- 用上下文处理器app_context_processor定义函数
- 获取session中保存的值
- 返回字典
- 在父模板中更新导航，插入登录状态判断代码。、
- 注意用{% ... %}表示指令。
- {{ }}表示变量
- 完成注销功能。
- 清除session
- 跳转
代码如下：
basic.html
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script language="javascript" type="text/javascript" src="{{url_for('static',filename="js/basic.js") }}"></script> <link rel="stylesheet" type="text/css" href="{{url_for('static',filename="css/basic.css") }}"> <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script> <script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body id="myBody" background="{{url_for('static',filename="img/timg1.jpg") }}"> <ul class="nav nav-pills"> <li class="active"><a href="{{ url_for('index') }}"><h2>Home</h2></a></li> <li><a href="#"><h2>PHP</h2></a></li> <li><a href="#"><h2>JAVA</h2></a></li> <li><a href="#"><h2>C++</h2></a></li> <li class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" href="#"> <h2>更多</h2><span class="caret"></span> </a> <ul class="dropdown-menu"> <li><a href="#"><h2>python</h2></a></li> <li><a href="#"><h2>html</h2></a></li> <li><a href="#"><h2>jsp</h2></a></li> </ul> </li> <li><a href="#"><h2>...... </h2></a></li> <li> <input class="d1" type="text" placeholder="搜索从这里开始..."> <button class="b" type="submit">搜索</button></li> <li><img id="myOnOff" onclick="mySwitch()" src="http://www.runoob.com/images/pic_bulbon.gif" width="40px"> </li> {% if username %} <li><a href="#"><h2>{{ username }}</h2></a></li> <li><a href="{{ url_for('logout') }}"><h2>注销</h2></a></li> {% else %} <li><a href="{{ url_for('login') }}"><h2>登录</h2></a></li> <li><a href="{{ url_for('zhuce') }}"><h2>注册</h2></a></li> {% endif %} <li><a href="#"><h2>联系我</h2></a></li> </ul> <img id="gui" onclick="mySwitch()" src="" width="1700px"> {% block aa %}{% endblock %} <p><h1>此处是用户名:{{username }}</h1></p> <div id="didao"> <div class="img"><a href="http://www.baidu.com"><img src="http://scimg.jb51.net/allimg/140408/10-14040QG01GU.jpg"></a><div class="desc"></div><a href="http://www.baidu.com">更多搜索</a></div> <div class="img"><a href="http://www.baidu.com"><img src="http://imgstore.cdn.sogou.com/app/a/100540002/800197.jpg"></a><div class="desc"></div><a href="http://www.gzcc.cn/">教务系统</a></div> <div class="img"><a href="http://www.baidu.com"><img src="http://4493bz.1985t.com/uploads/allimg/150625/1-1506251F320.jpg"></a><div class="desc"></div><a href="http://bbs.tianya.cn/">友情论坛</a></div> <div class="img"><a href="http://www.baidu.com"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1510223061&di=bc9ea322068f5f0311fb2ab6fe9db29a&imgtype=jpg&er=1&src=http%3A%2F%2Fwww.005.tv%2Fuploads%2Fallimg%2F160920%2F103J12649-15.jpg"></a><div class="desc"></div><a href="{{ url_for('index') }}">回到顶部</a></div> </div> <footer> <div class="foot"> <div > <a href="#"> 联系我们</a> · <a href="#"> 加入我们</a> · <a href="#"> 品牌与徽标 </a> · <a href="#">帮助中心</a> · <a href="#">合作伙伴</a></div> <div>©2015-2017 广州商学院信息技术与工程学院 / 粤ICP备278953737号-5 / 粤公网安备2015060050046号 / Smrz 粤公网安备201506050046号 / Wxb 举报电话：020-66666666</div> </div> </footer> </body> </html>
py文件：
from flask import Flask from flask import render_template,request,redirect,url_for,session import config from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config.from_object(config) db = SQLAlchemy(app) class User(db.Model): __tablename__ = 'user' # 建立一个表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) say = db.Column(db.String(50)) #db.create_all() class Log(db.Model): __tablename__ = 'log' # 建立一个表log 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) #db.create_all() # 添加数据 # user=User(username='yujiujiu2',password='11111') # db.session.add(user) # db.session.commit() # # 查找数据 # user=User.query.filter(User.username=='yujiujiu').first() # print(user.username,user.password) # 修改数据 # user=User.query.filter(User.username=='yujiujiu').first() # user.password='666667' # print(user.username,user.password) # db.session.commit() # 删除数据 # user=User.query.filter(User.username=='yujiujiu2').first() # db.session.delete(user) # db.session.commit() @app.route('/') def index(): return render_template('basic.html') #第1种写法，存入Log表里面的数据与User表对比 # @app.route('/login/',methods=['GET','POST']) # def login(): # if request.method=='GET': # return render_template('login.html') # else: # username=request.form.get('username') # password=request.form.get('password') # # log=Log.query.filter(User.username==username,User.password==password).first() # #判断用户名是否存在 # if log: # log = Log(username=username, password=password) # db.session.add(log) # db.session.commit() # return redirect(url_for('index')) # # else: # # return u' error username or password' # 重新定向到首页 #第二种写法 @app.route('/login/',methods=['GET','POST']) def login(): if request.method=='GET': return render_template('login.html') else: usern=request.form.get('username') passw=request.form.get('password') user=User.query.filter(User.username==usern).first() #判断用户名是否存在 if user: if user.password==passw: session['user'] = usern#字典键值 session.permanent = True return redirect(url_for('index')) else: return u' password error' else: return u' username not existed' @app.context_processor def mycontext(): usern=session.get('user') if usern: return {'username':usern} else: return {} @app.route('/logout') def logout(): session.clear() return redirect(url_for('index')) @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') say=request.form.get('say') user=User.query.filter(User.username==username).first() #判断用户名是否存在 if user: return u' username existed' else: user=User(username=username,password=password,say=say) db.session.add(user) db.session.commit() return redirect(url_for('login')) # 重新定向到登录页 if __name__ == '__main__': app.run(debug=True)
confit.py:
import os DEBUG=True SECRET_KEY=os .urandom(24) DIALECT='mysql' DRIVER='mysqldb' USERNAME='miaomiaoyu' PASSWORD='201506050046' HOST='119.23.58.9' PORT='3306' DATABASE='python' SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://miaomiaoyu:201506050046@119.23.58.9:3306/python?charset=utf8' SQLALCHEMY_TRACK_MODIFICATIONS = False
运行结果：
