如何在spring boot@responsebody-方法返回类型为response中返回404响应状态？

Question

我正在使用基于@ResponseBody的spring boot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，如：

res.setstatus(httpstatus.not_found.value())；
新建ResponseEntity(httpstatus.bad_request)；

但我需要回复。

如果视频为空，如何返回404状态码？

Answer 1

您可以在RE上设置responseStatus,如下所示：

@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
 ...
}

Answer 2

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 3

创建一个带有@ResponseStatus(HttpStatus.Not_Found)批注的NotFoundException类，并从您的控制器中抛出它。

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