Question

我是Spring MVC的新手，虽然不是Java的新手。我正在尝试上传和下载数据库中的数据。我在网站上做了类似的事情：file-upload-and-download-using-spring-mvc。

上传文件成功但是当我想下载文件时，下载成功但文件已损坏。为什么会这样？以及如何解决它？

这是我的下载控制器..

@RequestMapping(value = "/listeContenuDownload.id", method = RequestMethod.GET)
    public ModelAndView responseEachReportDownload(ModelMap model, HttpServletRequest request, HttpSession session, @ModelAttribute("uploadForm") FileUploadForm uploadForm, Model map, HttpServletResponse response) throws IOException, ServletRequestBindingException, SQLException {

String tiket = request.getParameter("idTiket");
complaintdata cd = new GoIndex().getCheckStatusReport(tiket);
String nameFileReport = cd.getNameFileReport();
String extFileReport = cd.getExtFileReport();
byte[] file = cd.getFile();

response.setContentType(extFileReport);
response.setContentLength(file.length);
response.setHeader("Content-Disposition","attachment; filename=\"" + nameFileReport +"\"");

FileCopyUtils.copy(file, response.getOutputStream());

 return null;
   }

这是我在HTML-JSP中的下载表单：

<div class="form-group">
    <label class="col-md-3 control-label" for="message">File : </label>
    <div class="col-md-9">
        <a href="listeContenuDownload.id?idTiket=<c:out value="${ticket}"/>">${nameFileReport}</a>
    </div>
 </div>

这是上传控制器：

@RequestMapping(value = "/getTicketting.id", method = RequestMethod.POST)
    public String userDataSubmit(ModelMap model, HttpServletRequest request, HttpSession session, @ModelAttribute("uploadForm") FileUploadForm uploadForm,
            Model map) throws SQLException, FileNotFoundException, FileUploadException, IOException, ServletException {

MultipartFile multipartFile = uploadForm.getFile();

            String fileName = "";
            String fileExt = "";
            byte[] file123 = null;

            if (multipartFile != null) {
                fileName = multipartFile.getOriginalFilename();    
                fileExt = multipartFile.getContentType();          
                file123 = multipartFile.getBytes();                 
            }

String urf = new GoIndex().getUpdateComplaintData(ticket, subject, data, file, fileName, fileExt, file123);

return "buatAduanTicket";
        }

这是我在HTML-JSP中的上传表单：

    <form class="form-horizontal" action="getTicketting.id" method="post" modelAttribute="uploadForm" enctype="multipart/form-data"> 
 <div class="clearfix">
    <label for="fileData"><span><b>Upload the File :</b></span></label>
    <div class="input">
        <input type="file" title="AddFile" name="file" id="file">
    </div>
  </div>
 </form>

我对腐败的意思是，例如当我下载图像文件时，它会显示：＆＃34;无法打开此图片，因为该文件似乎已损坏，损坏或太大而且＃34;或者pdf文件类似于：＆＃34;无法加载pdf＆＃34;文档＆＃34;。 ps：下载成功但无法打开下载文件。

非常感谢您的帮助。

使用Spring（mvc）上传和下载文件

0 个答案: