一、Flask的视图CBV

as_view中的name参数是在路由中endpoint参数不存在时代替endpoint来实现反向解析url的功能的，这个参数是必传的，在endpoint和name同时存在是name作用不生效！！！

两个视图类方法：

methods = ["GET","POST"] //视图类的方法

decorators = ["wrapper1","wrapper2"] //给类添加装饰器

from flask import Flask,url_for,viewsapp = Flask(__name__)class Index(views.MethodView):    methods = ["GET","POST"]   //视图类的方法    decorators = ["wrapper1","wrapper2"]   //给类添加装饰器    def get(self):        print(url_for("indexs"))        return "this is GET request"    def post(self):        return "this is POST　request"app.add_url_rule("/index", view_func=Index.as_view(name = "indexs"))app.run()

二、Flask中的插件Flask-Session

下载Flask-Session：
pip3 install redis
pip3 install Flask-Session

导入：
from flask import Flask, session
from flask_session import Session
from redis import Redis

配置：
app.config["SESSION_TYPE"] = "redis"
app.config["SESSION_REDIS"] = Redis(host="127.0.0.1",port=6379,db=5)

替换：
Session(app)

使用：
设置：session["user"] = "aasdf"
取值：session.get("user")

使用示例：

from flask import Flask, url_for, viewsfrom flask_session import Sessionfrom flask import sessionfrom redis import Redisapp = Flask(__name__)app.config["SESSION_TYPE"] = "redis"app.config["SESSION_REDIS"] = Redis(host="127.0.0.1", port=6379, db=5)app.secret_key = "wangjifei111"   //可有可无Session(app)class Index(views.MethodView):    def get(self):        session["name"] = "wangjifei"        return "this is GET request"    def post(self):        return "this is POST　request"app.add_url_rule("/index", view_func=Index.as_view("indexs"))app.run()

三、Flask中的WTforms的使用（和Django的form非常类似，就不累述了）

下载：
pip3 install wtforms

简单使用：

from flask import Flask, url_for, views, render_template, requestfrom flask_session import Sessionfrom flask import sessionfrom redis import Redisfrom wtforms.fields import simple, corefrom wtforms import Formfrom wtforms import validatorsapp = Flask(__name__)app.config["SESSION_TYPE"] = "redis"app.config["SESSION_REDIS"] = Redis(host="127.0.0.1", port=6379, db=5)Session(app)class LoginForm(Form):    username = simple.StringField(        label="用户名",        validators=[            validators.DataRequired(message="数据不能为空"),            validators.Length(min=5, max=16, message="大于5小于16")        ],        render_kw={"class": "form-control"}    )    password = simple.PasswordField(        label="密码",        validators=[            validators.DataRequired(message="数据不能为空"),            validators.Length(min=5, max=16, message="大于5小于16"),            validators.Regexp(regex="\d+", message="密码必须为数字")        ],        render_kw={"class": "form-control"}    )class Login(views.MethodView):    def get(self):        loginfm = LoginForm()        return render_template("login.html", login_html=loginfm)    def post(self):        loginfm = LoginForm(request.form)        if not loginfm.validate():            return render_template("login.html", login_html=loginfm)        session["user"] = "wangjifei"        return "登陆成功"app.add_url_rule("/login", endpoint="class_login", view_func=Login.as_view(name="login"))app.run()

    
         login界面    
     
         
              
       
                    {% for field in login_html %}                
        
                             {
    { field.label }}:{
    { field }}
         
{
    { field.errors.0 }}                
        
            {% endfor %}

略微复杂的使用：

from flask import Flask, url_for, views, render_template, requestfrom flask_session import Sessionfrom flask import sessionfrom redis import Redisfrom wtforms.fields import simple, corefrom wtforms import Formfrom wtforms import validatorsapp = Flask(__name__)app.config["SESSION_TYPE"] = "redis"app.config["SESSION_REDIS"] = Redis(host="127.0.0.1", port=6379, db=5)Session(app)class RegForm(Form):    username = simple.StringField(        label="用户名",        validators=[            validators.DataRequired(message="数据不能为空"),            validators.Length(min=5, max=16, message="大于5小于16")        ],        render_kw={"class": "form-control"}    )    password = simple.PasswordField(        label="密码",        validators=[            validators.DataRequired(message="数据不能为空"),            validators.Length(min=5, max=16, message="大于5小于16"),            validators.Regexp(regex="\d+", message="密码必须为数字")        ],        render_kw={"class": "form-control"}    )    repassword = simple.PasswordField(        label="密码",        validators=[            validators.DataRequired(message="数据不能为空"),            validators.EqualTo("password", message="两次密码不一致")        ],        render_kw={"class": "form-control"}    )    gender = core.RadioField(        label="性别",        choices=(            (1, "女"),            (2, "男"),            (3, "未知")        ),        coerce=int,        default=3,    )    hobby = core.SelectMultipleField(        label="嗜好",        choices=[(1, "健身"),(2,"喝酒"),(3,"旅游")],        coerce=int,        default=1,        render_kw={"class": "form-control"}    )@app.route("/register", methods=["GET", "POST"])def reg():    if request.method == "GET":        regfm = RegForm()        return render_template("reg.html", reg_html=regfm)    else:        regfm = RegForm(request.form)        if not regfm.validate():            return render_template("reg.html", reg_html=regfm)        print(regfm.data.get("hobby"),              regfm.data.get("gender")              )        return "注册成功"app.run()

reg.html

    
         Title    
     
         
              
       
                    {% for field in reg_html %}                
        
                             {
    { field.label }}:{
    { field }}
         
{
    { field.errors.0 }}                
        
            {% endfor %}