- 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
主Python文件:
from flask import Flask, render_template, request, url_for, session, redirect from flask_sqlalchemy import SQLAlchemy import config 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) #创建表格 # db.create_all() #数据添加方法 # user=User(username='mis777789',password='g6666') # db.session.add(user) # db.session.commit() # 数据的修改方法 # user = User.query.filter(User.username=='mis777789').first # user.password='0.0.0.0' # db.session.commit() # 数据的删除方法 # user = User.query.filter(User.username=='mis777789').first() # db.session.delete(user) # db.session.commit() @app.route('/') def index(): return render_template("index.html") @app.route('/login',methods=['GET','POST']) def login(): if request.method == 'GET': return render_template('login.html') else: username = request.form.get('id') # 与html页面名字相同 password = request.form.get('password') user = User.query.filter(User.username == username).first() print(username) if user: if user.password==password: session['user']=username session.permanent=True return redirect(url_for('index')) else: return '密码错误' else: return '用户不存在' @app.route('/regis',methods=['GET','POST']) def register(): if request.method=='GET': return render_template('Zhuce.html') else: username=request.form.get('zcid')#与html页面名字相同 password=request.form.get('zcpassword') user=User.query.filter(User.username==username).first() if user: return 'exit' else: user=User(username=username,password=password) db.session.add(user) db.session.commit() return redirect(url_for('login')) @app.context_processor def mycontext(): username=session.get('user') if username: return {'username':username} else: return {} @app.route('/logout') def logout(): session.clear() return render_template('index.html') @app.route('/fankui') def fankui(): return render_template("page_fankui.html") if __name__ == '__main__': app.run(debug=True)
父模板中注销和登录:
<ul class="nav navbar-nav navbar-right"> {% if username %} <li><a href="#"><span class="glyphicon glyphicon-user"></span> {{ username }}</a></li> <li><a href={{ url_for("logout") }}><span class="glyphicon glyphicon-log-in"></span> 注销</a></li> {% else %} <li><a href={{ url_for("register") }}><span class="glyphicon glyphicon-user"></span> 注册</a></li> <li><a href={{ url_for("login") }}><span class="glyphicon glyphicon-log-in"></span> 登录</a></li> {% endif %} </ul>
效果图: