这篇教程Python Flask基础到登录功能的实现代码写得很实用，希望能帮到您。
视频教程教学地址：https://www.bilibili.com/video/BV18441117Hd?p=1
0x01路由from flask import Flaskapp = Flask(__name__) # flask对象实例化 @app.route('/index') #定义首页@app.route('/') #设置默认indexdef index(): return 'hello world!'@app.route('/home/<string:username>') # 生成home路由,单一传参def home(username): print(username) return '<h1>欢迎回家</h1>'@app.route('/main/<string:username>/<string:password>') #多个参数传递def main(username,password): print(username) print(password) return '<h1>welcome</h1>'def about(): return 'about page'app.add_url_rule(rule='/about',view_func=about) #另一种添加路由的方式if __name__ == '__main__': app.debug = True #开启debug模式 app.run()
0x02 模版和静态文件
2.1 文件结构
2.2代码#app.py#app.pyfrom flask import Flask,render_template #倒入模版app = Flask(__name__) #声明模版文件夹@app.route(('/index'))def index(): return render_template('index.html') #返回模版if __name__ == '__main__': app.run(debug=True)<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <h1>hello hello</h1> <img src="/static/imgs/1.png"></body></html>
2.3 运行效果
0x03 jsonfrom flask import Flask,jsonifyapp = Flask(__name__)@app.route('/')def index(): user = {'name':'李三','password':'123'} return jsonify(user)if __name__ == '__main__': app.run(debug=True)
3.1运行效果
0x04 重定向
4.1 访问跳转from flask import Flask, redirect #导入跳转模块app = Flask(__name__)@app.route('/index')def index(): return redirect('https://www.baidu.com') #指定跳转路径，访问/index目录即跳到百度首页@app.route('/home')def home(): return 'home page'if __name__ == '__main__': app.run(debug=True)
4.2 打印路由from flask import Flask,url_for #导入模块app = Flask(__name__)@app.route('/index')def index(): return 'test'@app.route('/home')def home(): print(url_for('index')) 打印 index路由 return 'home page'if __name__ == '__main__': app.run(debug=True)
4.3 跳转传参# 访问home，将name带入index并显示在页面from flask import Flask,url_for,redirect #导入模块app = Flask(__name__)@app.route('/index<string:name>')def index(name): return 'test %s' % name@app.route('/home')def home(): return redirect(url_for('index',name='admin'))if __name__ == '__main__': app.run(debug=True)
0x05 jinjia2模版
5.1代码from flask import Flask,render_template #倒入模版app = Flask(__name__) #声明模版文件夹@app.route(('/index'))def index(): user = 'admin' data = ['111',2,'李三'] userinfo = {'username':'lisan','password':'12333'} return render_template('index.html',user=user,data=data,userinfo=userinfo) #返回模版,传入数据if __name__ == '__main__': app.run(debug=True)<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <h1>11111</h1> {{user}} {{data}} #直接传入 {% if user == 'admin'%} #简单逻辑判断 <h1 style="color:red">管理员</h1> {% else %} <h1 style="color:green">普通用户</h1> {% endif %} <hr> {% for item in data %} # for循环 <li>{{item}}</li> {% endfor %} <hr> {{ userinfo['username'] }} {{ userinfo['password'] }} <hr> {{ user | upper }} #字母大写（更多可查阅jinjia2过滤器）</body></html>
5.2 运行效果
0x06 蓝图目的是为了更好的细分功能模块
6.1代码结构├── admin│ └── admin.py└── app.py
6.2 代码#admin.pyfrom flask import Blueprint 导入蓝图模块admin = Blueprint('admin',__name__,url_prefix='/admin') #对象实例化，url_prefix添加路由前缀，表示若想访问本页相关路由，只能通过形如 xxx/admin/login 访问，不能 xxx/login访问@admin.route('/register')def register(): return '欢迎注册'@admin.route('/login')def login(): return '欢迎登录'#app.pyfrom flask import Flaskfrom admin.admin import admin as admin_blueprint # 导入蓝图app = Flask(__name__) #声明模版文件夹app.register_blueprint(admin_blueprint) #注册蓝图@app.route(('/index'))def index(): return 'index page'if __name__ == '__main__': app.run(debug=True)
0x07 登录
7.1结构
7.2代码#web.pyfrom flask import Flask,render_template,request,redirect,flash,url_for,sessionfrom os import urandomapp = Flask(__name__)app.config['SECRET_KEY'] = urandom(50)@app.route('/index')def index(): if not session.get('user'): flash('请登录后操作','warning') return redirect(url_for('login')) return render_template('index.html')@app.route('/login',methods=['GET','POST'])def login(): if request.method == 'GET': return render_template('login.html') elif request.method == 'POST': username = request.form.get('username') password = request.form.get('password') if username == 'admin' and password == '888888': flash('登录成功','success') session['user'] = 'admin' return redirect(url_for('index')) else: flash('登录失败','danger') return redirect(url_for('login'))if __name__ == '__main__': app.run(debug=True)# index.html<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous"><!-- 最新的 Bootstrap 核心 JavaScript 文件 --><script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script></head><body> <h1>欢迎你，管理员</h1> {% for color, message in get_flashed_messages(with_categories=True) %} <div class="alert alert-{{color}} alert-dismissible" role="alert"> <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button> <p>{{message}}</p></div> {% endfor %}</body></html>#login.html<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>login</title> <!-- 最新版本的 Bootstrap 核心 CSS 文件 --><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous"><!-- 最新的 Bootstrap 核心 JavaScript 文件 --><script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script></head><body> <form action="/login" method="post"> <div class='form-group'> <input type="text" name="username" placeholder="请输入用户名" class="form-control"> </div> <div class='form-group'> <input type="password" name="password" placeholder="请输入密码" class="form-control"> </div> <div class="form-group"> <input type="submit" value= "submit" class="btn btn-primary"> </div> </form> {% for color, message in get_flashed_messages(with_categories=True) %} <div class="alert alert-{{color}} alert-dismissible" role="alert"> <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button> <p>{{message}}</p></div> {% endfor %}</body></html>
7.3实现效果7.3.1未登录默认跳转到登录页面 
7.3.2登录成功跳转到index页面 账户密码：admin/888888 
7.3.2登录失败效果 
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