Flask基础-基础实例
1. 10行代码的迷你程序 flask项目
from flask import Flask
app = Flask(__name__)
@app.route("/index")
def inde():
return "heeello world"
if __name__ =="__main__":
app.run()
2.页面登录的小程序+session简单用法.
from flask import Flask,render_template,request,redirect,session
app = Flask(__name__)
app.secret_key="dd"
@app.route("/login",methods =["GET","POST"])
def login():
if request.method =='GET':
return render_template("login.html")
#request.form为post请求
user =request.form.get("user")
pwd =request.form.get("pwd")
if user =="hailong" and pwd =="kuang":
#设置session , flask的session存放在cookie当中
session["user_infor"]=user
print(22)
return redirect("/index")
print(111)
return render_template("login.htm",msg ="用户密码错误")
@app.route("/index")
def index():
#获取cookie 判断是否存在,如果存在并匹配进行跳转到相关页面
user_infor =session.get("user_infor")
print(222,user_infor)
if not user_infor:
return redirect("/login")
return render_template("index.html")
if __name__ =="__main__":
app.run()
login页面
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>login</title> </head> </head> <body> <h1> 用户登录</h1> <form method="post"> <input type="text" name ="user"> <input type="password" name ="pwd"> <input type="submit" value="提交">{{msg}} </form> </body> </html>
index界面
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h1>欢迎来到郝龙江家里</h1> </body> </html>
3 .auth认证.
1 from flask import Flask,render_template,request,redirect,session 2 3 app = Flask(__name__) 4 5 app.secret_key = '39jrlasdfoajslfu8af' 6 7 8 import functools 9 10 def auth(func): 11 @functools.wraps(func) # 保留函数的元信息 12 def inner(*args,**kwargs): 13 if not session.get('user_info'): 14 return redirect('/login') 15 ret = func(*args,**kwargs) 16 return ret 17 return inner 18 19 20 @app.route('/login',methods=['GET','POST']) 21 def login(): 22 if request.method == 'GET': 23 return render_template('login.html') 24 25 user = request.form.get('user') 26 pwd = request.form.get('pwd') 27 if user == 'hailong' and pwd == 'kuang': 28 session['user_info'] = user 29 return redirect('/index') 30 return render_template('login.html',msg="用户名或密码错误") 31 32 33 @app.route('/index') 34 @auth 35 def index(): 36 kuang_list = [ 37 {'id':1,'name':'一矿','address':'大同'}, 38 {'id':2,'name':'二矿','address':'大同'}, 39 {'id':3,'name':'三矿','address':'大同'}, 40 ] 41 42 return render_template('index.html',klist=kuang_list) 43 # return render_template('index.html',**{'klist':kuang_list}) 44 45 @app.route('/detail') 46 @auth 47 def detail(): 48 nid = request.args.get('nid') 49 return render_template('detail.html') 50 51 52 @app.route('/logout') 53 def logout(): 54 del session['user_info'] 55 56 return redirect('/login') 57 58 if __name__ == '__main__': 59 app.run()
4.中间件
1 from flask import Flask,render_template,request,redirect,session 2 3 app = Flask(__name__) 4 5 app.secret_key = '39jrlasdfoajslfu8af' 6 7 8 @app.before_request 9 def xxxxxxxxxxxxxx(): 10 if request.path == '/login': 11 return None 12 13 if not session.get('user_info'): 14 return redirect('/login') 15 16 17 @app.route('/login',methods=['GET','POST']) 18 def login(): 19 print('我是login') 20 if request.method == 'GET': 21 return render_template('login.html') 22 23 user = request.form.get('user') 24 pwd = request.form.get('pwd') 25 if user == 'hailong' and pwd == 'kuang': 26 session['user_info'] = user 27 return redirect('/index') 28 return render_template('login.html',msg="用户名或密码错误") 29 30 31 @app.route('/index') 32 def index(): 33 print('我是index') 34 kuang_list = [ 35 {'id':1,'name':'一矿','address':'大同'}, 36 {'id':2,'name':'二矿','address':'大同'}, 37 {'id':3,'name':'三矿','address':'大同'}, 38 ] 39 40 return render_template('index.html',klist=kuang_list) 41 # return render_template('index.html',**{'klist':kuang_list}) 42 43 @app.route('/detail') 44 def detail(): 45 nid = request.args.get('nid') 46 return render_template('detail.html') 47 48 49 @app.route('/logout') 50 def logout(): 51 del session['user_info'] 52 53 return redirect('/login') 54 55 if __name__ == '__main__': 56 app.run()
