Spring MVC之ResposeEntity下載文件

Spring Mvc中用ResponseEntity方式下載文件如下：

@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();
        //下載顯示的中文名，解決中文名稱亂碼問題
        String downloadFileName = new String(fileName.getBytes("UTF-8"),"ISO-8859-1");
        //application/octet-stream:二進制流數據
        headers.setContentDispositionFormData("attachment",downloadFileName);
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(dwFile),headers, HttpStatus.CREATED);
    }
}