Mas o FastAPI também suporta o uso de <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> da mesma forma:

{* ../../docs_src/dataclasses_/tutorial001_py310.py hl[1,6:11,18:19] *}

import jakarta.validation.constraints.Size;

/**
 * The create form for User.
 *
 */
public class CreateForm {

    /**
     * Default constructor.
     */
    public CreateForm() {
        // Empty constructor
    }

    /**
     * The CRUD mode for the form.
     */
    @ValidateTypeFailure
    public Integer crudMode;

    /**

    /**
     * Displays the bad request error page.
     *
     * @param form the error form containing error information
     * @return HTML response for the bad request error page
     */
    @Execute
    public HtmlResponse index(final ErrorForm form) {
        return asHtml(virtualHost(path_Error_BadRequestJsp));
    }

                                    <la:errors/>
                                </div>
                                <div class="form-group row">
                                    <label for="stemmeroverrideFile" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.dict_stemmeroverride_file"/></label>
                                    <div class="col-sm-9">

import java.util.HashMap;
import java.util.Map;

/**
 * Form class for handling error page data and search parameters.
 * This form captures the state of a search request when an error occurs,
 * allowing the error page to display relevant information and preserve search context.
 */
public class ErrorForm {

    /** Map of form fields and their validation error messages */

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str


@app.post("/login/")
async def login(data: FormData = Form()):

package org.codelibs.fess.app.web.admin.joblog;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * Form class for editing job log entries in the admin interface.
 * This form handles the editing of system job execution logs,
 * providing details about scheduled tasks and their execution status.
 */
public class EditForm {

    /**

from typing import Annotated

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str


@app.post("/login/")
async def login(data: Annotated[FormData, Form()]):

                            <div class="row">
                                <div class="col-sm-12">
                                    <la:form styleClass="form-inline"
                                             action="/admin/crawlinginfo/">
                                        <div class="form-group">
                                            <c:set var="ph_session_id">

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * The edit form for Search Log.
 * This form handles the editing of search log entries in the administration interface.
 */
public class EditForm {

    /** CRUD operation mode indicator */
    @ValidateTypeFailure
    public int crudMode;