How to get the parameters of the target method:
Requirements: If you want to get the parameters of the target method and record them.
Get the target object:
target(t) The purpose of target is to get the target object
Get the annotation on the get method:
Requirement: How to get annotations on methods through pointcut expressions
Aspect annotation
1- Turn on Aspect Annotation
2- Define the aspect - @Aspect
3. Define the entry point - two ways
1. Empty method
*1* Create an empty method in the aspect and annotate it with @Pointcut(value=" pointcut expression ")
@Pointcut(value=" pointcut expression ")
@Pointcut(value="pointcut expression")
public void poincut(){}//empty method
*2* Bind the pointcut in the advice annotation:
@Before(value="poincut() pointcut empty method name ")
2. Define inside the notification
@Before(value="execution() match expression ")
Note: This method is relatively simple, so that the pointcut only acts on this method
4. Define Notifications
@Before // before
@Around // Around
@AfterReturning // After
@AfterThrowing // Exception
@After // final
5. Get the parameters of the target method in the annotation
Note: If you want to get parameters in the configuration file, you must add and, in the annotation, if you want to get parameters, you must add &&
1- Get parameters by empty method:
2- Define inside the notification
Note: In addition to special reasons, it is recommended to use the internal definition method, which is also used the most.
6. Post notification return value problem:
7. Exception notification return value problem
