spring-boot 中的 @ControllerAdvice 注释是什么，我们为什么以及何时使用它？

Question

我在基于 spring-boot 框架的工作中使用自定义框架，当我需要它来创建自定义异常处理程序类时，我在 spring-boot 中看到这个注释@ControllerAdvice但我不知道为什么我必须使用它？

Answer 1

@ ControllerAdvice is very useful to handle exceptions when you have multiple REST API controllers doing a lot of different work.

That means when writing any application you encounter exceptions and to handle them at each method level is tedious and not optimal. So in order to overcome that, spring has introduced the concept of @ControllerAdvice which will intercept all the controllers and look for the exceptions thrown. This is at a global level means you only have one @ControllerAdvice for each application and it will intercept the exceptions thrown by the controllers in that particular application context. For more information here is a nice explanation:

Note : It should be used only with spring MVC controllers.