SpringMVC实现文件上传下载

本是古典何须时尚 2022-06-07 13:05 355阅读 0赞

/* * 保存及更新数据 */
        @RequestMapping(value = "/save", method = RequestMethod.POST)
        public String save(Model model, Check check, MultipartFile file) throws IllegalStateException, IOException {
            String path = "E:/upload";
            System.out.println(path);
            if (!file.isEmpty()) {
                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 设置日期格式
                check.setUploadtime(df.format(new Date()));
                String fileName = file.getOriginalFilename();
                String fileSize = (file.getSize() / 1024 + 1) + "KB";
                check.setFilename(fileName);
                check.setFilesize(fileSize);
                check.setFileSavePath(path + "/" + fileName);
                File dir = new File(path, fileName);
                // MultipartFile自带的解析方法
                file.transferTo(dir);
            }
            checkService.updateById(check);
            return "redirect:/api/check";
        }
    
        /* * 文件下载 * */
        @RequestMapping(value="/download/{filename:.+}")
        public String download(HttpServletRequest request,HttpServletResponse response,@PathVariable String filename) throws IOException{
            System.out.println(filename);
            String path = "E:/upload/"+filename;  
            System.out.println(path);
            //获取输入流 
            InputStream bis = new BufferedInputStream(new FileInputStream(new File(path)));  
            //假如以中文名下载的话 
            //转码，免得文件名中文乱码 
            filename = URLEncoder.encode(filename,"UTF-8");  
            //设置文件下载头 
            response.addHeader("Content-Disposition", "attachment;filename="+filename);    
            //1.设置文件ContentType类型，这样设置，会自动判断下载文件类型 
            response.setContentType("multipart/form-data");   
            BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());  
            int len = 0;  
            while((len = bis.read()) != -1){  
                out.write(len);  
                out.flush();  
            }  
            out.close(); 
            return null;
        }