Java优学网Spring注解短文：掌握@Component、@Service、@Aspect等核心注解，轻松实现依赖注入与AOP切面编程

@Component public class UserService {

// 业务逻辑代码

}

@Service public class UserService {

@Autowired
private UserRepository userRepository;

// 业务方法

}

@Aspect @Component public class LoggingAspect {

@Before("execution(* com.example.service.*.*(..))")
public void logMethodCall(JoinPoint joinPoint) {
    System.out.println("调用方法: " + joinPoint.getSignature().getName());
}

@AfterReturning(pointcut = "execution(* com.example.service.*.*(..))", returning = "result")
public void logMethodResult(JoinPoint joinPoint, Object result) {
    System.out.println("方法返回: " + result);
}

}