完成登录功能，用session记住用户名

Posted 2020-10-15 陌上寻

登录功能完成：

1. js:设置return
2. html:设置
   1. form
   2. input
3. py:
   1. @app.route设置methods
   2. GET
   3. POST
      1. 读取表单数据
      2. 查询数据库
         1. 用户名密码对：
            1. 记住用户名
            2. 跳转到首页
         2. 用户名密码不对：
            1. 提示相应错误。

session：

1. 从`flask`中导入`session`
2. 设置`SECRET_KEY`
3. 操作字典一样操作`session`：增加用户名`session[‘username‘]=`username

 

登录功能完成：

 1 @app.route(‘/login/‘, methods=[‘GET‘, ‘POST‘])
 2 def login():
 3     if request.method == ‘GET‘:
 4         return render_template("login.html")
 5     else:
 6         username = request.form.get(‘username‘)
 7         password = request.form.get(‘password‘)
 8         user = User.query.filter(User.username == username).first()
 9         if user:
10             if user.password == password:
11                 return redirect(url_for(‘myweb‘))
12             else:
13                 return ‘密码错误‘
14         else:
15             return ‘用户名不存在‘

 1  <div class="logo_box">
 2         <h3 style="text-align: center">欢迎你</h3>
 3         <form action="{{ url_for(‘login‘) }}" method="post">
 4             <div class="input_outer">
 5                 <span class="u_user"></span>
 6                 <input id="uname" class="text" style="color: wheat" type="text" placeholder="请输入账号" name="username">
 7             </div>
 8             <div class="input_outer">
 9                 <span class="us_uer"></span>
10                 <input id="upass" class="text" style="color:wheat ; position:absolute; z-index:100;"
11                        value="" type="password" placeholder="请输入密码" name="password">
12             </div>
13             <div class="errorText" id="error_box" style="color: red"><br></div>
14             <div>
15                 <button onclick="return fnLogin()" class="lb1" style="color:black">登录</button>
16             </div>
17         </form>
18     </div>

 

session:

 1 import os
 2 DEBUG = True
 3 
 4 SECRET_KEY = os.urandom(24)
 5 
 6 DIALECT = ‘mysql‘
 7 DRIVER = ‘mysqldb‘
 8 USERNAME = ‘root‘
 9 PASSWORD = ‘ROOT‘
10 HOST = ‘127.0.0.1‘
11 DATABASE = ‘mytest‘
12 
13 
14 SQLALCHEMY_DATABASE_URI = ‘mysql+pymysql://root:@127.0.0.1:3306/mytest?charset=utf8‘
15 SQLALCHEMY_TRACK_MODIFICATIONS = False