我是 Spring 季和 Spring 季靴子的新手 . 在创建一个简单的REST API以对用户执行CRUD操作之后，我还创建了自定义异常处理程序来捕获应用程序中发生的任何异常 . 这是我写的代码
控制器类
public class UserController {
@Autowired
private IUserService userService;
@ApiOperation(value = "View list of all users", response = Iterable.class)
@RequestMapping(value = "/users", method = RequestMethod.GET)
public @ResponseBody List<User> getAll() throws EntityNotFoundException {
return userService.query();
}
@ApiOperation(value = "View a specific user", response = User.class)
@RequestMapping(value = "/users/{id}", method = RequestMethod.GET, produces = { MediaType.APPLICATION_JSON_VALUE })
public @ResponseBody List<User> getUser(@PathVariable(value = "id") String userid) throws EntityNotFoundException {
return userService.query(userid);
}
@ApiOperation(value = "create a user")
@RequestMapping(value = "/users", method = RequestMethod.POST, produces = { MediaType.APPLICATION_JSON_VALUE })
public ResponseEntity<HttpStatus> createUser(@Valid @RequestBody User user) throws Exception {
userService.add(user);
return ResponseEntity.ok(HttpStatus.OK);
}
@ApiOperation(value = "update a user")
@RequestMapping(value = "/users", method = RequestMethod.PUT, produces = { MediaType.APPLICATION_JSON_VALUE })
public ResponseEntity<User> updateUser(@Valid @RequestBody User entity) throws Exception {
User user = userService.update(entity);
if (user == null) {
return ResponseEntity.notFound().build();
}
return ResponseEntity.ok(user);
}
@ApiOperation(value = "delete a user")
@RequestMapping(value = "/userid/{id}", method = RequestMethod.DELETE, produces = {
MediaType.APPLICATION_JSON_VALUE })
public ResponseEntity<HttpStatus> deleteUser(@PathVariable(value = "id") String userid) throws Exception {
String result = userService.remove(userid);
if (result.equals(null)) {
return ResponseEntity.notFound().build();
}
return ResponseEntity.ok(HttpStatus.OK);
}
}
异常处理程序使用@Controlleradvice注释类
@Order(Ordered.HIGHEST_PRECEDENCE)
@ControllerAdvice
public class RestExceptionHandler extends ResponseEntityExceptionHandler {
/**
* Handles javax.validation.ConstraintViolationException. Thrown
* when @Validated fails.
*
* @param ex
* the ConstraintViolationException
* @return the ApiError object
*/
@ExceptionHandler(javax.validation.ConstraintViolationException.class)
protected ResponseEntity<Object> handleConstraintViolation(javax.validation.ConstraintViolationException ex) {
ApiError apiError = new ApiError(BAD_REQUEST);
apiError.setMessage("Validation error");
return buildResponseEntity(apiError);
}
/**
* Handles EntityNotFoundException. Created to encapsulate errors with more
* detail than javax.persistence.EntityNotFoundException.
*
* @param ex
* the EntityNotFoundException
* @return the ApiError object
*/
@ExceptionHandler(EntityNotFoundException.class)
protected ResponseEntity<Object> handleEntityNotFound(EntityNotFoundException ex) {
ApiError apiError = new ApiError(NOT_FOUND);
apiError.setMessage(ex.getMessage());
return buildResponseEntity(apiError);
}
/**
* Handle Exception, handle generic Exception.class
*
* @param ex
* the Exception
* @return the ApiError object
*/
@ExceptionHandler(MethodArgumentTypeMismatchException.class)
protected ResponseEntity<Object> handleMethodArgumentTypeMismatch(MethodArgumentTypeMismatchException ex,
WebRequest request) {
ApiError apiError = new ApiError(BAD_REQUEST);
apiError.setMessage(String.format("The parameter '%s' of value '%s' could not be converted to type '%s'",
ex.getName(), ex.getValue(), ex.getRequiredType().getSimpleName()));
apiError.setDebugMessage(ex.getMessage());
return buildResponseEntity(apiError);
}
private ResponseEntity<Object> buildResponseEntity(ApiError apiError) {
return new ResponseEntity<>(apiError, apiError.getStatus());
}
}
但是，当发生任何异常时，应用程序将重定向到/ error页面，而不是由异常处理程序类处理 . 任何人都可以就正确的方法提出建议 .
1 回答
处理程序没有捕获哪些异常？是ConstraintViolationExceptions吗？
当你这样做时：
您正在该方法中触发验证，因此如果未满足用于装饰您的User类的约束，则将抛出 MethodArgumentNotValidException ，而不是 ConstraintViolationException .
当你扩展 ResponseEntityExceptionHandler 时，你应该检查这个类的代码，它定义了以下方法：
因此，MethodArgumentNotValidException已在此处捕获，并且此类异常的处理将传递给handleMethodArgumentNotValid方法 .
默认 handleMethodArgumentNotValid 只需致电：
这里更好的选择是覆盖 RestExceptionHandler 中的 handleMethodArgumentNotValid