如何在Spring Boot中返回404响应状态@ResponseBody -方法返回类型是response

Question

我正在使用Spring Boot与基于@ResponseBody的方法，如下所示:

@RequestMapping(value = VIDEO_DATA_PATH, method = RequestMethod.GET)
public @ResponseBody Response getData(@PathVariable(ID_PARAMETER) long id, HttpServletResponse res) {
    Video video = null;
    Response response = null;
    video = videos.get(id - 1);
    if (video == null) {
      // TODO how to return 404 status
    }
    serveSomeVideo(video, res);
    VideoSvcApi client =  new RestAdapter.Builder()
            .setEndpoint("http://localhost:8080").build().create(VideoSvcApi.class);
    response = client.getData(video.getId());
    return response;
}
public void serveSomeVideo(Video v, HttpServletResponse response) throws IOException  {
    if (videoDataMgr == null) {
        videoDataMgr = VideoFileManager.get();
    }
    response.addHeader("Content-Type", v.getContentType());
    videoDataMgr.copyVideoData(v, response.getOutputStream());
    response.setStatus(200);
    response.addHeader("Content-Type", v.getContentType());
}

我尝试了一些典型的方法:

res.setStatus (HttpStatus.NOT_FOUND.value ());
新ResponseEntity (HttpStatus.BAD_REQUEST);

但是我需要返回Response

如果视频为空，如何返回这里404状态码?

Answer 1

只需抛出 org.springframework.web.server.ResponseStatusException :

throw new ResponseStatusException(
  HttpStatus.NOT_FOUND, "entity not found"
);

它兼容@ResponseBody和任何返回值。要求Spring 5+

Answer 2

创建带有@ResponseStatus(HttpStatus.NOT_FOUND)注释的NotFoundException类并将其从控制器中抛出。

@ResponseStatus(code = HttpStatus.NOT_FOUND, reason = "video not found")
public class VideoNotFoundException extends RuntimeException {
}

Answer 3

您的原始方法可以返回 ResponseEntity (不改变您的方法行为):

@RequestMapping(value = VIDEO_DATA_PATH, method = RequestMethod.GET)
public ResponseEntity getData(@PathVariable(ID_PARAMETER) long id, HttpServletResponse res{
... 
}

并返回以下内容:

return new ResponseEntity(HttpStatus.NOT_FOUND);

Answer 4

你可以像这样在res上设置responseStatus:

@RequestMapping(value = VIDEO_DATA_PATH, method = RequestMethod.GET)
public ResponseEntity getData(@PathVariable(ID_PARAMETER) long id,
                                            HttpServletResponse res) {
...
    res.setStatus(HttpServletResponse.SC_NOT_FOUND); 
    // or res.setStatus(404)
    return null; // or build some response entity
 ...
}