What is Spring AOP

Spring AOP is the abbreviation of "Aspect-Oriented Programming", which means aspect-oriented programming and is an important content in the Spring framework. Spring AOP is a powerful programming technology that can help developers better organize and maintain code, reduce coupling, and improve reusability and development efficiency. It is particularly suitable for applications with cross-cutting logic, such as performance monitoring, transaction management, security control and logging.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Spring AOP is the abbreviation of Aspect-Oriented Programming, which means aspect-oriented programming and is an important content in the Spring framework. It achieves unified maintenance of program functions through pre-compilation and runtime dynamic agents. It isolates various parts of the business logic, thereby reducing the coupling between the various parts of the business logic and improving the reusability of the program. At the same time, the efficiency of development is improved.

In Spring AOP, there are some important concepts that need to be understood. The first is the target object (target), which refers to the object to be enhanced, including the object of the main business logic class. The second is the join point (JoinPoint), which represents a clear point during program execution. The join point is determined by the method and indicates which target method is executed. Then there is the proxy object. Spring will generate a proxy object for the target object through a proxy. Some enhanced functions will be added to the proxy object to indirectly enhance the target object through the proxy object.

In addition, there are two concepts: advice and pointcut. Notifications refer to the functions that need to be enhanced in the target object, and what operations are performed where in the method; the entry point is used to specify where the notification needs to be used, such as which methods in which classes. Finally, there is the aspect, which consists of advice and pointcuts to define what operations are performed where.

The emergence of Spring AOP is not to replace object-oriented programming (OOP), but as a useful supplement to OOP. It is only suitable for applications with cross-cutting logic, such as performance monitoring, access control, transaction management, and logging. By using Spring AOP, you can reduce code complexity, improve development efficiency, and facilitate maintenance.

In actual use, developers can specify the methods and notification logic that need to be enhanced by defining Aspect. Spring will automatically scan and register classes and methods annotated with @Aspect, and then enhance the functionality of the target method based on the defined pointcut expressions and advice.

It should be noted that Spring AOP only supports method type connection points, so you need to specify the target method when defining the pointcut. At the same time, there are also restrictions on the types of notifications, such as pre-notification (Before), post-notification (After), return notification (AfterReturning), exception notification (AfterThrowing), and surround notification (Around). Developers can choose the appropriate notification type based on actual needs.

In addition, Spring AOP also provides powerful aspect support, including default aspects, surround notification aspects, exception throwing aspects, etc. These aspects can help developers better organize and manage enhanced logic and improve the maintainability and readability of the code.

In general, Spring AOP is a powerful programming technology that can help developers better organize and maintain code, reduce coupling, and improve reusability and development efficiency. It is particularly suitable for applications with cross-cutting logic, such as performance monitoring, transaction management, security control and logging. By using Spring AOP, developers can better cope with complex software requirements and architectural challenges, and improve the quality and stability of software.

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