怒发冲冠，凭栏处、潇潇雨歇。抬望眼，仰天长啸，壮怀激烈。三十功名尘与土，八千里路云和月。莫等闲，白了少年头，空悲切！
靖康耻，犹未雪。臣子恨，何时灭！驾长车，踏破贺兰山缺。壮志饥餐胡虏肉，笑谈渴饮匈奴血。待从头、收拾旧山河，朝天阙。
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,views
app = 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, views
from flask_session import Session
from flask import session
from redis import Redis
app = 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, request
from flask_session import Session
from flask import session
from redis import Redis
from wtforms.fields import simple, core
from wtforms import Form
from wtforms import validators
app = 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.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>login界面</title>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.css" rel="stylesheet">
</head>
<body>
<div class="row">
<div class="col-md-8 col-md-offset-2">
<form action="" method="post">
{% for field in login_html %}
<div class="form-group">
{{ field.label }}:{{ field }}<br>{{ field.errors.0 }}
</div>
{% endfor %}
<input type="submit" class="btn btn-seccess" value="提交">
</form>
</div>
</div>
</body>
</html>
- 略微复杂的使用：
from flask import Flask, url_for, views, render_template, request
from flask_session import Session
from flask import session
from redis import Redis
from wtforms.fields import simple, core
from wtforms import Form
from wtforms import validators
app = 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
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.css" rel="stylesheet">
</head>
<body>
<div class="row">
<div class="col-md-8 col-md-offset-2">
<form action="" method="post">
{% for field in reg_html %}
<div class="form-group">
{{ field.label }}:{{ field }}<br>{{ field.errors.0 }}
</div>
{% endfor %}
<input type="submit" class="btn btn-seccess" value="提交">
</form>
</div>
</div>
</body>
</html>
网友评论