@RequestMapping("/download")

public ResponseEntity<byte[]> download(HttpServletRequest request,@RequestParam("fileName") String fileName) throws IOException {

        String path = request.getServletContext().getRealPath("/uploadImages/");

        File dwFile = new File(path+File.separator+fileName);

        HttpHeaders headers = new HttpHeaders();

        //下载显示的中文名，解决中文名称乱码问题

        String downloadFileName = new String(fileName.getBytes("UTF-8"),"ISO-8859-1");

        //application/octet-stream:二进制流数据

        headers.setContentDispositionFormData("attachment",downloadFileName);

        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(dwFile),headers, HttpStatus.CREATED);

    }

}