密码保护

1.更新User对象，设置对内的_password

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(200), nullable=False)
    nickname = db.Column(db.String(20), nullable=True)

2.编写对外的password

 @property
    def password(self):  #外部使用
        return self._password
    @password.setter
    def password(self,row_password):
        self._password=generate_password_hash(row_password)

3.密码验证方法：

 def check_password(self,row_password):
        result=check_password_hash(self._password,row_password)
        return result

4.登录验证：

@app.route('/login/', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('lx2.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        # 判断用户名是否存在
        if user:
            if user.check_password(password):
                session['user'] = username
                session['userid']=user.id
                session.permanent = True
                return redirect(url_for('lx'))
            else:
                return u'密码错误'
        else:
            return u'账号不存在'