文件的上传和下载

@RequestMapping("/uploadFile") ???public String upload(@RequestParam(value="file") MultipartFile file, ???????????HttpServletRequest request) throws IllegalStateException, IOException{ ???????//如果文件不为空，写入上传路径 ???????if(!file.isEmpty()) { ???????????//上传文件绝对路径 ???????????String path = request.getServletContext().getRealPath("/images/"); ???????????//上传文件名 ???????????String filename = file.getOriginalFilename(); ???????????File filepath = new File(path,filename); ???????????//判断路径是否存在，如果不存在就创建一个 ???????????if (!filepath.getParentFile().exists()) { ????????????????filepath.getParentFile().mkdirs(); ???????????} ???????????//将上传文件保存到一个目标文件当中 ???????????file.transferTo(new File(path + File.separator + filename)); ???????????String showPath = request.getContextPath()+"/images/"+filename; ???????????????????????request.setAttribute("showPath", showPath); ???????????return "hello"; ???????} else { ???????????return "error"; ???????} ???????????????????????????????????????????}