flask基础3——CBV实现登陆的实例

CBV的使用

后台的写法1——普通的用法：

# -*- coding:utf-8 -*-

from flask import Flask, views, render_template, request

app = Flask(__name__)

app.debug = True

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

class Login(views.MethodView):

    # 这样写的话就只支持get方法了~~
    # methods = ['GET']

    def get(self):
        return render_template('login.html')

    def post(self):
        uname = request.form.get('username')
        pwd = request.form.get('password')
        if uname == 'whw' and pwd == '123':
            return '登陆成功'
        else:
            return '登陆失败'

# 必须用add_url_rule方法来调用！
# as_view必须有一个name参数！
app.add_url_rule('/login',endpoint='login',view_func=Login.as_view(name='login'))


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

普通的写法

后台的写法2——有打散传参的方式：

# -*- coding:utf-8 -*-
from flask import views,Flask,request,render_template,send_file


app = Flask(__name__)
app.debug = True

# 自定制错误响应
@app.errorhandler(404)
def err0r404(error_msg):
    print(error_msg)
    return send_file('error_404.jpeg')


class LoginView(views.MethodView):

    def get(self):
        return render_template('login.html')

    def post(self):
        uname = request.form.get('username')
        pwd = request.form.get('password')
        print(uname,'>>>',pwd)
        if uname == 'whw' and pwd == '123':
            # msg = '登陆成功！'
            # msg_class = 'green'
            # return render_template('login.html',msg=msg,msg_class=msg_class)
            dic = {'msg':'登陆成功',
                   'msg_class':'green'
                   }

            return render_template('login.html',**dic)

        else:
            msg = '登陆失败！'
            msg_class = 'red'
            return render_template('login.html',msg=msg,msg_class=msg_class)


# # 必须用add_url_rule方法来调用！
# as_view必须有一个name参数！
app.add_url_rule('/',view_func=LoginView.as_view(name='login'),endpoint='login')


if __name__ == '__main__':
    app.run('127.0.0.1',9011)

login.html页面：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
    <style>
        .red{
            color:red;
        }
        .green{
            color: green;
        }
    </style>
</head>
<body>

<form action="" method="post">
    用户名: <input type="text" name="username"  autocomplete="off">
    密码： <input type="password" name="password" autocomplete="off">
    <input type="submit">
    <span class="{{ msg_class }}">{{ msg }}</span>
</form>

</body>
</html>

posted on 2019-07-12 10:09 江湖乄夜雨阅读(181) 评论(0) 编辑收藏举报