SpringBoot 文件下载

最新推荐文章于 2025-11-04 14:02:51 发布

原创最新推荐文章于 2025-11-04 14:02:51 发布 · 124 阅读

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#spring boot #java #服务器

本文介绍了如何在SpringMVC中使用@Controller和@Service，通过@Autowired注入服务，实现文件下载功能。通过调用`downloadArticle`方法，从数据库获取文章内容，将其保存到硬盘并生成HTTP响应头以支持文件下载。

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);
}