flask代码——装饰器与CBV

装饰器

# -*- coding:utf-8 -*-
from flask import Flask,request,render_template,jsonify,redirect,send_file,Markup


app = Flask(__name__)

app.config['DEBUG'] = True


@app.before_request
def f1():
    print('before request...')
    return None


@app.after_request
def f2(response):
    print('after request...')
    return response


@app.after_request
def f3(response):
    print('f3...')
    return response

# 自定制错误响应
@app.errorhandler(404)
def err0r404(error_msg):
    print(error_msg)
    # 这个文件位于当前py文件同一个目录下
    return send_file('error_404.jpeg')



@app.route('/',methods=['GET','POST'])
def index():
    dic = {
        'msg':'你好'
    }
    return render_template('index.html',dic=dic)


@app.route('/login',methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    elif request.method == 'POST':
        print(request.form)
        print(request.form.get('password'))

        return '666'


if __name__ == '__main__':
    app.run('127.0.0.1',9001)

对应的登陆页面

<!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>

登陆页面

Flask的CBV写法

# -*- 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)
    # 这个文件位于当前py文件同一个目录下
    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！
app.add_url_rule('/',view_func=LoginView.as_view(name='login'),endpoint='login')

if __name__ == '__main__':

    app.run('127.0.0.1',9011)

～～～

posted on 2019-09-19 17:32 江湖乄夜雨阅读(57) 评论(0) 编辑收藏举报