FLASK 的Session和MoudelForm插件

falsk是小而精的框架，但是热度高，

所有很多爱好者提供了很多扩展插件

功能强大，美而不足的就是兼容稳定性有时候不太好，不过大部分还是很可以的

Flask-Session

flask内置session式写在浏览器上的，感觉和其他框架不太一样，

现在学习一个写在后台的session

现在我想写在redis中，怎么操作呢

先要下载包 ： flask-session

from flask import Flask, render_template
from flask import views  # 导入视图模块
from flask import session
from flask_session import Session  # 导入Session类
from redis import Redis
 
app = Flask(__name__, static_folder="static")
# # # # # # 配置 # # # # # # # #
red = Redis("127.0.0.1", , db=)  # 实例化Redis连接
 
app.config["SESSION_TYPE"] = "redis"  # key大写，value小写！！！
app.config["SESSION_REDIS"] = red  # 指定连接是Redis实例，让session执行写入redis的方法
 
Session(app)  # 添加配置
 
# FBV
@app.route('/')
def index():
    session["key"] = "strong_key"
    print(session)  # <RedisSession {'_permanent': True, 'key': 'strong_key'}>
    # 浏览器观察key是   session  ：8a1561f9-800c-4f03-be69-2ea336c39d39
    # redis中 通过"session:8a1561f9-800c-4f03-be69-2ea336c39d39"获取到value是
    # "\x80\x03}q\x00(X\n\x00\x00\x00_permanentq\x01\x88X\x03\x00\x00\x00keyq\x02X\n\x00\x00\x00strong_keyq\x03u."
    return "this's index"
 
# CBV
class LoginClass(views.MethodView):
 
    def get(self):
 
        return render_template("login.html")
 
    def post(self):
        return "ok"
 
app.add_url_rule("/login", view_func=LoginClass.as_view("login"))
 
app.run(debug=True, host="127.0.0.1", port="")

seesion_py文件

源码大概意思

需要配置的

WTForms - MoudelForm

后端写页面render到前端的组件

学过django应该了解form组件

flask中的第三方库WTForms功能是类似的

开始写一个简单的登录注册吧。。

没有拆分，直接写在一个app上了

from flask import Flask, render_template, request
from flask import views  # 导入视图模块
from wtforms.fields import simple, core
from wtforms import Form
from wtforms import validators
 
app = Flask(__name__, static_folder="static")
 
# # # # # # # # # # # # # # # # # # # #
# # # # # #   MoudelFrom组件  # # # # #
# # # # # # # # # # # # # # # # # # # #
 
class LoginForm(Form):
    username = simple.StringField(
        label="用户名",
        validators=[
            validators.DataRequired(message="不能为空"),
            validators.Length(min=, max=, message="不能小于3位，不能大于5位")
        ],
        render_kw={"class": "my_username"}
    )
 
    password = simple.PasswordField(
        label="密码",
        validators=[
            validators.DataRequired(message="不能为空"),
            validators.length(min=, max=, message="密码必须是6位"),
            validators.Regexp(regex="\d+", message="密码必须是数字")
        ],
        render_kw={"class": "my_pwd"}
    )
 
# 注册页面的form
class RegForm(Form):
    username = simple.StringField(
        label="用户名",
        validators=[
            validators.DataRequired(message="不能为空"),
            validators.Length(min=, max=, message="不能小于3位,不能大于6位")
        ],
        # render_kw={""}  不写了默认class：这个字段（username）
    )
 
    password = simple.PasswordField(
        label="密码",
        validators=[
            validators.DataRequired(message="不能为空"),
            validators.Length(min=, message="密码不能小于6"),
            validators.Regexp(regex="\d+", message="密码必须位数字"),
        ],
        render_kw={"class": "reg_pwd"}
    )
 
    re_password = simple.PasswordField(
        label="重复密码",
        validators=[
            validators.EqualTo(fieldname="password", message="两次密码不一致")
        ]
    )
 
    email = simple.StringField(
        label="邮箱",
        validators=[
            validators.Email(message="格式不正确")
        ],
    )
 
    # 性别    单选
    gender = core.RadioField(
        label="性别",
        coerce=int,
        choices=(
            (, "男"), (, "女"), (, "保密")
        ),
        default=
    )
 
    # 爱好   多选
    hobby = core.SelectMultipleField(
        label="爱好",
        coerce=int,
        choices=(
            (, "小姐姐"),
            (, "小萝莉"),
            (, "小哥哥"),
            (, "小正太"),
            (, "阿姨"),
            (, "大叔"),
        ),
        default=(, )
    )
 
    submit = simple.SubmitField(
        label="提交"
    )
 
# FBV
@app.route('/')
def index():
    return "this's index"
 
# CBV
class LoginClass(views.MethodView):
 
    def get(self):
        login_form = LoginForm()
        return render_template("login.html", lf=login_form)
 
    def post(self):
        login_form = LoginForm(request.form)
        if login_form.validate():
            return ""
        else:
            return render_template("login.html", lf=login_form)
 
class RegClass(views.MethodView):
 
    def get(self):
        rf = RegForm()
        return render_template("reg.html", rf=rf)
 
    def post(self):
        rf = RegForm(request.form)
        if rf.validate():
            return ""
        else:
            return render_template("reg.html", rf=rf)
 
app.add_url_rule("/login", view_func=LoginClass.as_view("login"))
app.add_url_rule("/reg",view_func=RegClass.as_view("reg"))
app.run(debug=True, host="127.0.0.1", port="")

app.py文件

html页面

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta http-equiv="content-Type" charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
<form action="" method="post" novalidate>
    {{ lf.username.label }}{{ lf.username }}{{ lf.username.errors. }}
    <p>{{ lf.password.label }}{{ lf.password }}{{ lf.password.errors. }}</p>
    <input type="submit" value="提交">
    </form>
</body>
</html>

login.html

<head>
    <meta http-equiv="content-Type" charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
<form action="" method="post">
    {% for field in rf %}
        <p>{{ field.label }}{{ field }}{{ field.errors. }}</p>
    {% endfor %}
</form>
 
</body>
</html>

reg.html