Java 如何在 Spring Boot @ResponseBody 中返回 404 响应状态 - 方法返回类型是 Response？
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How to return 404 response status in Spring Boot @ResponseBody - method return type is Response?
提问by nazar_art
I'm using Spring Boot with @ResponseBody based approach like the following:
我将 Spring Boot 与基于 @ResponseBody 的方法一起使用，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());
}
I tried some typical approaches as:
我尝试了一些典型的方法：
res.setStatus(HttpStatus.NOT_FOUND.value());
new ResponseEntity(HttpStatus.BAD_REQUEST);
res.setStatus(HttpStatus.NOT_FOUND.value());
新的响应实体（HttpStatus.BAD_REQUEST）；
but I need to return Response.
但我需要返回Response。
How to return here 404 status code if video is null?
如果视频为空，如何在此处返回 404 状态代码？
采纳答案by chrylis -cautiouslyoptimistic-
Create a NotFoundExceptionclass with an @ResponseStatus(HttpStatus.NOT_FOUND)annotation and throw it from your controller.
创建一个NotFoundException带有@ResponseStatus(HttpStatus.NOT_FOUND)注释的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 {
}
回答by amazia
Your original method can return ResponseEntity(doesn't change your method behavior):
您的原始方法可以返回ResponseEntity（不会改变您的方法行为）：
@RequestMapping(value = VIDEO_DATA_PATH, method = RequestMethod.GET)
public ResponseEntity getData(@PathVariable(ID_PARAMETER) long id, HttpServletResponse res{
...
}
and return the following:
并返回以下内容：
return new ResponseEntity(HttpStatus.NOT_FOUND);
回答by Micha?
You can just set responseStatus on res like this:
您可以像这样在 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
...
}
回答by andrej
This is very simply done by throwing org.springframework.web.server.ResponseStatusException:
这是通过抛出org.springframework.web.server.ResponseStatusException非常简单地完成的：
throw new ResponseStatusException(
HttpStatus.NOT_FOUND, "entity not found"
);
It's compatible with @ResponseBody and with any return value. Requires Spring 5+
它与@ResponseBody 和任何返回值兼容。需要春天 5+
