@Pointcut in Spring Boot is part of the AspectJ framework and is used to define pointcuts (Pointcut). A pointcut is a specific set of methods defined in an application. When these methods are executed, AOP (Aspect-Oriented Programming) notifications (Advices) will be triggered. The @Pointcut annotation allows you to declare these pointcut expressions so that AspectJ can recognize methods based on these expressions and apply advice when appropriate.
In this article, we will explain in detail how to use Spring Boot's @Pointcut annotation, provide a complete sample code, and analyze the running results. Finally, we summarize the concepts involved.
Part 1: Introduction to @Pointcut annotation
AspectJ is a powerful AOP framework, and Spring Boot integrates AspectJ to implement aspect-oriented programming. The @Pointcut annotation is part of AspectJ and is used to define pointcut expressions in order to identify target methods. A pointcut expression is a rule used to match a specific method, and when the method satisfies these rules, the corresponding notification will be triggered.
Usually, the @Pointcut annotation is used in conjunction with the @Aspect annotation. The @Aspect annotation represents an aspect class in which pointcuts and advice are defined.
Part 2: Detailed explanation of @Pointcut annotation
@Pointcut annotation can be used at method level or class level. When used at the method level, it can be used to define a concrete pointcut expression, or at the class level to reuse the same pointcut expression across multiple advices.
The syntax of pointcut expressions is very flexible and can be defined using different wildcards, operators, and keywords as needed. Here are some commonly used pointcut expression rules:
- execu