Question

以下是用于下载文件的控制器。这些文件可以是多种类型，例如pdf，excel和doc。问题是下载的文件类型始终是“文件”而不是pdf，excel或doc。我必须手动选择一个应用程序来打开该文件。有谁知道什么是错的？谢谢！

@RequestMapping(value="/download/system-of-record", method = RequestMethod.GET)
public void systemOfRecordDownload(HttpServletRequest request, HttpServletResponse response, HttpSession session) throws IOException {
    int formId = Integer.parseInt(request.getParameter("id"));
    Form form = formService.findFormByPrimaryKey(formId);
    String formName = form.getName();
    String formPath = form.getInternalLink();
    response.reset();
    response.setContentType("application/octet-stream");
    response.setHeader("Content-Disposition", "attachment; filename=\"" + formName + "\"");

    try {
        File f = new File(formPath);
        OutputStream os = response.getOutputStream();
        byte[] buf = new byte[8192];

        FileInputStream is = new FileInputStream(f);

        int readByte = 0;

        while ((readByte = is.read(buf, 0, buf.length)) > 0) {
            os.write(buf, 0, readByte);
            os.flush();
        }
        os.close();
        is.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Answer 1

这是因为您已将mime类型设置为octet-stream

使用Files.probeContentType(path)获取文件对象的正确mime类型并将其替换为octet-stream

或者使用您自己的逻辑从this list

指定mime类型

来自服务器的Java下载文件无法识别文件类型

1 个答案: