一、简单介绍flask中的wtforms
WTForms是一个支持多个web框架的form组件，主要用于对用户请求数据进行验证。
安装：
pip3 install wtforms
用户登录简例：
from flask import Flask,render_template,request,redirect from wtforms.fields import core from wtforms.fields import html5 from wtforms.fields import simple from wtforms import Form from wtforms import validators from wtforms import widgets app = Flask(__name__,template_folder="templates") class Myvalidators(object): '''自定义验证规则''' def __init__(self,message): self.message = message def __call__(self, form, field): print(field.data,"用户输入的信息") if field.data == "haiyan": return None raise validators.ValidationError(self.message) class LoginForm(Form): '''Form''' name = simple.StringField( label="用户名", widget=widgets.TextInput(), validators=[ Myvalidators(message="用户名必须是haiyan"),#也可以自定义正则 validators.DataRequired(message="用户名不能为空"), validators.Length(max=8,min=3,message="用户名长度必须大于%(max)d且小于%(min)d") ], render_kw={"class":"form-control"} #设置属性 ) pwd = simple.PasswordField( label="密码", validators=[ validators.DataRequired(message="密码不能为空"), validators.Length(max=8,min=3,message="密码长度必须大于%(max)d且小于%(min)d"), validators.Regexp(regex="d+",message="密码必须是数字"), ], widget=widgets.PasswordInput(), render_kw={"class":"form-control"} ) @app.route('/login',methods=["GET","POST"]) def login(): if request.method =="GET": form = LoginForm() # 传递form return render_template("login.html",form=form) else: form = LoginForm(formdata=request.form) if form.validate(): # 校验 print("用户提交的数据用过格式验证，值为：%s"%form.data) return "登录成功" else: print(form.errors,"错误信息") return render_template("login.html",form=form) if __name__ == '__main__': # app.__call__() app.run(debug=True)
login.html
<body> <form action="" method="post" novalidate> <p>{{ form.name.label }} {{ form.name }} {{ form.name.errors.0 }}</p> <p>{{ form.pwd.label }} {{ form.pwd }} {{ form.pwd.errors.0 }}</p> <input type="submit" value="提交"> <!--用户名：<input type="text">--> <!--密码：<input type="password">--> <!--<input type="submit" value="提交">--> </form> </body>