英文:
Returning a string when the return type is an object in a REST service
问题
@GetMapping("/{Id}")public @ResponseBody User getUserPath(@PathVariable int Id) {User user = userRepository.findById(Id).orElse(null);if (user == null) {// return "Please provide a valid user ID";throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Please provide a valid user ID");}return user;}
英文:
I am creating a REST Service which returns user objects that can be filtered. I use @ResponseBody User when I return a user. But when the id doesn't exist, I want to display a String saying "Please provide a valid user ID". How do I do this when the return type is User?
code:
@GetMapping("/{Id}")public @ResponseBody User getUserPath(@PathVariable int Id) {User user = userRepository.findById(Id).get();if (user==null){//return "Please provide a valid user ID"}return user;}
Does somebody know how to do this?
答案1
得分: 0
简单地返回对象`public @ResponseBody Object getUserPath()`**更新 1**：在这种情况下，我认为更好的做法是抛出异常，使用 `@ControllerAdvice` + `@ExceptionHandler` 进行处理，并在那里返回错误字符串
英文:
simply return object
public @ResponseBody Object getUserPath()
update 1:
IMHO much better in this case is to throw exception, handle it with @ControllerAdvice + @ExceptionHandler and return error with string there
答案2
得分: 0
以下代码将完成您的工作。这将返回您的自定义字符串和正确的HTTP状态代码。
@GetMapping("/{Id}")public ResponseEntity<User> getUserPath(@RequestParam int Id) {User user = userRepository.findById(Id).get();if (user == null) {return new ResponseEntity("Please provide a valid user ID", HttpStatus.NOT_FOUND);}return new ResponseEntity<User>(user, HttpStatus.FOUND);}
英文:
Below code will do your job. This will return your custom string and the correct HTTP status code as well.
@GetMapping("/{Id}")public ResponseEntity<User> getUserPath(@RequestParam int Id) {User user = userRepository.findById(Id).get();if (user==null){return new ResponseEntity("Please provide a valid user ID", HttpStatus.NOT_FOUND);}return new ResponseEntity<User>(user, HttpStatus.FOUND);}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论