web 文件上传

服务端代码  ： 

@Controller
@RequestMapping("/file")
public class FileController {

    @PostMapping("/upload")
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
        if (!file.isEmpty()) {
            long l = System.currentTimeMillis();
            Date date = new Date(l);
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss_");
            String prefix = dateFormat.format(date);
            String saveFileName = prefix + file.getOriginalFilename();
            File saveFile = new File(request.getSession().getServletContext().getRealPath("/upload/") +"/" +saveFileName);
            if (!saveFile.getParentFile().exists()) {
                saveFile.getParentFile().mkdirs();
            }
            try {
                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(saveFile));
                out.write(file.getBytes());
                out.flush();
                out.close();
                return "success";
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return "failure";
            } catch (IOException e) {
                e.printStackTrace();
                return "failure";
            }
        } else {
            return "failure";
        }
    }

}

 转载自：https://blog.csdn.net/xxkalychen/article/details/77842638