完成登录功能，用session记住用户名

登录功能完成：

  1. js:设置return
  2. html:设置
    1. form
    2. input
    3. onclick="return fnLogin()"
  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

 

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
from functools import wraps
from  datetime import datetime

app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)

class User(db.Model):
    __tablename__ = 'User'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)
    userphone = db.Column(db.String(20),nullable=False)

class Question(db.Model):
    __tablename__ = 'question'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    title = db.Column(db.String(100), nullable=False)
    detail = db.Column(db.Text, nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey('User.id'))
    author = db.relationship('User', backref=db.backref('question'))

#db.create_all()

@app.route('/')
def zhuye():
    return render_template('zhuye.html')

@app.route('/denglu/',methods=['GET','POST'])
def denglu():
    if request.method == 'GET':
        return render_template('denglu.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password == password:
                session['user'] = username
                session.permanent = True
                return redirect(url_for('zhuye'))
            else:
                return '密码错误！'
        else:
            return '不存在该用户名！'


@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method == 'GET':
        return render_template('zhuce.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        userphone = request.form.get('userphone')
        user = User.query.filter(User.username == username).first()
        if user:
            return 'username existed.'
        else:
            user1 = User(username=username, password=password, userphone=userphone,)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('denglu'))

def loginFirst(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        if session.get('user'):
            return func(*args, **kwargs)
        else:
            return redirect(url_for('denglu'))
    return wrapper


@app.route('/question/',methods=['GET','POST'])
@loginFirst
def question():
    if request.method == 'GET':
        return render_template('question.html')
    else:
        title = request.form.get('title')
        detail = request.form.get('detail')
        author_id = User.query.filter(User.username == session.get('user')).first().id
        question = Question(title=title, detail=detail, author_id=author_id)
        db.session.add(question)
        db.session.commit()
        return redirect(url_for('zhuye'))

@app.context_processor
def mycontext():
    username=session.get('user')
    if username:
        return {'username':username}
    else:
        return {}
@app.route('/logout/')
def logout():
    session.clear()
    return redirect(url_for('zhuye'))

if __name__ == '__main__':
    app.run(debug=True)
{% extends'base.html' %}
{% block title %}
    Login
{% endblock %}
{% block head %}
    <link rel="stylesheet" href="{{ url_for('static',filename='css/denglu.css')}}">
    <script src="{{ url_for('static',filename='js/denglu.js') }}"></script>

{% endblock %}
{% block main %}
<body bgcolor="#faebd7">
<div class="div1">
    <div class="div2">登录</div>
    <form class="form" method="post" action="{{ url_for('denglu') }}">
    <div class="div3">
       <div class="iconfont ic-user"></div> 用户：<input id="username" type="text" placeholder="请输入用户名" name="username">
    </div>
    <div class="div3">
        密码：<input id="userpass" type="text" placeholder="请输入密码" name="password">
    </div>
    <div id="error_box"><br></div>
     <div class="div3">
        <button onclick="myLogin()">登陆</button>
    </div>
    <div class="div2">登陆遇到问题？</div>
     </form>
</div>
<br>
</body>
{% endblock %}

posted @ 2017-11-23 21:21  057吴代祺  阅读(123)  评论(0)  编辑  收藏  举报