@ControllerAdvice

用来将带有@ExceptionHandler, @InitBinder, or @ModelAttribute 方法应用到所有@Controller类或其子集

Specialization of @Component for classes that declare @ExceptionHandler, @InitBinder, or @ModelAttribute methods to be shared across multiple @Controller classes.

Classes with @ControllerAdvice can be declared explicitly as Spring beans or auto-detected via classpath scanning. All such beans are sorted via AnnotationAwareOrderComparator, i.e. based on @Order and Ordered, and applied in that order at runtime. For handling exceptions the first @ExceptionHandler to match the exception is used. For model attributes and InitBinder initialization, @ModelAttribute and @InitBinder methods will also follow @ControllerAdvice order.

By default the methods in an @ControllerAdvice apply globally to all Controllers. Use selectors annotations(), basePackageClasses(), and basePackages() (or its alias value()) to define a more narrow subset of targeted Controllers. If multiple selectors are declared, OR logic is applied, meaning selected Controllers should match at least one selector. Note that selector checks are performed at runtime and so adding many selectors may negatively impact performance and add complexity.