How to use AOP in SpringBoot?

In SpringBoot, you can implement AOP (Aspect-Oriented Programming) by following these steps:

1. Create an aspect class that contains the logic to be executed before or after method execution, such as logging, performance monitoring, etc.

@Aspect
@Component
public class LoggingAspect {

    @Before("execution(* com.example.demo.service.*.*(..))")
    public void logBefore(JoinPoint joinPoint) {
        System.out.println("Method executed: " + joinPoint.getSignature().getName());
    }

    @After("execution(* com.example.demo.service.*.*(..))")
    public void logAfter(JoinPoint joinPoint) {
        System.out.println("Method execution completed: " + joinPoint.getSignature().getName());
    }
}

1. Add the @EnableAspectJAutoProxy annotation to the main application class in Spring Boot to enable AOP functionality.

@SpringBootApplication
@EnableAspectJAutoProxy
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

1. Add annotations such as @Before or @After to the classes or methods where AOP is needed, specifying the pointcut expression.

@Service
public class UserService {

    public void addUser(String username) {
        System.out.println("User added: " + username);
    }

    public void deleteUser(String username) {
        System.out.println("User deleted: " + username);
    }
}

By following the above steps, you can enhance and control methods in a SpringBoot application using AOP. In practical applications, different aspect classes and pointcut expressions can be defined according to specific requirements to achieve more complex business logic control.