用 spring 引导上传文件

Question

I'm trying to do a simple file upload, but it's giving an error, below is how I did it.

Form:

<div class="container">
   <div th:replace="~{base :: titulo('Disparar Holerites')}"></div>
    <div class="card mt-3">
      <form class="card-body needs-validation" action="/holerite/uploadHoleritesFile" method="POST" enctype="multipart/form-data" novalidate>
        <div>
            <label for="arquivoContabilidade" class="form-label">Arquivo Recebido da Contabilidade</label>
            <div class="input-group has-validation mb-4">
                <input accept=".pdf"  type="file" class="form-control" id="arquivoContabilidade" aria-describedby="inputGroupPrepend" required>

            </div>
        </div>
        <button class="btn btn-primary" type="submit">Enviar</button>
      </form>
  </div>

Controller:

@PostMapping(value = "uploadHoleritesFile")
public String uploadHoleritesFile(@RequestParam("arquivoContabilidade") MultipartFile arquivoContabilidade, RedirectAttributes redirectAttributes){
    logger.info("Entramos aqui");
    logger.info("Recebido o arquivo: "+!arquivoContabilidade.isEmpty());
    if(arquivoContabilidade.isEmpty()){
        return "redirect:holerites/passo1";
    }
    try{
        byte[] bytes = arquivoContabilidade.getBytes();
        Path path = Paths.get(COTABILIDADE_FOLDER + arquivoContabilidade.getOriginalFilename());
        Files.write(path, bytes);


    } catch (IOException e){
        e.printStackTrace();
    }
    return "holerites/passo2";


}

Error:

2022-02-04 18:36:41.048 DEBUG 17136 --- [nio-8080-exec-9] osweb.servlet.DispatcherServlet: "ERROR" dispatch for POST "/error", parameters={multipart} 2022-02-04 18:36:41.057 DEBUG 17136 --- [nio-8080-exec-9] swsmmaRequestMappingHandlerMapping: Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#errorHtml(HttpServletRequest, HttpServletResponse) 2022-02-04 18:36:41.077 DEBUG 17136 --- [nio-8080-exec-9] oswsvContentNegotiatingViewResolver: Selected 'text/html' given [text/html, text/html;q=0.8] 2022-02-04 18:36:41.081 DEBUG 17136 --- [nio-8080-exec-9] osweb.servlet.DispatcherServlet: Exiting from "ERROR" dispatch, status 403

Answer 1

You should add an attribute name="arquivoContabilidade" to your input field in your html. Thymeleaf uses the name attribute when it maps it to a multipart file.

Example:

<input accept=".pdf" name="arquivoContabilidade" type="file" class="form-control" id="arquivoContabilidade" aria-describedby="inputGroupPrepend" required>

Also, I'm assuming that you controller has the annotation @RequestMapping("/holerite") .

If it doesn't you will also have to change

@PostMapping(value = "uploadHoleritesFile")

to

@PostMapping(value = "/holerite/uploadHoleritesFile")

because your form has <form action="/holerite/uploadHoleritesFile" method="POST"...>