from flask import Flask,render_template,request,redirect,session

app = Flask(__name__,template_folder='templates')

app.secret_key = "sdsfdsgdfgdfgfh"

@app.before_request

def process_request():

    if request.path=="/login":

        return None

    if not session.get("user_info"):

        return redirect("/login")

    return None

@app.after_request

def process_response(response):

    print(2222)

    return response

@app.route("/login",methods=["GET","POST"])

def login():

    if request.method=="GET":

        return render_template("login.html")

    else:

        # print(request.values)   #这个里面什么都有，相当于body

        username = request.form.get("username")

        password = request.form.get("password")

        if username=="haiyan" and password=="":

            session["user_info"] = username

            # session.pop("user_info")  #删除session

            return redirect("/index")

        else:

            # return render_template("login.html",**{"msg":"用户名或密码错误"})

            return render_template("login.html",msg="用户名或者密码错误")

@app.route("/index",methods=["GET","POST"])

def index():
　　 # 用于验证，代码繁重

    # if not session.get("user_info"):

    #     return redirect("/login")

    return render_template("index.html")

if __name__ == '__main__':

    app.run(debug=True)