SpringMVC上传下载

@Controller
public class UploadController {
    @RequestMapping(value = "/upload",method = RequestMethod.POST)
    public @ResponseBody String upload(MultipartFile file, HttpServletRequest request){
        try {
            String path=request.getServletContext().getRealPath("/images/");
            String filename=file.getOriginalFilename();
            File filepath=new File(path,filename);
            if(!filepath.getParentFile().exists()){
                filepath.getParentFile().mkdirs();
            }
            System.out.println(path+File.separator+filename);
            FileUtils.writeByteArrayToFile(new File(path+File.separator+filename),file.getBytes());
            return "ok";
        } catch (Exception e) {
            e.printStackTrace();
            return "wrong";
        }
    }
    @RequestMapping(value="/download")
    public ResponseEntity<byte[]> download(HttpServletRequest request, @RequestParam("filename") String filename) throws Exception{
        //下载路径
        String path=request.getServletContext().getRealPath("/images/");
        File file=new File(path+File.separator+filename);
        HttpHeaders headers=new HttpHeaders();
        //下载显示文件名，解决中文名称乱码问题
        String downloadFileName=new String(filename.getBytes("UTF-8"),"iso-8859-1");
        //通知浏览器以attachment（下载方式)打开图片
        headers.setContentDispositionFormData("attachment",downloadFileName);
        //二进制流数据(最常见的文件下载)
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);
    }
}