如何在thymeleaf中使用HTML5的下载属性？

Question

有没有办法在百万富翁中使用下载 attrribute，因为我无法通过html5下载文件。我试图从后端下载文件，它工作正常，但无法通过前端这样做。任何建议都会有所帮助......

  <td th:switch="${xraydata.xrayResult}">
       <span th:case="2"><a  href="" th:href="@{/download/csv}">Abnormal but eligible for sputum</a></span>
       <span th:case="1"><a th:href="${path}" target="_blank" th:attr="download">Normal</a></span>
       <span th:case="3"><a  th:href="@{/download/csv}" download>Abnormal but uneligible for sputum</a></span>
  </td>

我在后端尝试了 th：case =“3”的代码：

 @RequestMapping(value="/download/csv",method=RequestMethod.GET)
    public void downloadFile(HttpServletResponse response) throws IOException {
    System.out.println("the participants id is");
    String FILE_PATH="C:/java/020.dcm";
    final String APPLICATION_PDF = "020/dcm";
    File file = getFile(FILE_PATH);
    InputStream in = new FileInputStream(file);
    response.setContentType(APPLICATION_PDF);
    response.setHeader("Content-Disposition", "attachment; filename=" + 
    file.getName());
    response.setHeader("Content-Length", String.valueOf(file.length()));
    FileCopyUtils.copy(in, response.getOutputStream());

}