如何使用Spring MVC返回视频，以便可以使用html5标记导航？

Question

视频文件与REST接口在同一个服务器上，REST接口只检查session并在发现应该发送哪个视频后发送视频。

这些是我到目前为止尝试过的方法。它们都工作，但没有一个允许导航。

/*
 * This will actually load the whole video file in a byte array in memory,
 * so it's not recommended.
 */
@RequestMapping(value = "/{id}/preview", method = RequestMethod.GET)
@ResponseBody public ResponseEntity<byte[]> getPreview1(@PathVariable("id") String id, HttpServletResponse response) {
    ResponseEntity<byte[]> result = null;
    try {
        String path = repositoryService.findVideoLocationById(id);
        Path path = Paths.get(pathString);
        byte[] image = Files.readAllBytes(path);

        response.setStatus(HttpStatus.OK.value());
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentLength(image.length);
        result = new ResponseEntity<byte[]>(image, headers, HttpStatus.OK);
    } catch (java.nio.file.NoSuchFileException e) {
        response.setStatus(HttpStatus.NOT_FOUND.value());
    } catch (Exception e) {
        response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
    }
    return result;
}

/*
 * IOUtils is available in Apache commons io
 */
@RequestMapping(value = "/{id}/preview2", method = RequestMethod.GET)
@ResponseBody public void getPreview2(@PathVariable("id") String id, HttpServletResponse response) {
    try {
        String path = repositoryService.findVideoLocationById(id);
        File file = new File(path)
        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        response.setHeader("Content-Disposition", "attachment; filename="+file.getName().replace(" ", "_"));
        InputStream iStream = new FileInputStream(file);
        IOUtils.copy(iStream, response.getOutputStream());
        response.flushBuffer();
    } catch (java.nio.file.NoSuchFileException e) {
        response.setStatus(HttpStatus.NOT_FOUND.value());
    } catch (Exception e) {
        response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
    }
}

@RequestMapping(value = "/{id}/preview3", method = RequestMethod.GET)
@ResponseBody public FileSystemResource getPreview3(@PathVariable("id") String id, HttpServletResponse response) {
    String path = repositoryService.findVideoLocationById(id);
    return new FileSystemResource(path);
}

Answer 1

处理非静态资源的简单解决方案：

@SpringBootApplication
public class DemoApplication {

    private final static File MP4_FILE = new File("/home/ego/bbb_sunflower_1080p_60fps_normal.mp4");

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Controller
    final static class MyController {

        @Autowired
        private MyResourceHttpRequestHandler handler;

        // supports byte-range requests
        @GetMapping("/")
        public void home(
                HttpServletRequest request,
                HttpServletResponse response
        ) throws ServletException, IOException {

            request.setAttribute(MyResourceHttpRequestHandler.ATTR_FILE, MP4_FILE);
            handler.handleRequest(request, response);
        }

        // does not support byte-range requests
        @GetMapping(path = "/plain", produces = "video/mp4")
        public FileSystemResource plain() {

            return new FileSystemResource(MP4_FILE);
        }
    }

    @Component
    final static class MyResourceHttpRequestHandler extends ResourceHttpRequestHandler {

        private final static String ATTR_FILE = MyResourceHttpRequestHandler.class.getName() + ".file";

        @Override
        protected Resource getResource(HttpServletRequest request) throws IOException {

            final File file = (File) request.getAttribute(ATTR_FILE);
            return new FileSystemResource(file);
        }
    }
}

（灵感来自Spring Boots，LogFileMvcEndpoint，与Paul-Warrens(@Paul-Warren)StoreByteRangeHttpRequestHandler，我后来发现了）差不多。

希望Spring在不久的将来能够支持这一点，请参见https://jira.Spring.io/browse/spr-13834（请投赞成票）。