SpringBoot 文件下载

• controller
• service

实例代码：

• controller @Controller @RequestMapping("download") public class FileDownloadController {

      @Autowired
      FileDownloadService fileDownloadService;
  
      @GetMapping("article/{id}")
      public ResponseEntity<byte[]> downloadArticle(@PathVariable String id) {
          ResponseEntity<byte[]> result = fileDownloadService.downloadArticle(id);
          return result;
      }
  }
  

• service public ResponseEntity<byte[]> downloadArticle(String articleId) { Article article = articleService.get(articleId); byte[] data = null; // 将 article 保存到硬盘 File file = fileDownloadService.saveArticleInDisk(article.getTitle() , article.getContent()); try { data = FileUtil.toByteArray(file.getAbsolutePath()); } catch (IOException e) { e.printStackTrace(); } String fileName = file.getName() ; HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); try { headers.setContentDispositionFormData("attachment", URLEncoder.encode(fileName,"utf-8")); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new ResponseEntity<byte[]>( data , headers , HttpStatus.CREATED); }