from flask import session
import json
app=Flask(__name__,template_folder='templates',static_path='/static/',static_url_path='/static/')
app.debug=True
#设置session加密
app.secret_key='sjehfjeefrjewth43u'
#指定json编码格式 如果为False 就不使用ascii编码，
app.config['JSON_AS_ASCII']=False
app.config['JSONIFY_MIMETYPE']
#指定浏览器渲染的文件类型，和解码格式；="application/json;charset=utf-8" 

@app.route('/login/',methods=['GET','POST'])
def login():msg = ''if request.method=='POST':name=request.values.get('user')pwd=request.values.get('pwd')if name =='zhanggen' and pwd=='123.com':session['user']=name  #设置session的key valuereturn redirect('/index/')else:msg='用户名或者密码错误'return render_template('login.html',msg=msg)@app.route('/index/',methods=['GET','POST'])
def index():user_list = ['张根', 'egon', 'eric']user=session.get('user')           #获取sessionif user:user=['alex','egon','eric']return jsonify(user_list)else:return redirect('/login/')if __name__ == '__main__':app.run()Flask自带session功能

安装 pip install flask-session

from flask import session, Flask,request,make_response,render_template,redirect,jsonify,Response#引入第三方session
from flask.ext.session import Session
import json
app=Flask(__name__,template_folder='templates',static_path='/static/',static_url_path='/static/')
app.debug=True#设置session加密
app.secret_key='sjehfjeefrjewth43u'
app.config['JSON_AS_ASCII']=False  #指定json编码格式 如果为False 就不使用ascii编码，
app.config['JSONIFY_MIMETYPE'] ="application/json;charset=utf-8" #指定浏览器渲染的文件类型，和解码格式；

app.config['SESSION_TYPE']='redis'from redis import Redis        #引入连接 redis模块
app.config['SESSION_REDIS']=Redis(host='192.168.0.94',port=6379) #连接redis
Session(app)@app.route('/login/',methods=['GET','POST'])
def login():msg = ''if request.method=='POST':name=request.values.get('user')pwd=request.values.get('pwd')if name =='zhanggen' and pwd=='123.com':session['user']=name  #设置session的key valuereturn redirect('/index/')else:msg='用户名或者密码错误'return render_template('login.html',msg=msg)@app.route('/index/',methods=['GET','POST'])
def index():user_list = ['张根', 'egon', 'eric']user=session.get('user')           #获取sessionif user:user=['alex','egon','eric']return jsonify(user_list)else:return redirect('/login/')if __name__ == '__main__':app.run()把session存到redis

#views.py文件中写from flask import Blueprint  # 导入 Flask 中的蓝图 Blueprint 模块
from flask import render_templatesv = Blueprint("sv",__name__,template_folder="sv_template",  # 每个蓝图都可以为自己独立出一套template模板文件夹,如果不写则共享项目目录中的templatesstatic_folder="sv_static"  # 静态文件目录也是可以独立出来的)  # 实例化一个蓝图(Blueprint)对象（切记！！！！！！注册！！！！！！！！！！！！！！！！）
@sv.route("/svlist")
def view_list():return render_template("svlist.html")

#s4app.html中写入from flask import Blueprint  # 导入 Flask 中的蓝图 Blueprint 模块
from flask import render_templatesv = Blueprint("sv",__name__,template_folder="sv_template",  # 每个蓝图都可以为自己独立出一套template模板文件夹,如果不写则共享项目目录中的templatesstatic_folder="sv_static"  # 静态文件目录也是可以独立出来的)  # 实例化一个蓝图(Blueprint)对象
@sv.route("/svlist")
def view_list():return render_template("svlist.html")

from flask import Flask,request,flash,get_flashed_messagesapp = Flask(__name__)
app.secret_key = 'some_secret'@app.route('/set/')
def index2():flash('Disposable')    #在message中设置1个个值return 'ok'#---------------------------------------------------------------------------------

@app.route('/')
def index1():messages = get_flashed_messages() #获取message中设置的值，只能获取1次。（1次性）print(messages)return "Index1"if __name__ == "__main__":app.run()flask_message

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask, Request, render_templateapp = Flask(__name__, template_folder='templates')
app.debug = True@app.before_first_request  #第1个请求到来执行
def before_first_request1():print('before_first_request1')@app.before_request #中间件2
def before_request1():Request.nnn = 123print('before_request1')  #不能有返回值，一旦有返回值在当前返回
@app.before_request
def before_request2():print('before_request2')@app.errorhandler(404)
def page_not_found(error):return 'This page does not exist', 404@app.route('/')
def hello_world():return "Hello World"@app.after_request #中间件 执行视图之后
def after_request1(response):print('after_request1', response)return response@app.after_request #中间件 执行视图之后 先执行 after_request2
def after_request2(response):print('after_request2', response)return responseif __name__ == '__main__':app.run()