jinja2的函数-->
        {% if message %} {{message}} {% endif %}
        <br/>
        <input type="submit" value="登录" />
        <input type="reset" value="重置" />
        <!--跳转到register的页面-->
        <a href="{{ url_for('register') }}" rel="external nofollow" >注册</a>
    </form>
    </div>
</body>
</html>

注册页面/templates/register.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet"  type="text/css" href="/static/style.css" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >
    <title>注册</title>
</head>
<body>
    <div>
    <h1>用户注册</h1>
    <form method="POST">
        <input type="text" name="username" placeholder="请输入用户名" />
        <br/>
        <input type="password" name="password" placeholder="请输入密码（小于12位）" />
        <br/>
        <!--jinja2的函数-->
        {% if message %} {{message}} {% endif %}
        <br/>
        <input type="submit" value="注册" />
        <input type="reset" value="重置" />
        <a href="{{ url_for('user_login') }}" rel="external nofollow"  rel="external nofollow" >登录</a>
    </form>
    </div>
</body>
</html>

登录校验 /model/check_login.py

from templates.config import conn
cur = conn.cursor()
def is_null(username,password):
	if(username==''or password==''):
		return True
	else:
		return False


def is_existed(username,password):
	sql="SELECT * FROM user WHERE username ='%s' and password ='%s'" %(username,password)
	cur.execute(sql)
	result = cur.fetchall()
	if (len(result) == 0):
		return False
	else:
		return True

def exist_user(username):
	sql = "SELECT * FROM user WHERE username ='%s'" % (username)
	cur.execute(sql)
	result = cur.fetchall()
	if (len(result) == 0):
		return False
	else:
		return True

注册校验 /model/regist_login.py

from templates.config import conn

cur = conn.cursor()

def add_user(username, password):
    # sql commands
    sql = "INSERT INTO user(username, password) VALUES ('%s','%s')" %(username, password)
    # execute(sql)
    cur.execute(sql)
    # commit
    conn.commit()  # 对数据库内容有改变，需要commit()
    conn.close()

最后编辑运行文件
app.py

from flask import Flask,render_template
from flask import redirect
from flask import url_for
from flask import request
from model.check_login import is_existed,exist_user,is_null
from model.check_regist import add_user

app = Flask(__name__)

@app.route('/')
def index():
    return redirect( url_for('user_login') )

@app.route('/user_login',methods=['GET','POST'])
def user_login():
    if request.method=='POST':  # 注册发送的请求为POST请求
        username = request.form['username']
        password = request.form['password']
        if is_null(username,password):
            login_massage = "温馨提示：账号和密码是必填"
            return render_template('login.html', message=login_massage)
        elif is_existed(username, password):
            return render_template('index.html', username=username)
        elif exist_user(username):
            login_massage = "提示：密码错误，请输入正确密码"
            return render_template('login.html', message=login_massage)
        else:
            login_massage = "不存在该用户"
            return render_template('login.html', message=login_massage)
    return render_template('login.html')

@app.route("/regiser",methods=["GET", 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        if is_null(username,password):
            login_massage = "温馨提示：账号和密码是必填"
            return render_template('register.html', message=login_massage)
        elif exist_user(username):
            return redirect(url_for('user_login'))
        else:
            add_user(request.form['username'], request.form['password'] )
            return render_template('index.html', username=username)
    return render_template('register.html')



if __name__=="__main__":
    app.run()

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