java - Spring aop中@Before @After和@AfterExecution有什么区别

Question

我已经开始学习 Spring AOP。

我能简单描述一下@Before @After 和@AfterExecution吗

这三个注释与@Before 和@After 混淆了，因为它们都在方法执行开始之前执行。

我能对@Before 和@After 有一些建议吗？

提前致谢。

Answer 1

This是一个很好的网站，解释了 Spring AOP，特别是这一部分；

AOP Advice Types

Based on the execution strategy of advices, they are of following types.

• Before Advice: These advices runs before the execution of join point methods. We can use @Before annotation to mark an advice type as Before advice.
• After (finally) Advice: An advice that gets executed after the join point method finishes executing, whether normally or by throwing an exception. We can create after advice using @After annotation.
• After Returning Advice: Sometimes we want advice methods to execute only if the join point method executes normally. We can use @AfterReturning annotation to mark a method as after returning advice.
• After Throwing Advice: This advice gets executed only when join point method throws exception, we can use it to rollback the transaction declaratively. We use @AfterThrowing annotation for this type of advice.
• Around Advice: This is the most important and powerful advice. This advice surrounds the join point method and we can also choose whether to execute the join point method or not. We can write advice code that gets executed before and after the execution of the join point method. It is the responsibility of around advice to invoke the join point method and return values if the method is returning something. We use @Around annotation to create around advice methods.