[SpringBoot] 파일 다운로드

VideoRestController.java

@GetMapping(value = "/{videoId}/download", produces = MediaType.APPLICATION_JSON_VALUE)
public StreamingResponseBody findVideoFileDownload(@PathVariable(name="videoId") String videoId,HttpServletResponse response) throws FileNotFoundException {

// TODO Auto-generated method stub
return this.videoServiceImpl.findVideoFileDownload(videoId, response);

}

VideoService.java

public interface VideoService {

    public StreamingResponseBody findVideoFileDownload(String videoId, HttpServletResponse response) throws FileNotFoundException;


}

VideoLogic.java

public class VideoLogic implements VideoService {

    private VideoRepositoryStore videoRepository;

    public VideoLogic(VideoRepositoryStore videoRepository) {
        this.videoRepository = videoRepository;
    }


    @SuppressWarnings("resource")
    @Override
    public StreamingResponseBody findVideoFileDownload(String videoId, HttpServletResponse response) throws FileNotFoundException {

        /*
         * 다운 받을 영상 경로 예 : /Users/kabby/Desktop/video/tea.mp4
         *
         * 확장자 : mp4
         * 
         */

        Video video=this.videoRepository.retrieveVideoById(videoId);

        response.setContentType("video/mp4");
        response.setHeader("Content-Disposition", "attachment;filename=" + video.getVideoName() + "." + video.getVideoExtention());

        File targetFile = new File(video.getVideoPath());
        InputStream targetStream =  new DataInputStream(new FileInputStream(targetFile));

        return outputStream -> {
            int nRead;
            byte[] data = new byte[4069];
            while ((nRead = targetStream.read(data, 0, data.length)) != -1) {
                outputStream.write(data, 0, nRead);
            }

        };
    }

}