如何在Django FormView中使用get_success_url()发送成功消息

from django.urls import reverse
from django.contrib import messages
from django.views.generic.edit import FormView

from django import forms

class MyForm(forms.Form):
    # 定义表单字段和验证规则
    ...

class MyFormView(FormView):
    template_name = 'my_form.html'
    form_class = MyForm

    def get_success_url(self):
        # 发送成功消息
        messages.success(self.request, '表单提交成功！')
        # 返回跳转页面的URL
        return reverse('success_page')

<form method="post">
    {% csrf_token %}
    {{ form }}
    <button type="submit">提交</button>
</form>

from django.urls import path
from .views import MyFormView

urlpatterns = [
    path('my-form/', MyFormView.as_view(), name='my_form'),
    ...
]