Flask Web Application
Flask Web Application代码
安装flask环境
pip install flask
pip install flask-login
pip install flask-sqlalchemy
创建项目总文件夹flask web application
子文件夹website
-
子文件夹static
- 配置index.js
function deleteNote(noteId) {
fetch("/delete-note", {
method: "POST",
body: JSON.stringify({ noteId: noteId }),
}).then((_res) => {
window.location.href = "/";
});
}
-
子文件夹templates
- 配置base.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="stylesheet"
href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh"
crossorigin="anonymous"
/>
<link
rel="stylesheet"
href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"
crossorigin="anonymous"
/>
<title>{% block title %}主页{% endblock %}</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<button
class="navbar-toggler"
type="button"
data-toggle="collapse"
data-target="#navbar"
>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbar">
<div class="navbar-nav">
{% if user.is_authenticated %}
<a class="nav-item nav-link" id="home" href="/">主页</a>
<a class="nav-item nav-link" id="logout" href="/logout">登出</a>
{% else %}
<a class="nav-item nav-link" id="login" href="/login">登入</a>
<a class="nav-item nav-link" id="signUp" href="/sign-up">注册</a>
{% endif %}
</div>
</div>
</nav>
{% with messages = get_flashed_messages(with_categories=true) %} {% if
messages %} {% for category, message in messages %} {% if category ==
'错误' %}
<div class="alert alert-danger alter-dismissable fade show" role="alert">
{{ message }}
<button type="button" class="close" data-dismiss="alert">
<span aria-hidden="true">×</span>
</button>
</div>
{% else %}
<div class="alert alert-success alter-dismissable fade show" role="alert">
{{ message }}
<button type="button" class="close" data-dismiss="alert">
<span aria-hidden="true">×</span>
</button>
</div>
{% endif %} {% endfor %} {% endif %} {% endwith %}
<div class="container">{% block content %} {% endblock %}</div>
<script
src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"
></script>
<script
src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"
></script>
<script
src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"
></script>
<script
type="text/javascript"
src="{{ url_for('static', filename='index.js') }}"
></script>
</body>
</html>
- 配置home.html
{% extends "base.html" %} {% block title %}主页{% endblock %} {% block content
%}
<!DOCTYPE html>
<html>
<body>
<h1 align="center">记录内容</h1>
<center><img src='https://c-ssl.duitang.com/uploads/item/201501/20/20150120150852_fjASC.thumb.1000_0.jpeg'></center>
<ul class="list-group list-group-flush" id="notes">
{% for note in user.notes %}
<li class="list-group-item">
{{ note.data }}
<button type="button" class="close" onClick="deleteNote({{ note.id }})">
<span aria-hidden="true">×</span>
</button>
</li>
{% endfor %}
</ul>
<form method="POST">
<textarea name="note" id="note" class="form-control"></textarea>
<br />
<div align="center">
<button type="submit" class="btn btn-primary">添加记录</button>
</div>
</form>
</body>
</html>
{% endblock %}
- 配置login.html
{% extends "base.html" %} {% block title %}登入{% endblock %} {% block content
%}
<form method="POST">
<h3 align="center">登入</h3>
<div class="form-group">
<label for="email">邮箱</label>
<input
type="email"
class="form-control"
id="email"
name="email"
placeholder="输入邮箱地址"
/>
</div>
<div class="form-group">
<label for="password">密码</label>
<input
type="password"
class="form-control"
id="password"
name="password"
placeholder="输入密码"
/>
</div>
<br />
<button type="submit" class="btn btn-primary">提交</button>
</form>
{% endblock %}
- 配置sign_up.html
{% extends "base.html" %} {% block title %}注册{% endblock %} {% block
content %}
<form method="POST">
<h3 align="center">注册</h3>
<div class="form-group">
<label for="email">邮箱</label>
<input
type="email"
class="form-control"
id="email"
name="email"
placeholder="输入邮箱地址"
/>
</div>
<div class="form-group">
<label for="firstName">姓名</label>
<input
type="text"
class="form-control"
id="firstName"
name="firstName"
placeholder="输入姓名"
/>
</div>
<div class="form-group">
<label for="password1">密码</label>
<input
type="password"
class="form-control"
id="password1"
name="password1"
placeholder="输入密码"
/>
</div>
<div class="form-group">
<label for="password2">确认密码</label>
<input
type="password"
class="form-control"
id="password2"
name="password2"
placeholder="确认密码"
/>
</div>
<br />
<button type="submit" class="btn btn-primary">提交</button>
</form>
{% endblock %}
-
子文件init.py
- 配置init.py
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from os import path
from flask_login import LoginManager
db = SQLAlchemy()
DB_NAME = "database.db"
def create_app():
app = Flask(__name__)
app.config['SECRET_KEY'] = 'become a developer'
app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{DB_NAME}'
db.init_app(app)
from .views import views
from .author import author
app.register_blueprint(views, url_prefix='/')
app.register_blueprint(author, url_prefix='/')
from .models import User, Note
create_database(app)
login_manager = LoginManager()
login_manager.login_view = 'author.login'
login_manager.init_app(app)
@login_manager.user_loader
def load_user(id):
return User.query.get(int(id))
return app
def create_database(app):
if not path.exists('website/' + DB_NAME):
db.create_all(app=app)
print('成功创建数据库！')
-
子文件author.py
- 配置author.py
from flask import Blueprint, render_template, request, flash, redirect, url_for
from .models import User
from werkzeug.security import generate_password_hash, check_password_hash
from . import db
from flask_login import login_user, login_required, logout_user, current_user
author = Blueprint('author', __name__)
@author.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
email = request.form.get('email')
password = request.form.get('password')
user = User.query.filter_by(email=email).first()
if user:
if check_password_hash(user.password, password):
flash('登录成功！', category='成功')
login_user(user, remember=True)
return redirect(url_for('views.home'))
else:
flash('密码错误，请重试！', category='错误')
else:
flash('邮箱不存在！', category='错误')
return render_template("login.html", user=current_user)
@author.route('/logout')
@login_required
def logout():
logout_user()
return redirect(url_for('author.login'))
@author.route('/sign-up', methods=['GET', 'POST'])
def sign_up():
if request.method == 'POST':
email = request.form.get('email')
first_name = request.form.get('firstName')
password1 = request.form.get('password1')
password2 = request.form.get('password2')
user = User.query.filter_by(email=email).first()
if user:
flash('邮箱已存在', category='错误')
elif len(email) < 4:
flash('邮箱至少包含3个字符.', category='错误')
elif len(first_name) < 2:
flash('请输入您的姓名(至少包含1个字符)', category='错误')
elif password1 != password2:
flash('密码不匹配', category='错误')
elif len(password1) < 7:
flash('请输入至少7位以上的密码.', category='错误')
else:
new_user = User(email=email, first_name=first_name, password=generate_password_hash(
password1, method='sha256'))
db.session.add(new_user)
db.session.commit()
login_user(new_user, remember=True)
flash('成功创建账户!', category='成功')
return redirect(url_for('views.home'))
return render_template("sign_up.html", user=current_user)
-
子文件models.py
- 配置models.py
from . import db
from flask_login import UserMixin
from sqlalchemy.sql import func
class Note(db.Model):
id = db.Column(db.Integer, primary_key=True)
data = db.Column(db.String(10000))
date = db.Column(db.DateTime(timezone=True), default=func.now())
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(150), unique=True)
password = db.Column(db.String(150))
first_name = db.Column(db.String(150))
notes = db.relationship('Note')
-
子文件views.py
- 配置views.py
from flask import Blueprint, render_template, request, flash, jsonify
from flask_login import login_required, current_user
from .models import Note
from . import db
import json
views = Blueprint('views', __name__)
@views.route('/', methods=['GET', 'POST'])
@login_required
def home():
if request.method == 'POST':
note = request.form.get('note')
if len(note) < 1:
flash('请输入内容!', category='错误')
else:
new_note = Note(data=note, user_id=current_user.id)
db.session.add(new_note)
db.session.commit()
flash('成功添加记录!', category='成功')
return render_template("home.html", user=current_user)
@views.route('/delete-note', methods=['POST'])
def delete_note():
note = json.loads(request.data)
noteId = note['noteId']
note = Note.query.get(noteId)
if note:
if note.user_id == current_user.id:
db.session.delete(note)
db.session.commit()
return jsonify({})
- 子文件main.py
-
配置main.py
from website import create_app app = create_app() if __name__=='__main__': app.run(debug=True)
-
运行 python main.py
run_main
访问127.0.0.1:5000
页面展示
login
sign_up
home
