上载多个文件，enctype=“多部分/表单-数据”

Question

我想上传多个文件到控制器，但它只需要一个。

我正在使用多部分文件传输。如何将多个文件送到控制器端。我无法访问字节和文件名。它的投掷错误，

@RequestMapping(value = "/home/step38/uploadReport", method = RequestMethod.POST)
public ModelAndView uploadReport(                 
         @RequestParam(value = "fileName") List<MultipartFile> files,
         @RequestParam(value = "pLogId") String pLogId,
          HttpServletRequest request, HttpSession session) 
{ 
    int applicationNameId = 0;
   String fileName;
    String typeOption = "Raw Particle Data";
    for(MultipartFile file:files)      
     fileName = file.getOriginalFilename();

    logger.debug("step3.1 upload particle count -- Start");

    ModelAndView modelAndView = createModelAndView(ToogleStep.step38);
    setCurrentStep(session, modelAndView, ToogleStep.step38);
    String view = "redirect:/home/step38";
    modelAndView.setViewName(view);   

    try 
    {
        User user = (User) session.getAttribute(Constants.USER_DB);
        Project current_project = (Project) session.getAttribute(Constants.PROJECT);
        Credential credential = (Credential) session.getAttribute(Constants.AUTH_USER);            
        boolean checkOK = true;        

        if (current_project != null && SystemUtils.projectEditable(current_project, credential)) 
        {
            long projectId = current_project.getId();

            if(checkOK)
            {
               byte[] bytes = file.getBytes();      
                HashMap<String,String> options= new HashMap<String,String>();
               //added pLogId in the options(this will contain demoToogleFileInfoId)           
                options.put(ToogleReportDataConstants.TTL_PROCESS_LOG_ID_OPTION,pLogId);
                String toogleFileId = reportService.uploadReport(user, projectId, fileName, typeOption, bytes, applicationNameId, options);

            }
        }         
    }

Answer 1

你没有在正确的位置循环通过。在你有你的modelAndView(视图)之后尝试循环它

 int applicationNameId = 0;
        String typeOption = "Raw Particle Data";
        ModelAndView modelAndView = createModelAndView(ToogleStep.step38);
        setCurrentStep(session, modelAndView, ToogleStep.step38);
        String view = "redirect:/home/step38";
        modelAndView.setViewName(view);   

        // upload multiple files.       
          for(MultipartFile file:files){   
            String fileName= file.getOriginalFilename();

然后您将能够访问字节和文件名。试试看。至少，看看你的问题，我可以建议，如果你能给出更具体的错误，我可以帮助。