本代码，为上一代码扩展，增加了登陆后跳转的功能
from flask import Flask,render_template,redirect,url_for,session
from flask_wtf import FlaskForm
from wtforms import StringField,PasswordField,SubmitField
from wtforms.validators import DataRequired,EqualTo
app = Flask(__name__)
app.config["SECRET_KEY"] = "asdfewq"
#定义表单的模型类
class RegisterForm(FlaskForm):
"""
自定义的注册表单模型类
"""
# label为字段说明标签,第二个参数验证器
# DataRequired 保证数据必须填写，并且不能为空
user_name = StringField(label="用户名",validators=[DataRequired("用户名不能为空")])
password = PasswordField(label="密码",validators=[DataRequired("密码不能为空")])
password2 = PasswordField(label="确认密码",validators=[DataRequired("确认密码不能为空"),
EqualTo("password","两次密码不一致")])
submit = SubmitField(label="提交")
@app.route("/register",methods=["GET","POST"])
def register():
# 创建表单对象,如果是post请求，前端发送数据
# flask会把数据在构造form对象的时候，存放到对象中
form = RegisterForm()
# 判断form中的数据是否合理
if form.validate_on_submit():
# 表示验证合格
# 提取数据
uname = form.user_name.data
pwd = form.password.data
pwd2 = form.password2.data
print(uname,pwd,pwd2)
session["user_name"] = uname
return redirect(url_for("index"))
# 如果form中的数据，完全满足所有的验证器，则返回真，否则返回假
return render_template("register.html",form=form)
@app.route("/index")
def index():
user_name = session.get("user_name","")
return "Hello %s" % user_name
if __name__ == '__main__':
app.run(debug=True)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form method="post">
#token很重要
{{ form.csrf_token }}
{{ form.user_name.label }}
<p>{{ form.user_name }}</p>
{% for msg in form.user_name.errors %}
<p>{{ msg }}</p>
{% endfor %}
{{ form.password.label }}
<p>{{ form.password }}</p>
{% for msg in form.password.errors %}
<p>{{ msg }}</p>
{% endfor %}
{{ form.password2.label }}
<p>{{ form.password2 }}</p>
{% for msg in form.password2.errors %}
<p>{{ msg }}</p>
{% endfor %}
{{ form.submit }}
</form>
</body>
</html>
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