Java 如何使用HtmlUnit以表单形式提交文件

我对这张表格有问题

<form action="/incoming/Upload.cfg" enctype="multipart/form-data" method="post" onsubmit="return doSubmit();">
  <table id="autoWidth" border="0" style="width: 100%;">
    <tbody>
      <tr>
        <td class="h1" colspan="4" id="t_title">
          Резервная копия и Восстановление
        </td>
      </tr>
      <tr>
        <td class="blue" colspan="4"/>
      </tr>
      <tr>
        <td class="Item" id="t_backup">
          Сохранить:
        </td>
        <td colspan="3">
          <input type="button" class="buttonBigL" name="Backup" value="Резервная копия" onclick="location.href='config.bin';"/>
        </td>
      </tr>
      <tr>
        <td class="Item" id="t_file">
          Файл:
        </td>
        <td>
          <input class="text" name="filename" type="file" size="20" onkeydown="return false"/>

            
        </td>
        <td>
          <input name="Restore" type="submit" class="buttonBigL" id="Submit" value="Восстановить"/>
        </td>
        <td width="100%">
           
        </td>
      </tr>
      <tr>
        <td class="blue" colspan="4"/>
      </tr>
    </tbody>
  </table>
</form>

---

什么也没发生

代码在工作，过载消失了。但是我在spring容器中运行了测试，出于某种原因，我得到了这个错误

@RunWith(SpringRunner.class)
@SpringBootTest

如果你没有弹簧就跑，一切正常

htmlForm.<HtmlFileInput>getInputByName("filename").setValueAttribute(model);
htmlForm.<HtmlFileInput>getInputByName("filename").setContentType("multipart/form-data");
HtmlPage restore = htmlForm.getInputByName("Restore").click(); 

决定

@RunWith(SpringRunner.class)
@SpringBootTest

htmlForm.<HtmlFileInput>getInputByName("filename").setValueAttribute(model);
htmlForm.<HtmlFileInput>getInputByName("filename").setContentType("multipart/form-data");
HtmlPage restore = htmlForm.getInputByName("Restore").click(); 

        webClient.getOptions().setTimeout(20000);
        webClient.getOptions().setThrowExceptionOnScriptError(false);
        webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
        webClient.getOptions().setCssEnabled(false);
        webClient.getOptions().setJavaScriptEnabled(true);
        webClient.getOptions().setUseInsecureSSL(true);
        webClient.getOptions().setRedirectEnabled(true);