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Editor to share with you how to use java to achieve file upload, download, picture preview functions, I believe that most people do not understand, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Save multiple files locally:

@ ResponseBody @ RequestMapping (value = "/ uploadApp", produces = {"application/json;charset=UTF-8"}, method= RequestMethod.POST) public String uploadApp (HttpServletRequest request,@RequestParam ("file") MultipartFile [] file) throws IOException {try {if (file.length > 0) {String name = file [0] .getOriginalFilename (). Split (";") [0]; String fileUrlName = CommonEnum.FILEPATH+ "/" + name; for (int I = 0; I

< file.length; i++) { FileUtils.copyInputStreamToFile(file[i].getInputStream(), new File(fileUrlName, file[i].getOriginalFilename().split(";")[1])); } return "success"; }else{ return "null"; } }catch (Exception e){ e.printStackTrace(); return "error"; } } 下载文件： @RequestMapping(value = "/download", method = RequestMethod.GET) @ResponseBody public void download(@RequestParam Map data, HttpServletRequest request,HttpServletResponse response) throws FileNotFoundException { String time = DateUtil.formatFromDate("yyyyMMddHHmmss", new Date()); List urllist = companyService.findByIMG(data); String path = (String) urllist.get(0).get("imgurl"); String docx = StringUtils.substringAfterLast(path, "."); String fileName = time+"."+docx; // 文件的默认保存名 InputStream inStream = new FileInputStream(path);// 文件的存放路径 response.reset(); response.setContentType("bin"); response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); byte[] b = new byte[100]; int len; try { while ((len = inStream.read(b)) >

0) response.getOutputStream (). Write (b, 0, len); inStream.close ();} catch (IOException e) {e.printStackTrace ();}} / * * read pictures * / @ RequestMapping (value = "/ iomoreimgcom", produces = {"application/json;charset=UTF-8"}, method = RequestMethod.GET) @ ResponseBody public synchronized void iomoreimgcom (HttpServletRequest request, HttpServletResponse response) throws Exception {String url = request.getParameter ("url"); File file = new File (url) BufferedInputStream bis = new BufferedInputStream (new FileInputStream (file)); BufferedOutputStream bos = new BufferedOutputStream (response.getOutputStream ()); response.setHeader ("Content-Type", "image/jpeg"); byte b [] = new byte [1024]; int read; try {while ((read = bis.read (b))! =-1) {bos.write (b, 0, read);} / / request.getRequestDispatcher ("/ components/hazard/yscchird.html") .forward (request, response) } catch (Exception e) {/ / TODO: handle exception} finally {if (bos! = null) {bos.close ();} if (bis! = null) {bis.close ();}

The frontend request is to stitch the image path directly.

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